SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                              --------------------

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



Date of Report (Date of earliest event reported):   March 19, 2002


                             ASPEN TECHNOLOGY, INC.
             (Exact name of registrant as specified in its charter)

          DELAWARE                        0-24786               04-2739697
- --------------------------------------------------------------------------------
(State or other jurisdiction of        (Commission            (I.R.S. Employer
incorporation or organization)         File Number)          Identification No.)


                 Ten Canal Park, Cambridge, Massachusetts 02141
                    -----------------------------------------
              (Address of principal executive office and zip code)


                                 (617) 949-1000

                                 --------------

              (Registrant's telephone number, including area code)

                                 --------------



ITEM 5.  OTHER EVENTS

A.       ISSUANCE OF PREFERRED STOCK AND WARRANTS

         On February 6, 2002, we issued and sold 30,000 shares of our Series B-1
convertible preferred stock and warrants to purchase 365,854 shares of common
stock for an aggregate purchase price of $30.0 million. On February 28, 2002, we
issued and sold 20,000 shares of our Series B-2 convertible preferred stock and
warrants to purchase 283,460 shares of common stock for an aggregate purchase
price of $20.0 million. The Series B-1 preferred and Series B-2 preferred and
warrants were issued in private placements to three institutional investors.
These issuances were the subject of earlier reports on Form 8-K that we filed on
February 12, 2002 and March 5, 2002.

         On March 19, 2002, we issued 30,000 outstanding shares of newly
designated Series B-I convertible preferred stock in exchange for all of the
30,000 outstanding shares of Series B-1 convertible preferred stock and we
issued 20,000 outstanding shares of newly designated Series B-II convertible
preferred stock in exchange for all of the 20,000 outstanding shares of Series
B-2 convertible preferred stock. The charter and contractual terms applicable to
the Series B-I preferred and Series B-II preferred provide us with an option to
issue shares of a newly created class of Series C preferred stock, in lieu of
paying cash, in certain circumstances where the Series B-1 preferred and Series
B-2 preferred would have required us to make cash payments to holders. We also
entered into amendments to the warrants issued in the two earlier private
placements in order to provide us with a similar option to issue shares of
Series C preferred stock in certain circumstances.

         In addition, on March 19, 2002, we issued an additional 10,000 shares
of Series B-I preferred and warrants to purchase 141,730 shares of common stock
for an aggregate purchase price of $10.0 million to two of the three
institutional investors who participated in the prior private placements of our
preferred stock. These warrants are exercisable initially at a price of $23.99
per share. The other terms of these warrants are substantially identical to the
warrants, as amended, issued to the purchasers in the two earlier private
placements. We intend to use our net proceeds from this placement for working
capital and other general corporate purposes, which may include acquisitions of,
or investments in, one or more new technologies, products or businesses.

         The terms of the Series B-I, Series B-II and Series C preferred are set
forth in certificates of designations that form a part of our charter. The terms
of these series of preferred stock are summarized below in "Description of
Capital Stock." In addition, some of our obligations to holders of Series B
preferred and warrants are contained in an amended and restated securities
purchase agreement and amended and restated registration rights agreement
entered into on March 19, 2002. These agreements supercede the securities
purchase agreement and registration rights agreement we entered into with the
purchasers on February 6, 2002. The Certificate of Designations of the Series
B-I preferred and Series B-II preferred, the Certificate of Designations of the
Series C preferred stock, the amended and restated securities purchase
agreement, the amended restated registration rights agreement and the forms of
warrants and warrant amendments are attached as Exhibits 4.1, 4.2., 99.1, 99.2,
99.3, 99.4, 99.5 and 99.6 to this current report on Form 8-K.

         In connection with the placement of the Series B-I preferred, Series
B-II preferred and warrants pursuant to the amended and restated securities
purchase agreement, we amended our rights agreement dated as of March 12, 1998
with American Stock Transfer & Trust Company, as rights agent, in order to
exclude from the provisions of the rights agreement and beneficial ownership of
common stock deemed to result from holdings of Series B-I preferred or Series
B-II preferred and the warrants. A copy of the amendment is included as Exhibit
99.7 to this current report on Form 8-K.






B.   DESCRIPTION OF CAPITAL STOCK

     THE PURPOSE OF SECTION B OF THIS REPORT IS TO UPDATE THE DESCRIPTION OF THE
CAPITAL STOCK OF ASPEN TECHNOLOGY, INC. WE ANTICIPATE INCORPORATING THIS
DESCRIPTION BY REFERENCE INTO FILINGS THAT WE MAKE WITH THE SECURITIES AND
EXCHANGE COMMISSION FROM TIME TO TIME, INCLUDING ANY REGISTRATION STATEMENTS ON
FORM S-3 OR FORM S-8. THE FOLLOWING INFORMATION CONSTITUTES THE "DESCRIPTION OF
SECURITIES" REQUIRED BY ITEM 202 OF REGULATION S-K.

                          DESCRIPTION OF CAPITAL STOCK

     The following description summarizes the material terms of our common stock
and preferred stock, as well as relevant provisions of our certificate of
incorporation and bylaws and the Delaware General Corporation Law. For a
complete description of the terms of our common stock and preferred stock,
please refer to our certificate of incorporation and bylaws, each as amended
and/or restated to date. While the terms summarized below will apply generally
to any shares of common stock or preferred stock that we may offer in the
future, we will describe the particular terms of any series of these securities
in more detail in the applicable prospectus relating to the offering of these
securities. The terms of any common stock or preferred stock that we offer
pursuant to a prospectus may differ from the terms described below, and any such
additional and/or different terms will be set forth in that prospectus.

     Our authorized capital stock consists of 130,000,000 shares. These shares
consist of 120,000,000 shares of common stock, par value, $.10 par value per
share, and 10,000,000 shares of preferred stock, $.10 par value per share, of
which 400,000 shares have been designated as Series A participating cumulative
preferred stock, 40,000 shares have been designated Series B-I Convertible
preferred stock, 20,000 shares have been designated Series B-II convertible
preferred stock, and 60,000 have been designated Series C preferred stock.

COMMON STOCK

     Voting. Each holder of common stock is entitled to one vote on all matters
to be voted upon by stockholders for each share held on the record date for such
vote.

     DIVIDENDS. Subject to any preference rights of holders of preferred stock,
the holders of common stock are entitled to receive dividends, when, as and if
declared by the board of directors, out of fund legally available for dividends.

     LIQUIDATION. Upon liquidation, dissolution or winding up, holders of common
stock are entitled to share ratably in all of our assets available for
distribution to stockholders in proportion to the amount of common stock they
own. The amount available for common stockholders is calculated after our
payment of liabilities. Holders of preferred stock will receive their
preferential share of our assets before the holders of common stock receive any
assets.

     OTHER RIGHTS. Holders of the common stock have no right to
     o convert the common stock into any other security,
     o have the common stock redeemed or
     o purchase additional shares of common stock to maintain their
       proportionate ownership interest.




The common stock does not have any cumulative voting rights, which means that
the holders of a majority of the shares can elect all the directors and that the
holders of the remaining shares will not be able to elect any directors. All
outstanding shares of common stock are validly issued, fully paid and
non-assessable. The rights, preferences and privileges of holders of common
stock are subject to, and may be adversely affected by, the rights of the
holders of shares of any series of preferred stock which we have designated and
issued or may designate and issue in the future.

PREFERRED STOCK

     Our certificate of incorporation authorizes the board of directors to
issue, without any further action by the stockholders, the preferred stock in
one or more series, to establish from time to time the number of shares to be
included in each series, and to fix the designation, powers, preferences and
rights of the shares of each series and the qualifications, limitations or
restrictions thereof, including voting rights, dividend rights, conversion
rights, liquidation preferences, redemption privileges and sinking fund terms.
The rights, preferences and restrictions of the preferred stock of each series
will be fixed by the certificate of designations relating to that series. Any or
all of the rights of the preferred stock may be greater than the rights of the
common stock. In addition, the preferred stock could have other rights,
including economic rights senior to our common stock, so that the issuance of
the preferred stock could adversely effect the market value of our common stock.
The issuance of the preferred stock may also have the effect of delaying,
deferring or preventing a change in control of us without any action by the
stockholders.

SERIES B PREFERRED STOCK

     Our certificate of incorporation authorizes two series of Series B
preferred stock: Series B-I preferred stock and Series B-II preferred stock,
which we collectively refer to as the Series B preferred stock.

     VOTING. Each holder of Series B preferred stock is entitled to vote on all
matters to be voted upon by stockholders and is entitled to a number of votes
equal to the number of shares of common stock into which such holder's shares of
Series B preferred stock are convertible as of the record date for such vote.
Our certificate of incorporation also gives the holders of shares of Series B
preferred stock the right to vote as a separate class on enumerated actions that
if taken by us would impair their rights, preferences and privileges. Prior to
us taking any such action, the affirmative vote of the holders of a majority of
the outstanding shares of Series B Preferred Stock is required. Except as
otherwise provided by Delaware law, the holders of Series B preferred stock vote
with the holder of common stock as a single class on all other matters to be
voted upon by stockholders.

     DIVIDENDS. Holders of Series B preferred stock are entitled to receive, out
of funds legally available for dividends, cumulative dividends at an annual rate
of 4% of the stated value per share of such Series B preferred stock, payable
quarterly, in either cash or common stock at our option (subject to our
satisfaction of specified conditions set forth in our certificate of
incorporation).

     CONVERSION. Holders of Series B preferred stock may at any time convert
their shares into common stock at their option. Shares of Series B preferred
stock are convertible into a number of shares of common stock equal to the
stated value of such shares of Series B preferred stock, divided by the then
effective conversion price of such shares, which conversion price is subject to
antidilution and other adjustments described in our certificate of
incorporation. Subject




to conditions set forth in our certificate of incorporation, generally relating
to the market price of our common stock, we may also require holders to convert
their shares of Series B preferred into common stock.

     REDEMPTION. Beginning August 6, 2003 until February 6, 2004, in the case of
the Series B-I preferred stock, and August 28, 2003 until February 28, 2004, in
the case of the Series B-II preferred stock, holders of shares of Series B
preferred stock have the right to require us to redeem up to a specified
aggregate amount of their shares upon the occurrence of events specified in our
restated certificate of incorporation, including in certain circumstances where
the average closing price of our common stock for specified periods is below the
then-applicable conversion price for such Series of Series B preferred stock.
Beginning on February 7, 2004, in the case of the Series B-I preferred stock and
February 28, 2004, in the case of the Series B-II preferred stock, holders of
Series B preferred stock may require that we redeem any or all of their shares.
Any such redemption may be made in cash, common stock or Series C preferred
stock (or a combination thereof), at our option (subject to our satisfaction of
specified conditions set forth in our certificate of incorporation), at a price
equal to the stated value of the Series B preferred stock, plus accrued but
unpaid dividends.

     We will be required to redeem all of the outstanding shares of Series B
preferred stock on February 7, 2009 at a price equal to the stated value plus
all accrued but unpaid dividends. The redemption price may be paid in cash,
common stock or Series C preferred stock (or a combination thereof) at our
option (subject to our satisfaction of specified conditions set forth in our
certificate of incorporation).

     REPURCHASE EVENTS. Upon the occurrence of specified "triggering events,"
each holder of Series B preferred stock may require that we repurchase all or
any portion of the shares of Series B preferred stock then held by such holder
at a price per share equal to 115% of the greater of:

     o the stated value of the shares, and

     o the market value of the common stock issuable upon conversion of the
shares, together with all accrued and unpaid dividends. In addition, holders may
require that we repurchase all or any portion of shares of common stock
previously issued upon conversion of shares of Series B preferred stock, at a
price per share equal to 115% of the market value of our common stock.

The triggering events are set forth in the certificate of designations and in
general relate to:
     o bankruptcy-related events; o changes of control;
     o a suspension of trading of the common stock;
     o our failure to have sufficient authorized shares of common stock reserved
       for issuance upon conversions of Series B preferred stock or to
       deliver common stock certificates upon any such conversion;
     o our failure to cause a registration statement relating to the shares of
       common stock issuable upon conversion of the Series B preferred stock
       to be filed, or to be declared and maintained effective; or
     o our failure to make certain payments when due, or any other continuing
       default by us, under any of the documents delivered in connection with
       the issuance and sale of the Series B preferred stock.




     CERTAIN EVENTS. In the event of a change of control as specified by our
certificate of incorporation, a holder of Series B preferred stock may require
that we redeem shares of Series B preferred stock in cash at a price equal to
115% of the stated value, plus accrued but unpaid dividends or require the
successor corporation or surviving entity in the change of control to issue a
new Series of preferred stock with a stated value equal to 115% of the stated
value of the preferred stock, plus accrued but unpaid dividends thereon, and
having terms substantially equivalent to the terms of the Series B preferred
stock. In such an event, a holder alternatively may elect to convert shares of
Series B preferred stock into the consideration that the holder would have
received had the holder converted the shares of Series B preferred stock into
common stock immediately before the change of control event. In the event of an
event constituting an "organic event," (as described in our certificate of
incorporation) other than a change of control, where common stockholders are
entitled to receive securities or assets in exchange for their common stock,
holders of Series B preferred stock are entitled to receive a new security with
terms substantially equivalent to the Series B preferred stock, including
liquidation preferences and stated value.

     LIQUIDATION. In the event of any liquidation, dissolution or winding up,
the holders of Series B preferred stock are entitled to receive, prior to any
distribution to holders of common stock, an amount equal to the stated value,
plus accrued but unpaid dividends.

SERIES C PREFERRED STOCK

     VOTING. Holders of shares of Series C preferred stock have no voting rights
except as otherwise provided by Delaware law and our certificate of
incorporation. Our certificate of incorporation gives the holders of shares of
Series C preferred stock the right to vote as a separate class on enumerated
actions that if taken by us would impair their rights, preferences and
privileges. Prior to us taking any such action, the affirmative vote of the
holders of a majority of the outstanding shares of Series C Preferred Stock is
required. In addition, we have agreed with the holders of the Series B preferred
stock that the terms of the Series C preferred stock may not be amended or
eliminated without the affirmative vote of the holders of a majority of the
outstanding shares of Series B preferred stock. On such matters where the
holders of Series C preferred stock are entitled to vote, they are entitled to
one vote per share. If any shares of Series C preferred stock are outstanding,
the holders, as a separate class, shall be entitled to elect the greater of (a)
two directors or (b) 20% of the total number of directors on our board of
directors, rounded up to the nearest whole number.

     DIVIDENDS. Holders of Series C preferred stock are entitled to receive, out
of funds legally available for dividends, cumulative dividends at an annual rate
of 12% of the stated value per share of such Series C preferred stock, payable
quarterly, in either cash or through an increase in the stated value per share,
at our option (subject to our satisfaction of specified conditions set forth in
our certificate of incorporation).

     CONVERSION. Holders of Series C preferred stock have no right to convert
their shares into any other security.

     REDEMPTION. We may redeem the Series C Preferred Stock at any time at a
price per share equal to the stated value, plus all accrued but unpaid
dividends.

     CERTAIN EVENTS. In the event of a change of control as specified by our
certificate of incorporation, a holder of Series C preferred stock may require
that we, at out option, either redeem shares of Series C preferred stock in cash
at a price equal to the stated value, plus accrued but unpaid dividends or
require the successor corporation or surviving entity in the change of control
to issue a new Series of preferred stock with a stated value equal to the stated
value of the Series C preferred stock, plus accrued but unpaid dividends, and
having terms substantially




equivalent to the terms of the Series C preferred stock. In the event of an
event constituting an "organic event," (as described in our certificate of
incorporation) other than a change of control, where common stockholders are
entitled to receive securities or assets in exchange for their common stock,
holders of Series C preferred stock are entitled to receive a new security with
terms substantially equivalent to the Series C preferred stock, including
liquidation preferences and stated value.

     LIQUIDATION. In the event of any liquidation, dissolution or winding up,
the holders of Series C preferred stock are entitled to receive, prior to any
distribution to holders of common stock, an amount equal to the stated value,
plus accrued but unpaid dividends.

CERTAIN EFFECTS OF AUTHORIZED BUT UNISSUED STOCK

     We have granted our board of directors the authority to issue preferred
stock and to determine its rights and preferences in order to eliminate delays
associated with a stockholder vote on specific issuances. The issuance of
preferred stock, while providing desirable flexibility in connection with
possible acquisitions and other corporate purposes, could have the effect of
making it more difficult for a third party to acquire, or of discouraging a
third party from acquiring, a majority of our outstanding voting stock. We have
designated and reserved an aggregate of 400,000 shares of authorized but
unissued preferred stock for issuance as Series A participating cumulative
preferred stock pursuant to our Stockholder Rights Plan described below.

CERTAIN PROVISIONS OF THE CERTIFICATE OF INCORPORATION AND THE BY-LAWS

     We must comply with Section 203 of the Delaware General Corporation Law, an
anti-takeover law. In general, Section 203 prohibits a publicly-held Delaware
corporation from engaging in a "business combination" with an "interested
stockholder" for a period of three years following the date the person became an
interested stockholder, unless the business combination is approved in a
prescribed manner. Generally, a "business combination" includes mergers, asset
sales and other transactions resulting in a financial benefit to the interested
stockholder. Generally, an "interested stockholder" includes a person who,
together with affiliates and associates, owns, or within three years did own,
15% or more of the corporation's outstanding voting stock. the existence of this
provision generally will have an anti-takeover effect for transaction not
approved in advance by the board of directors, including discouraging attempts
that might result in a premium over the market price for the shares of common
stock held by stockholders.

     The Certificate of Incorporation of the Company provides for the division
of the Board of Directors into three classes as nearly equal in size as possible
with staggered three-year terms. In addition, the Certificate of Incorporation
provides that directors may be removed only for cause by the affirmative vote of
the holders of two-thirds of the shares of capital stock of the corporation
entitled to vote. Under the Certificate of Incorporation, any vacancy on the
Board of Directors, however occurring, including a vacancy resulting from an
enlargement of the Board, may only be filled by vote of a majority of the
directors then in office. The classification of the Board of Directors and the
limitations on the removal of directors and filling of vacancies could have the
effect of making it more difficult for a third party to acquire, or of
discouraging a third party from acquiring, control of the Company.

     Our certificate of incorporation also provides that any action required or
permitted to be taken by our stockholders at any annual meeting or special
meeting of stockholders may only be




taken if it is properly brought before such meeting and may not be taken by
written consent in lieu of a meeting. Our certificate of incorporation further
provides that special meetings of the stockholders may only be called by our
chairman of the board of directors, our chief executive officer or, if none, our
president or by the board of directors. Under our bylaws, in order for any
matter to be considered properly brought before a meeting, a stockholder must
comply with certain requirements regarding advance notice to us. The foregoing
provisions could have the effect of delaying until the next stockholders'
meeting stockholder actions which are favored by the holders of a majority of
our outstanding voting securities. These provisions may also discourage another
person from making a tender offer for our common stock, because such person,
even if it acquired a majority of our outstanding voting securities, would be
able to take action as a stockholder (such as electing new directors or
approving a merger) only at a duly called stockholders' meeting, and not by
written consent.

     The Delaware General Corporation Law provides generally that the
affirmative vote of a majority of the shares entitled to vote on any matter is
required to amend a corporation's certificate of incorporation or by-laws,
unless a corporation's certificate of incorporation or bylaws, as the case may
be, requires a greater percentage. Our certificate of incorporation and bylaws
require the affirmative vote of the holders of at least 75% of the voting power
of all the shares of our capital stock issued, outstanding and entitled to vote
to amend or repeal any of the provisions described in the prior two paragraphs.

     Our certificate of incorporation contains certain provisions permitted
under the Delaware General Corporation Law relating to the liability of
directors. The provisions eliminate a director's liability for monetary damages
for a breach of fiduciary duty, except in certain circumstances involving
wrongful acts, such as the breach of a director's duty of loyalty or acts or
omissions which involve intentional misconduct or a knowing violation of law.
Further, our certificate of incorporation contains provisions to indemnify our
directors and officers to the fullest extent permitted by the Delaware General
Corporation Law.

RIGHTS PLAN

     On March 12, 1998, our board of directors adopted a stockholder rights
agreement, which we refer to as the rights plan, and distributed one right for
each then outstanding share of common stock. The rights were issued to holders
of record of common stock outstanding on March 12, 1998. Each share of common
stock issued after March 12, 1998 will also include one right, subject to
certain limitations. Each right, when it becomes exercisable, will initially
entitle the registered holder to purchase from us one one-hundredth (1/100th) of
a share of Series A preferred stock at a purchase price of $175.00.

     Currently the rights are attached to our outstanding shares of common
stock. The rights are not now exercisable and cannot be transferred separately.
The rights will become exercisable and separately transferable when we learn
that any person or group, other than an exempt person, has acquired beneficial
ownership of 20% or more of the outstanding common stock or on such other date
as may be designated by the board of directors following the commencement of, or
first public disclosure of an intent to commence, a tender or exchange offer for
our outstanding common stock that could result in the offeror becoming the
beneficial owner of 15% or more of our outstanding common stock. In such
circumstances, holders of the rights will be entitled to purchase, at the
purchase price, a number of hundredths of a share of Series A preferred stock
equivalent to the number of shares of common stock (or, in certain
circumstances, other equity securities) having a market value of twice the
purchase price. Beneficial holders of 15% or more of the outstanding common
stock, however, would not be entitled to exercise their rights in such




circumstances. As a result, their voting and equity interests in us would be
substantially diluted if the rights were to be exercised.




     The rights expire in March 2008, but we may redeem them earlier at a price
of $.01 per right, in accordance with the rights plan.

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for our common stock is American Stock
Transfer & Trust Company.

NASDAQ NATIONAL MARKET LISTING

     Our common stock has been approved for trading and quotation on the Nasdaq
National Market under the symbol "AZPN."



ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

(a)  Financial Statements of Business Acquired

Not applicable.

(b)  Pro Forma Financial Information

Not applicable.

(c)  Exhibits

EXHIBIT
NUMBER    DESCRIPTION
- -------   -----------

 4.1      Certificate of Designations of the Series B-I Convertible Preferred
          Stock and Series B-II Convertible Preferred Stock.

 4.2      Certificate of Designations of the Series C Preferred Stock.

99.1      Amended and Restated Securities Purchase Agreement dated as of
          March 19, 2002 between  Aspen Technology, Inc. and the Purchasers
          named therein.

99.2      Amended and Restated Registration Rights Agreement dated as of
          March 19, 2002 between   Aspen Technology, Inc. and the
          Purchasers named therein.

99.3      Form of Warrant of Aspen Technology, Inc. dated as of February 6,
          2002.

99.4      Form of Warrant of Aspen Technology, Inc. dated as of February 28,
          2002.

99.5      Form of Amendment to Warrants of Aspen Technology, Inc. dated as of
          February 6, 2002 and February 28, 2002.

99.6      Form of Warrant of Aspen Technology, Inc. dated as of March 19, 2002.


99.7      Amendment No. 3, dated as of March 19, 2002, to Rights Agreement,
          dated as of March 12, 1998 between Aspen Technology, Inc. and American
          Stock Transfer & Trust Company, as Rights  Agent (filed as Exhibit
          4.6 to Amendment No. 4 to Form 8-A/A filed by Aspen Technology, Inc.
          on March 20, 2002 and incorporated herein by reference).

99.8      Amendment Agreement No. 4, dated as of March 19, 2002, to Credit
          Agreement dated as of  October 27, 2000 between Aspen
          Technology, Inc. and Fleet National Bank.



                                    SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                          ASPEN TECHNOLOGY, INC.


Dated:  March 19, 2002                    By: /s/ Lisa W. Zappala
                                             ----------------------------
                                             Lisa W. Zappala
                                             Senior Vice President and
                                             Chief Financial Officer





                                                                     Exhibit 4.1


                             ASPEN TECHNOLOGY, INC.

                                 ---------------

                           CERTIFICATE OF DESIGNATIONS
                                       OF
                     SERIES B-I CONVERTIBLE PREFERRED STOCK
                                       AND
                     SERIES B-II CONVERTIBLE PREFERRED STOCK

        (Pursuant to Section 151 of the Delaware General Corporation Law)

                                 ---------------

      Aspen Technology, Inc., a Delaware corporation (the "Corporation"), in
accordance with the provisions of Section 103 of the Delaware General
Corporation Law (the "DGCL") does hereby certify that, in accordance with
Section 141(c) of the DGCL, the following resolution was duly adopted by the
Board of Directors of the Corporation as of March 14, 2002:

      RESOLVED, that two series of Preferred Stock, Series B-I Convertible
Preferred Stock, par value $0.10 per share, and Series B-II Convertible
Preferred Stock, par value $0.10 per share, of the Corporation are hereby
created and the designation, number of shares, powers, preferences, rights,
qualifications, limitations and restrictions thereof (in addition to any
provisions set forth in the Certificate of Incorporation of the Corporation
which are applicable to the Preferred Stock of all classes and series) are as
follows:

                     SERIES B-I CONVERTIBLE PREFERRED STOCK
                                       AND
                     SERIES B-II CONVERTIBLE PREFERRED STOCK

      1. Designation, Amount, Par Value and Stated Value. The following two
series of preferred stock shall be designated as (i) the Corporation's Series
B-I Convertible Preferred Stock (the "SERIES B-I PREFERRED STOCK"), and the
number of shares so designated shall be 40,000, and (ii) the Corporation's
Series B-II Convertible Preferred Stock (the "SERIES B-II PREFERRED STOCK"), and
the number of shares so designated shall be 20,000. The Series B-I Preferred
Stock and Series B-II Preferred Stock are sometimes collectively referred to as
the "SERIES B PREFERRED STOCK." Each share of Series B Preferred Stock shall
have a par value of $0.10 per share and a stated value equal to $1,000 plus any
amount added to the Stated Value pursuant to Section 3(c) hereof or Section 2(f)
of the Registration Rights Agreement (the "STATED VALUE").

      2. Definitions. In addition to the terms defined elsewhere in this
Certificate of Designations, (a) the terms set forth in Exhibit A hereto have
the meanings indicated therein and (b) the following terms have the meanings
indicated:

            "CONVERSION PRICE" means the Initial Conversion Price as of the
      applicable Deemed Issue Date, as adjusted pursuant to Section 15 below.

            "DEEMED ISSUE DATE" means (i) February 6, 2002, with respect to the
      30,000 shares of Series B-I Preferred Stock originally issued on March 19,
      2002 in exchange for shares of the Series B-1 Convertible Preferred Stock
      of the Corporation, (ii) March 19, 2002, with respect to the 10,000 shares
      of Series B-I originally issued on such date, and (iii) February 28, 2002,
      with respect to the Series B-II Preferred Stock, in each case regardless
      of the number of transfers of any particular shares of such Series B
      Preferred Stock and regardless of the number of certificates that may be
      issued to evidence such Series B Preferred Stock.

            "EQUITY CONDITIONS" means, with respect to a specified issuance of
      shares of Common Stock, that each of the following conditions is
      satisfied: (i) the number of authorized but unissued and otherwise
      unreserved shares of Common Stock is sufficient for such issuance; (ii)
      such shares of Common Stock are registered for resale by the Holders and
      may be sold by the Holders pursuant to an effective Underlying Shares
      Registration Statement, such shares may be sold without volume
      restrictions pursuant to Rule 144(k) under the Securities Act or all
      Underlying Shares owned by each Holder may be sold without volume
      restrictions pursuant to Rule 144 under the Securities Act; (iii) the
      Common Stock is listed or quoted (and is not suspended from trading) on an
      Eligible Market and such shares of Common Stock are approved for listing
      upon issuance; (iv) such issuance would be permitted in full without
      violating Section 16 hereof or the rules or regulations of any Trading
      Market; (v) no Bankruptcy Event has occurred; (vi) the Corporation is not
      in default with respect to any material obligation hereunder or under any
      other Transaction Document; and (vii) none of the following events have
      occurred and are continuing (A) an event constituting a Triggering Event
      or (B) an event that with the passage of time and without being cured
      would constitute a Triggering Event other than a pending, proposed or
      intended Change of Control.

            "HOLDER" means any holder of Series B Preferred Stock.

            "INITIAL CONVERSION PRICE" means (i) in the case of Series B-I
      Preferred Stock, $19.9703, and (ii) in the case of Series B-II Preferred
      Stock, $17.66.

            "INITIAL PURCHASE PRICE" means (i) in the case of Series B-I
      Preferred Stock, $17.75, and (ii) in the case of Series B-II Preferred
      Stock, $15.69.

            "JUNIOR SECURITIES" means the Common Stock and all other equity or
      equity equivalent securities of the Corporation, other than Series C
      Preferred Stock.

            "PURCHASE AGREEMENT" means the Amended and Restated Securities
      Purchase Agreement, dated March 19, 2002, among the Corporation and the
      original purchasers of the Series B Preferred Stock, as amended from time
      to time.

            "SERIES C PREFERRED STOCK" means the Series C preferred stock of the
      Corporation to be authorized and issued as contemplated by the Purchase
      Agreement.

      3. Dividends.

            (a) Holders shall be entitled to receive, out of funds legally
available therefor, and the Corporation shall pay, cumulative dividends on the
Series B Preferred Stock at the rate per share (as a percentage of the Stated
Value per share) of 4% per annum, payable quarterly in arrears commencing on
June 30, 2002 and thereafter on each March 31, June 30, September 30 and
December 31, except if such date is not a Trading Day, in which case such
dividend shall be payable on the next succeeding Trading Day (each, a "DIVIDEND
PAYMENT DATE"). Dividends on the Series B Preferred Stock shall be calculated on
the basis of a 365-day year, shall accrue daily commencing on the Deemed Issue
Date for the applicable shares of Series B Preferred Stock, and shall be deemed
to accrue from such date whether or not earned or declared and whether or not
there are profits, surplus or other funds of the Corporation legally available
for the payment of dividends.

            (b) Subject to the conditions and limitations set forth below, the
Corporation may pay required dividends (i) in cash or (ii) in Common Stock. The
Corporation must deliver written notice (the "DIVIDEND NOTICE") to the Holders
indicating the manner in which it intends to pay dividends at least ten Trading
Days prior to each Dividend Payment Date, but the Corporation may indicate in
any such notice that the election contained therein shall continue for
subsequent Dividend Payment Dates until revised.


                                       2

Failure to timely provide such written notice shall be deemed an election by the
Corporation to pay the dividend in Common Stock, unless payment of dividends in
such manner is not permitted at the time of a dividend, in which case such
dividend shall be payable in cash. All dividends payable in respect of the
Series B Preferred Stock on any Dividend Payment Date must be paid in the same
manner.

            (c) Notwithstanding the foregoing, the Corporation may not pay
dividends by issuing Common Stock unless, at such time, the Equity Conditions
are satisfied with respect to such Common Stock dividend shares and all of the
Underlying Shares then issuable upon conversion in full of all outstanding
Series B Preferred Stock. If the Corporation is required to pay dividends in
cash on any Dividend Payment Date and does not timely make such payment, any
Holder may (but shall not be required to) treat such cash amount as if it had
been added to the Stated Value as of such Dividend Payment Date. If the
Corporation may not legally pay dividends on any Dividend Payment Date, such
amount shall be added to the Stated Value as of such Dividend Payment Date.

            (d) So long as any Series B Preferred Stock is outstanding, (i)
neither the Corporation nor any Subsidiary shall, directly or indirectly,
redeem, purchase or otherwise acquire any Junior Securities or set aside any
monies for such a redemption, purchase or other acquisition in excess of
$10,000,000 per calendar year, provided that the Corporation shall be entitled
to carry forward any amount not used in any calendar year to subsequent calendar
years, and (ii) the Corporation shall not pay or declare any dividend or make
any distribution on any Junior Securities, except pro rata stock dividends on
the Common Stock payable in additional shares of Common Stock and dividends due
and paid in the ordinary course on preferred stock of the Corporation, in each
case only at such times as the Corporation is in compliance with its payment and
other obligations hereunder.

            (e) In the event that the Corporation elects to pay dividends in
shares of Common Stock, the number of shares of Common Stock to be issued to
each Holder as such dividend shall be (i) determined by dividing the total
dividend then payable to such Holder by the Dividend Market Price (as defined
below) as of the applicable Dividend Payment Date, and rounding up to the
nearest whole share, and (ii) paid to such Holder in accordance with Section
3(f) below. The term "DIVIDEND MARKET PRICE" shall mean the average of the
Volume Weighted Average Prices of Common Stock for the five consecutive Trading
Days prior to the applicable Dividend Payment Date (not including such date).

            (f) In the event that any dividends are paid in Common Stock the
Corporation shall, on or before the third Trading Day following the payment date
of such dividend, (i) issue and deliver to such Holder a certificate, registered
in the name of the Holder or its designee, for the number of shares of Common
Stock to which the Holder shall be entitled or (ii) if and when the applicable
shares of Common Stock may be held in a balance account with The Depository
Trust Corporation through its Deposit Withdrawal Agent Commission System and
after the Holder has notified the Corporation that this clause (ii) shall apply,
credit the number of shares of Common Stock to which the Holder shall be
entitled to the Holder's or its designee's balance account with The Depository
Trust Corporation through its Deposit Withdrawal Agent Commission System.

      4. Registration of Series B Preferred Stock. The Corporation shall
register shares of the Series B Preferred Stock, upon records to be maintained
by the Corporation for that purpose (the "SERIES B PREFERRED STOCK REGISTER"),
in the name of the record Holders thereof from time to time. The Corporation may
deem and treat the registered Holder of shares of Series B Preferred Stock as
the absolute owner thereof for the purpose of any conversion hereof or any
distribution to such Holder, and for all other purposes, absent actual notice to
the contrary.

      5. Registration of Transfers. The Corporation shall register the transfer
of any shares of Series B Preferred Stock in the Series B Preferred Stock
Register, upon surrender of certificates evidencing such shares to the
Corporation at its address specified herein. Upon any such registration or
transfer, a new


                                       3

certificate evidencing the shares of Series B Preferred Stock so transferred
shall be issued to the transferee and a new certificate evidencing the remaining
portion of the shares not so transferred, if any, shall be issued to the
transferring Holder.

      6. Liquidation.

            (a) In the event of any liquidation, dissolution or winding up of
the Corporation, either voluntary or involuntary (a "LIQUIDATION EVENT"), the
Holders of Series B Preferred Stock shall be entitled to receive, prior and in
preference to any distribution of any of the assets or surplus funds of the
Corporation to the holders of Junior Securities by reason of their ownership
thereof, an amount per share in cash equal to the Stated Value for each share of
Series B Preferred Stock then held by them (as adjusted for any stock splits,
stock dividends, stock combinations and similar transactions with respect to the
Series B Preferred Stock), plus all accrued but unpaid dividends on such Series
B Preferred Stock as of the date of such event (the "SERIES B STOCK LIQUIDATION
PREFERENCE"). If, upon the occurrence of a Liquidation Event, the assets and
funds thus distributed among the Holders of the Series B Preferred Stock shall
be insufficient to permit the payment to such Holders of the full Series B Stock
Liquidation Preference, then the entire assets and funds of the Corporation
legally available for distribution shall be distributed ratably among the
Holders of the Series B Preferred Stock in proportion to the aggregate Series B
Stock Liquidation Preference that would otherwise be payable to each of such
Holders.

            (b) In the event of a Liquidation Event, following completion of the
distributions required by the first sentence of paragraph (a) of this Section 6,
if assets or surplus funds remain in the Corporation, the holders of the Common
Stock shall share ratably in all remaining assets of the Corporation, based on
the number of shares of Common Stock then outstanding.

            (c) The Corporation shall mail written notice of any Liquidation
Event to each record Holder not less than 20 Trading Days prior to the payment
date or effective date thereof.

      7. Conversion.

            (a) Conversion at Option of Holder. At the option of any Holder, any
Series B Preferred Stock held by such Holder may be converted into Common Stock
based on the applicable Conversion Price then in effect for such series of
Series B Preferred Stock. A Holder may convert Series B Preferred Stock into
Common Stock pursuant to this paragraph at any time and from time to time after
the applicable Deemed Issue Date, by delivering to the Corporation a Conversion
Notice, in the form attached hereto as Exhibit B, appropriately completed and
duly signed, and the date any such Conversion Notice is delivered to the
Corporation (as determined in accordance with the notice provisions hereof) is a
"CONVERSION DATE."

            (b) Conversion at Option of Corporation. If, at any time after the
Effective Date, the Closing Price on each of 20 consecutive Trading Days (a
"QUALIFYING PERIOD") exceeds 135% of the applicable Conversion Price for a
series of Series B Preferred Stock (each, a "THRESHOLD PRICE"), the Corporation
may require the Holders to convert the shares of such series into Common Stock
based on the applicable Conversion Price. The Corporation may require a
conversion pursuant to this paragraph by delivering irrevocable written notice
of such election to the Holders, and the fifth Trading Day after the date any
such notice is delivered to the Holders (as determined in accordance with the
notice provisions hereof) will be the "CONVERSION DATE" for such required
conversion. Notwithstanding the foregoing, (i) if the Corporation has publicly
announced a pending, proposed or intended Change of Control and the Qualifying
Period includes any Trading Days on or after the date of such public
announcement, then to the extent that a Holder has not had the ability to sell
all or a portion of the Underlying Shares pursuant to Rule 144 under the
Securities Act or an effective Underlying Share Registration Statement for at
least 20 Trading Days after the date of the public announcement of such Change
of Control, the Conversion Date


                                       4

with respect to those shares of Series B Preferred Stock that are convertible
into the portion of the Underlying Shares that are not so saleable shall be
deferred until the date on which such Underlying Shares shall have been so
saleable for a period of 20 Trading Days from the date of such public
announcement (and if no such period of 20 Trading Days occurs prior to the
Change of Control with respect to any such Underlying Shares then the notice of
conversion applicable to those shares of Series B Preferred Stock convertible
into such Underlying Shares shall be void) and (ii) the Corporation may not
require any conversion under this paragraph (and any notice thereof will be
void), unless from the beginning of such period of 20 consecutive Trading Days
through the Conversion Date, (A) the Equity Conditions are satisfied with
respect to all of the Underlying Shares then issuable upon conversion in full of
all outstanding Series B Preferred Stock, and (B) the Closing Price equals or
exceeds the applicable Threshold Price.

      8. Mechanics of Conversion.

            (a) The number of Underlying Shares issuable upon any conversion of
shares of either series of Series B Preferred Stock hereunder shall equal (i)
the Stated Value of such share of Series B Preferred Stock to be converted,
divided by the applicable Conversion Price on the Conversion Date, plus (ii) the
amount of any accrued but unpaid dividends on such share of Series B Preferred
Stock through the Conversion Date, divided by the applicable Conversion Price on
the Conversion Date.

            (b) Upon conversion of any Series B Preferred Stock, the Corporation
shall promptly (but in no event later than three Trading Days after the
Conversion Date) issue or cause to be issued and cause to be delivered to or
upon the written order of the Holder and in such name or names as the Holder may
designate a certificate for the Underlying Shares issuable upon such conversion,
free of restrictive legends unless such Underlying Shares are not then freely
transferable without volume restrictions pursuant to Rule 144(k) under the
Securities Act. The Holder, or any Person so designated by the Holder to receive
Underlying Shares, shall be deemed to have become holder of record of such
Underlying Shares as of the Conversion Date. If and when such Underlying Shares
may be freely transferred pursuant to Rule 144 under the Securities Act or
pursuant to an effective Underlying Shares Registration Statement, the
Corporation shall use its best efforts to deliver Underlying Shares hereunder
electronically through the Depository Trust Corporation or another established
clearing corporation performing similar functions, and shall issue such
Underlying Shares in the same manner as dividend payment shares are issued
pursuant to Section 3(f) above.

            (c) A Holder shall not be required to deliver the original
certificate(s) evidencing the Series B Preferred Stock being converted in order
to effect a conversion of such Series B Preferred Stock. Execution and delivery
of the Conversion Notice shall have the same effect as cancellation of the
original certificate(s) and issuance of a new certificate evidencing the
remaining shares of Series B Preferred Stock. Upon surrender of a certificate
following one or more partial conversions, the Corporation shall promptly
deliver to the Holder a new certificate representing the remaining shares of
Series B Preferred Stock.

            (d) The Corporation's obligations to issue and deliver Underlying
Shares upon conversion of Series B Preferred Stock in accordance with the terms
hereof are absolute and unconditional, irrespective of any action or inaction by
any Holder to enforce the same, any waiver or consent with respect to any
provision hereof, the recovery of any judgment against any Person or any action
to enforce the same, or any setoff, counterclaim, recoupment, limitation or
termination, or any breach or alleged breach by any Holder or any other Person
of any obligation to the Corporation or any violation or alleged violation of
law by any Holder or any other Person, and irrespective of any other
circumstance which might otherwise limit such obligation of the Corporation to
any Holder in connection with the issuance of such Underlying Shares.


                                       5

      9. Redemption Rights.

            (a) Holders' Redemption Rights.

                  (i) Subject to the provisions of Section 9(a)(iii) below, if,
      at any time on or after August 7, 2003, in the case of the Series B-I
      Preferred Stock, and August 28, 2003, in the case of the Series B-II
      Preferred Stock (either such date being referred to as an "Initial
      Redemption Date"), the average of the Closing Prices for 20 consecutive
      Trading Days immediately preceding the applicable Initial Redemption Date
      or any date thereafter is below the applicable Conversion Price of such
      series of Series B Preferred Stock, the Holder of such Series B Preferred
      Stock, upon 15 Trading Days' advance notice (the "REDEMPTION NOTICE") to
      the Corporation, shall have the right to request the Corporation to redeem
      that number of shares of Series B Preferred Stock held by such Holders as
      is set forth in the Redemption Notice at a per share price (the
      "REDEMPTION PRICE") equal to the Stated Value of such shares of Series B
      Preferred Stock to be redeemed plus all accrued but unpaid dividends
      thereon to the date of payment.

                  (ii) Notwithstanding anything to the contrary in Section
      9(a)(i), the Holders of the Series B Preferred Stock (x) may not deliver a
      Redemption Notice with respect to a particular series of Series B
      Preferred Stock until after the applicable Initial Redemption Date, (y)
      may not deliver a Redemption Notice covering in aggregate more than
      $20,000,000 of Stated Value, with respect to the Series B-I Preferred
      Stock, until after February 7, 2004, and $10,000,000 of Stated Value, with
      respect to the Series B-II Preferred Stock, until after February 28, 2004,
      and (z) may deliver a Redemption Notice with respect to a particular
      series of Series B Preferred Stock after February 7, 2004 or February 28,
      2004, as applicable, irrespective of whether the average of the Closing
      Prices for the 20 consecutive Trading Days is below the applicable
      Conversion Price of such series of Series B Preferred Stock and without
      limit as to Stated Value.

                  (iii) Within three Trading Days of receipt of a Redemption
      Notice, the Corporation will deliver written notice to each Holder of the
      applicable series of Series B Preferred Stock (the "CORPORATION NOTICE"),
      confirming pursuant to the Redemption Notice the aggregate amount of such
      Series B Preferred Stock being redeemed, the Redemption Date (as defined
      below) and the applicable Redemption Prices. Notwithstanding the aggregate
      shares set forth in the Redemption Notice, each Holder of such series of
      Series B Preferred Stock shall have the right to elect to have all or any
      number of shares of the applicable series of Series B Preferred Stock held
      by such Holder redeemed on the Redemption Date at the applicable
      Redemption Price by notifying the Corporation within five Trading Days of
      receipt of the Corporation Notice of its election to do so, and specifying
      the number of shares as to which such election is made. In the event that
      the aggregate number of shares of Series B Preferred Stock to be redeemed
      on such Redemption Date exceeds the aggregate limitations set forth in
      Section 9(a)(ii), the number of shares to be redeemed from each Holder
      shall be reduced pro rata based upon the aggregate number of shares of the
      applicable series of Series B Preferred Stock held by each Holder
      requesting redemption.

                  (iv) The Redemption Notice will specify the effective date of
      the redemption, which must be a Trading Day at least 15 Trading Days after
      the date such notice is delivered (the "REDEMPTION DATE"), and the entire
      Redemption Price may be paid at the Corporation's option in cash, in
      Common Stock or in Series C Preferred Stock. The Corporation must deliver
      written notice to the Holders indicating the manner in which it intends to
      pay the Redemption Price at least three Trading Days after receipt of the
      Redemption Notice. Failure to timely provide such written notice shall be
      deemed an election by the Corporation to make the payment in Common Stock.
      Notwithstanding the foregoing, the Corporation (a) may not pay the
      Redemption Price by issuing Common Stock unless, at such time, the Equity
      Conditions are satisfied with respect to such


                                       6

      Common Stock and (b) may not pay the Redemption Price by issuing Series C
      Preferred Stock unless, at such time, the Equity Conditions are not
      satisfied.

                  (v) Upon receipt of payment of the Redemption Price, each
      Holder will deliver the original certificate(s) evidencing the Series B
      Preferred Stock so redeemed to the Corporation, unless such Holder is
      awaiting receipt of a new certificate evidencing such shares from the
      Corporation pursuant to another provision hereof. At any time on or prior
      to the Redemption Date, the Holders may convert any or all of the shares
      of Series B Preferred Stock, and the Corporation shall honor any such
      conversions in accordance with the terms hereof.

                  (vi) In the event that the Corporation elects to pay the
      Redemption Price in shares of Common Stock, the number of shares of Common
      Stock to be issued to each Holder as payment of the Redemption Price shall
      be determined by dividing the total Redemption Price then payable to such
      Holder by the Redemption Market Price (as defined below) as of the
      applicable Redemption Date, and rounding up to the nearest whole share.
      Such shares shall be issued to such Holder in the same manner as dividend
      payment shares are issued pursuant to Section 3(f) above. The term
      "REDEMPTION MARKET PRICE" shall mean the average of the Volume Weighted
      Average Prices of Common Stock for the ten consecutive Trading Days prior
      to the applicable Redemption Date (not including such date).

                  (vii) In the event that the Corporation elects to pay the
      Redemption Price in shares of Series C Preferred Stock, the number of
      shares of Series C Preferred Stock to be issued to each Holder in payment
      of the Redemption Price shall be determined by dividing the total
      Redemption Price then payable to such Holder with respect to all of such
      Holder's shares of Series B Preferred Stock by $10,000 (the initial stated
      value per share of the Series C Preferred Stock) and rounding downward to
      the nearest whole number of shares of Series C Preferred Stock. In
      addition, the Corporation shall pay to Holder in cash the amount, if any,
      by which the Redemption Price payable to such Holder exceeds the aggregate
      stated value of the Series C Preferred Stock issued pursuant to the
      preceding sentence. If the total Redemption Price payable to a Holder is
      less than $10,000, then the Corporation shall pay such amount to such
      Holder entirely in cash.

            (b) Mandatory Redemption. On February 7, 2009 (the "MANDATORY
REDEMPTION DATE"), the Corporation shall redeem all of the then outstanding
Series B Preferred Stock at a price equal to 100% of the Stated Value of such
shares of Series B Preferred Stock plus all accrued but unpaid dividends thereon
to the date of payment in cash, Common Stock or Series C Preferred Stock (or a
combination thereof) at the election of the Corporation. The Corporation must
deliver written notice to the Holders indicating the manner in which it intends
to pay the Redemption Price at least 20 Trading Days prior to the Mandatory
Redemption Date. Failure to timely provide such written notice shall be deemed
an election by the Corporation to make the payment in Common Stock.
Notwithstanding the foregoing, the Corporation (i) may not pay the Redemption
Price by issuing Common Stock unless, at such time, the Equity Conditions are
satisfied with respect to such Common Stock and (ii) may not pay the Redemption
Price by issuing Series C Preferred Stock unless, at such time, the Equity
Conditions are not satisfied. Upon receipt of payment of the Redemption Price,
each Holder will deliver the original certificate(s) evidencing the Series B
Preferred Stock so redeemed to the Corporation, unless such Holder is awaiting
receipt of a new certificate evidencing such shares from the Corporation
pursuant to another provision hereof. In the event that the Corporation elects
to pay the Redemption Price in shares of Common Stock or Series C Preferred
Stock, the number of such shares shall be determined in the manner described in
Section 9(a)(vi) or (vii), as the case may be. At any time on or prior to the
Mandatory Redemption Date, the Holders may convert any or all of the shares of
Series B Preferred Stock, and the Corporation shall honor any such conversions
in accordance with the terms hereof.


                                       7

      10. Triggering Events. At any time or times following the occurrence of a
Triggering Event (other than a Change of Control), each Holder shall have the
option to elect, by notice to the Corporation (an "EVENT NOTICE"), to require
the Corporation to repurchase all or any portion of (i) the Series B Preferred
Stock then held by such Holder, at a price per share equal to the greater of (A)
115% of the Stated Value plus all accrued but unpaid dividends thereon through
the date of payment, or (B) the Event Equity Value of the Underlying Shares
issuable upon conversion of such Series B Preferred Stock (including such
accrued but unpaid dividends thereon), and (ii) any Underlying Shares issued to
such Holder upon conversion of Series B Preferred Stock, at a price per share
equal to the Event Equity Value of such Underlying Shares. The aggregate amount
payable pursuant to the preceding sentence is referred to as the "EVENT PRICE."
The Corporation shall pay the aggregate Event Price to each Holder in cash or
Series C Preferred Stock (or a combination thereof), at the election of the
Corporation, by no later than the third Trading Day following the date of
delivery of the Event Notice, and upon receipt thereof such Holder shall deliver
original certificates evidencing the shares of Series B Preferred Stock and
Underlying Shares so repurchased to the Corporation (to the extent such
certificates have been delivered to the Holder). In the event that the
Corporation elects to pay the Redemption Price in shares of Series C Preferred
Stock, the number of such shares shall be determined in the manner described in
Section 9(a)(vii).

      11. Voting Rights. Except as otherwise provided herein or as required by
applicable law, the Holders of the Series B Preferred Stock shall be entitled to
vote on all matters on which holders of Common Stock are entitled to vote,
including, without limitation, the election of directors. For such purposes,
each Holder shall be entitled to a number of votes in respect of the shares of
Series B Preferred Stock owned by it equal to the number of shares of Common
Stock into which such shares of Series B Preferred Stock are convertible as of
the record date for the determination of stockholders entitled to vote on such
matter, or if no record date is established, at the date such vote is taken or
any written consent of stockholders is solicited. Except as otherwise provided
herein, in any relevant agreement or as required by applicable law, the holders
of the Series B Preferred Stock and Common Stock, respectively, shall vote
together as a single class on all matters submitted to a vote or consent of
stockholders; provided that so long as any shares of Series B Preferred Stock
are outstanding, the Corporation shall not, without the affirmative vote of the
Holders of a majority of the shares of Series B Preferred Stock then
outstanding, (a) alter or change adversely the powers, preferences or rights
given to the Series B Preferred Stock or alter or amend this Certificate of
Designations (whether by merger, reorganization, consolidation or otherwise),
(b) authorize or create any class of stock ranking as to dividends or
distribution of assets upon a Liquidation Event or Change of Control senior to
the Series B Preferred Stock, (c) amend its certificate of incorporation or
bylaws so as to affect adversely any rights of the Holders (whether by merger,
reorganization, consolidation or otherwise), (d) increase the authorized number
of shares of Series B Preferred Stock, or (e) enter into any agreement with
respect to the foregoing.

      12. Charges, Taxes and Expenses. Issuance of certificates for shares of
Series B Preferred Stock and for Underlying Shares issued on conversion of (or
otherwise in respect of) the Series B Preferred Stock shall be made without
charge to the Holders for any issue or transfer tax, withholding tax, transfer
agent fee or other incidental tax or expense in respect of the issuance of such
certificates, all of which taxes and expenses shall be paid by the Corporation;
provided, however, that the Corporation shall not be required to pay any tax
that may be payable in respect of any transfer involved in the registration of
any certificates for Common Stock or Series B Preferred Stock in a name other
than that of the Holder. The Holder shall be responsible for all other tax
liability that may arise as a result of holding or transferring the Series B
Preferred Stock or receiving Underlying Shares in respect of the Series B
Preferred Stock.

      13. Replacement Certificates. If any certificate evidencing Series B
Preferred Stock or Underlying Shares is mutilated, lost, stolen or destroyed,
the Corporation shall issue or cause to be issued in exchange and substitution
for and upon cancellation hereof, or in lieu of and substitution for such


                                       8

certificate, a new certificate, but only upon receipt of evidence reasonably
satisfactory to the Corporation of such loss, theft or destruction and customary
and reasonable indemnity, if requested. Applicants for a new certificate under
such circumstances shall also comply with such other reasonable regulations and
procedures and pay such other reasonable third-party costs as the Corporation
may prescribe.

      14. Reservation of Underlying Shares. The Corporation covenants that it
shall at all times reserve and keep available out of the aggregate of its
authorized but unissued and otherwise unreserved Common Stock, solely for the
purpose of enabling it to issue the Underlying Shares as required hereunder (i)
a sufficient number of authorized but unissued and otherwise unreserved shares
of Common Stock available to issue Underlying Shares upon any conversion of
Shares or, if the number of shares so reserved is insufficient to make available
a sufficient number of authorized but unissued and otherwise unreserved shares
of Common Stock for such issuance within 60 days after the occurrence of such
deficiency, and (ii) at least 6,401,394 authorized but unissued and otherwise
unreserved shares of Common Stock (as adjusted for any stock splits, stock
combinations or similar events) less any shares of Common Stock issued upon
conversion of the Shares, as dividends on the Shares, upon exercise of the
Warrants or upon a redemption of the Shares. The Corporation covenants that all
Underlying Shares so issuable and deliverable shall, upon issuance in accordance
with the terms hereof, be duly and validly authorized, issued and fully paid and
nonassessable.

      15. Certain Adjustments. The Conversion Price is subject to adjustment
from time to time as set forth in this Section 15.

            (a) Stock Dividends and Splits. If the Corporation, at any time
while Series B Preferred Stock is outstanding, (i) pays a stock dividend on its
Common Stock or otherwise makes a distribution on any class of capital stock
that is payable in shares of Common Stock (other than regular dividends on the
Series B Preferred Stock), (ii) subdivides outstanding shares of Common Stock
into a larger number of shares, or (iii) combines outstanding shares of Common
Stock into a smaller number of shares, then in each such case the applicable
Conversion Price for each series of Series B Preferred Stock shall be multiplied
by a fraction of which the numerator shall be the number of shares of Common
Stock outstanding immediately before such event and of which the denominator
shall be the number of shares of Common Stock outstanding immediately after such
event. Any adjustment made pursuant to clause (i) of this paragraph shall become
effective immediately after the record date for the determination of
stockholders entitled to receive such dividend or distribution, and any
adjustment pursuant to clause (ii) or (iii) of this paragraph shall become
effective immediately after the effective date of such subdivision or
combination.

            (b) Pro Rata Distributions. If the Corporation, at any time while
Series B Preferred Stock is outstanding, distributes to all holders of Common
Stock (i) evidences of its indebtedness, (ii) any security (other than a
distribution of Common Stock covered by the preceding paragraph), (iii) rights
or warrants to subscribe for or purchase any security, or (iv) any other asset
other than cash paid as a dividend (in each case, "DISTRIBUTED PROPERTY"), then,
at the request of any Holder delivered before the ninetieth day after the record
date fixed for determination of stockholders entitled to receive such
distribution, the Corporation will deliver to such Holder, within five Trading
Days after such request (or, if later, on the effective date of such
distribution), the Distributed Property that such Holder would have been
entitled to receive in respect of the Underlying Shares for which such Holder's
Series B Preferred Stock could have been converted immediately prior to such
record date. If such Distributed Property is not delivered to a Holder pursuant
to the preceding sentence, then upon any conversion of Series B Preferred Stock
that occurs after such record date, such Holder shall be entitled to receive, in
addition to the Underlying Shares otherwise issuable upon such conversion, the
Distributed Property that such Holder would have been entitled to receive in
respect of such number of Underlying Shares had the Holder been the record
holder of such Underlying Shares immediately prior to such record date.


                                       9

            (c) Certain Transactions.

                  (i) If, at any time while Series B Preferred Stock is
      outstanding, the Corporation proposes to enter into a transaction that
      would constitute a Change of Control, the Corporation shall mail written
      notice of the proposed Change of Control transaction to each record Holder
      not less than 20 Trading Days prior to the effective date thereof. Each
      Holder shall have the right to receive on the date of the consummation of
      such Change of Control, at its option, either (A) for each Underlying
      Share that would have been issuable upon such conversion of the shares of
      Series B Preferred Stock upon the effective time of such Change of
      Control, the same kind and amount of securities, cash or property as it
      would have been entitled to receive upon the occurrence of such Change of
      Control if it had been, immediately prior to such Change of Control, the
      holder of one share of Common Stock or (B) for each share of Series B
      Preferred Stock, cash in an amount equal to 115% of the Stated Value plus
      all accrued but unpaid dividends thereon through the date of payment. If
      holders of Common Stock are given any choice as to the securities, cash or
      property to be received in a Change of Control transaction, then each
      Holder shall be given the same choice as to the consideration it receives
      pursuant to clause (A) above. Each Holder shall make the election of which
      consideration it has elected to receive at least three Trading Days prior
      to the effective date of a Change of Control. Failure of any Holder to
      timely provide written notice of its election shall be deemed an election
      by such Holder to receive the consideration specified in clause (B) above.
      Notwithstanding the foregoing, if a Holder elects to receive cash pursuant
      to clause (B) of the preceding sentence or is deemed to have so elected,
      the Corporation may elect instead to have such successor to the
      Corporation or surviving entity in the Change of Control issue to the
      Holder a new series of Preferred Stock with a stated value equal to 115%
      of the Stated Value of the Series B Preferred Stock, plus all accrued but
      unpaid dividends thereon, and consistent with terms substantially
      equivalent to the terms of the Series B-I Preferred Stock or Series B-II
      Preferred Stock, as the case may be, held by such Holder and evidencing
      the Holder's right to convert such Preferred Stock into the consideration
      described in clause (A) of this subparagraph (i). To the extent the
      Corporation elects to have the successor to the Corporation or the
      surviving entity issue a new series of Preferred Stock, the terms of any
      agreement pursuant to which a Change of Control is effected shall include
      terms requiring any such successor or surviving entity to comply with the
      provisions substantially equivalent to the provisions of this paragraph
      (c) and providing that the Series B Preferred Stock (or any such
      replacement security) will be similarly adjusted upon any subsequent
      transaction analogous to a Change of Control.

                  (ii) Any recapitalization, reorganization, reclassification,
      consolidation, merger, sale of all or substantially all of the
      Corporation's assets to another Person or other transaction which is
      effected in such a way that holders of Common Stock are entitled to
      receive (either directly or upon subsequent liquidation) stock, securities
      or assets with respect to or in exchange for Common Stock is referred to
      herein as "ORGANIC CHANGE." Prior to the consummation of any (A) sale of
      all or substantially all of the Corporation's assets to an acquiring
      Person or (B) other Organic Change following which the Corporation is not
      a surviving entity, other than in each case an Organic Change that is a
      Change of Control (which shall be subject to Section 15(c)(i)), the
      Corporation will secure from the Person purchasing such assets or the
      successor, or, if applicable, the parent of the successor, resulting from
      such Organic Change (in each case, the "ACQUIRING ENTITY") a written
      agreement (in form and substance reasonably satisfactory to the holders of
      at least a majority of the shares of Series B Preferred Stock then
      outstanding) to deliver to each holder of Series B Preferred Stock in
      exchange for such shares, a security of the Acquiring Entity evidenced by
      a written instrument substantially similar in form and substance to such
      Series B Preferred Stock, including, without limitation, having a stated
      value and liquidation preference equal to the Stated Value and the Series
      B Stock Liquidation Preference of the Series B Preferred Stock held by
      such holder, and


                                       10

      reasonably satisfactory to the holders of at least a majority of the
      Series B Preferred Stock then outstanding.

            (d) Subsequent Equity Sales.

                  (i) If, at any time while any shares of either series of
      Series B Preferred Stock are outstanding, the Corporation or any
      Subsidiary issues additional shares of Common Stock or rights, warrants,
      options or other securities or debt convertible, exercisable or
      exchangeable for shares of Common Stock or otherwise entitling any Person
      to acquire shares of Common Stock (collectively, "COMMON STOCK
      EQUIVALENTS") at an effective net price to the Corporation per share of
      Common Stock (the "EFFECTIVE PRICE") less than the lesser of (A) the
      Initial Purchase Price for a series of Series B Preferred Stock or (B)
      then-applicable Conversion Price for a series of Series B Preferred Stock,
      then the applicable Conversion Price for such series of Series B Preferred
      Stock shall be reduced to equal the Effective Price. For purposes of this
      paragraph, in connection with any issuance of any Common Stock
      Equivalents, (A) the maximum number of shares of Common Stock potentially
      issuable at any time upon conversion, exercise or exchange of such Common
      Stock Equivalents (the "DEEMED NUMBER") shall be deemed to be outstanding
      upon issuance of such Common Stock Equivalents, (B) the Effective Price
      applicable to such Common Stock shall equal the minimum dollar value of
      consideration payable to the Corporation to purchase such Common Stock
      Equivalents and to convert, exercise or exchange them into Common Stock
      (net of any discounts, fees, commissions and other expenses), divided by
      the Deemed Number, (C) no further adjustment shall be made to the
      Conversion Price upon the actual issuance of Common Stock upon conversion,
      exercise or exchange of such Common Stock Equivalents, and (D) upon the
      expiration or termination of any Common Stock Equivalent that does not
      result in the issuance of any Common Stock or additional Common Stock
      Equivalent, any adjustment that has been made under this paragraph (d) in
      respect of the issuance of such Common Stock Equivalent shall be
      readjusted as if such Common Stock Equivalent had not been issued (but
      shall in no event affect previously converted stock).

                  (ii) If, at any time while Series B Preferred Stock is
      outstanding, the Corporation or any Subsidiary issues Common Stock
      Equivalents with an Effective Price or a number of underlying shares that
      floats or resets or otherwise varies or is subject to adjustment based
      (directly or indirectly) on market prices of the Common Stock (a "FLOATING
      PRICE SECURITY"), then for purposes of applying the preceding paragraph in
      connection with any subsequent conversion, the Effective Price will be
      determined separately on each Conversion Date and will be deemed to equal
      the lowest Effective Price at which any holder of such Floating Price
      Security is entitled to acquire Common Stock on such Conversion Date
      (regardless of whether any such holder actually acquires any shares on
      such date).

                  (iii) Notwithstanding the foregoing, no adjustment will be
      made under this paragraph (d) in respect of the issuance of Excluded
      Stock.

            (e) Calculations. All calculations under this Section 15 shall be
made to the nearest cent or the nearest 1/100th of a share, as applicable. The
number of shares of Common Stock outstanding at any given time shall not include
shares owned or held by or for the account of the Corporation, and the
disposition of any such shares shall be considered an issue or sale of Common
Stock.

            (f) Notice of Adjustments. Upon the occurrence of each adjustment
pursuant to this Section 15, the Corporation at its expense will promptly
compute such adjustment in accordance with the terms hereof and prepare a
certificate describing in reasonable detail such adjustment and the transactions
giving rise thereto, including all facts upon which such adjustment is based.
Upon written request, the


                                       11

Corporation will promptly deliver a copy of each such certificate to each Holder
and to the Corporation's Transfer Agent.

            (g) Notice of Corporate Events. If the Corporation (i) declares a
dividend or any other distribution of cash, securities or other property in
respect of its Common Stock, including without limitation any granting of rights
or warrants to subscribe for or purchase any capital stock of the Corporation or
any Subsidiary, (ii) authorizes or approves, enters into any agreement
contemplating or solicits stockholder approval for any Fundamental Transaction
or (iii) authorizes the voluntary dissolution, liquidation or winding up of the
affairs of the Corporation, then the Corporation shall deliver to each Holder a
notice describing the material terms and conditions of such transaction, at
least 20 calendar days prior to the applicable record or effective date on which
a Person would need to hold Common Stock in order to participate in or vote with
respect to such transaction, and the Corporation will take all steps reasonably
necessary in order to insure that each Holder is given the practical opportunity
to convert its Series B Preferred Stock prior to such time so as to participate
in or vote with respect to such transaction; provided, however, that the failure
to deliver such notice or any defect therein shall not affect the validity of
the corporate action required to be described in such notice.

      16. Limitation on Conversion.

            (a) Notwithstanding anything to the contrary contained herein, the
number of shares of Common Stock that may be acquired by any Holder upon any
conversion of Series B Preferred Stock (or otherwise in respect of the Series B
Preferred Stock) shall be limited to the extent necessary to insure that,
following such conversion (or other issuance), the total number of shares of
Common Stock then beneficially owned by such Holder and its Affiliates and any
other Persons whose beneficial ownership of Common Stock would be aggregated
with the Holder's for purposes of Section 13(d) of the Exchange Act, does not
exceed 4.999% (the "MAXIMUM PERCENTAGE") of the total number of issued and
outstanding shares of Common Stock (including for such purpose the shares of
Common Stock issuable upon such conversion). For such purposes, beneficial
ownership shall be determined in accordance with Section 13(d) of the Exchange
Act and the rules and regulations promulgated thereunder. Each delivery of a
Conversion Notice by a Holder will constitute a representation by such Holder
that it has evaluated the limitation set forth in this paragraph and determined
that issuance of the full number of Underlying Shares requested in such
Conversion Notice is permitted under this paragraph. By written notice to the
Corporation, any Holder may waive the provisions of this Section or increase or
decrease the Maximum Percentage to any other percentage specified in such
notice, but (i) any such waiver or increase will not be effective until the 61st
day after such notice is delivered to the Corporation, and (ii) any such waiver
or increase or decrease will apply only to such Holder and not to any other
Holder and (iii) any such waiver or increase shall not be effective to the
extent such waiver or increase would cause the Corporation to violate the Nasdaq
Stockholder Approval Rule.

            (b) For purposes of this Section 16, in determining the number of
outstanding shares of Common Stock, a Holder may rely on the number of
outstanding shares of Common Stock as reflected in (1) the Corporation's most
recent Form 10-Q, Form 10-K or other public filing with the Commission, as the
case may be, (2) a more recent public announcement by the Corporation, or (3)
any other notice by the Corporation or its transfer agent setting forth the
number of shares of Common Stock outstanding. Upon the written request of any
Holder, the Corporation shall promptly, but in no even later than one Trading
Day following the receipt of such notice, confirm in writing to any such Holder
the number of shares of Common Stock then outstanding.

      17. Fractional Shares. The Corporation shall not be required to issue or
cause to be issued fractional Underlying Shares on conversion of Series B
Preferred Stock. If any fraction of an Underlying


                                       12

Share would, except for the provisions of this Section, be issuable upon
conversion of Series B Preferred Stock, the number of Underlying Shares to be
issued will be rounded up to the nearest whole share.

      18. Notices. Any and all notices or other communications or deliveries
hereunder (including without limitation any Conversion Notice) shall be in
writing and shall be deemed given and effective on the earliest of (i) the date
of transmission, if such notice or communication is delivered via facsimile at
the facsimile number specified in this Section prior to 5:30 p.m. (New York City
time) on a Trading Day, (ii) the next Trading Day after the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile number specified in this Section on a day that is not a Trading Day or
later than 5:30 p.m. (New York City time) on any Trading Day, (iii) the Trading
Day following the date of mailing, if sent by nationally recognized overnight
courier service, or (iv) upon actual receipt by the party to whom such notice is
required to be given. The addresses for such communications shall be (i) if to
the Corporation, to Ten Canal Park, Cambridge, Massachusetts 02141, facsimile:
(617) 949-1722, Attention: Chief Executive Officer and General Counsel, or (ii)
if to a Holder, to the address or facsimile number appearing on the
Corporation's stockholder records or such other address or facsimile number as
such Holder may provide to the Corporation in accordance with this Section.

      19. Miscellaneous.

            (a) The headings herein are for convenience only, do not constitute
a part of this Certificate of Designations and shall not be deemed to limit or
affect any of the provisions hereof.

            (b) Any of the rights of the Holders of Series B Preferred Stock set
forth herein may be waived by the affirmative vote of the Holders of a majority
of the shares of Series B Preferred Stock then outstanding. No waiver of any
default with respect to any provision, condition or requirement of this
Certificate of Designations shall be deemed to be a continuing waiver in the
future or a waiver of any subsequent default or a waiver of any other provision,
condition or requirement hereof, nor shall any delay or omission of either party
to exercise any right hereunder in any manner impair the exercise of any such
right.

                                      * * *


                                       13

      IN WITNESS WHEREOF, Aspen Technology, Inc. has caused this Certificate of
Designations to be duly executed as of March 19, 2002.

                                        ASPEN TECHNOLOGY, INC.


                                        By: /s/ Lisa W. Zappala
                                            ------------------------------------
                                            Lisa W. Zappala
                                            Senior Vice President and
                                              Chief Financial Officer


                                       14

                                                                       EXHIBIT A

                             ADDITIONAL DEFINITIONS

      "AFFILIATE" means any Person that, directly or indirectly through one or
more intermediaries, controls or is controlled by or is under common control
with a Person, as such terms are used in and construed under Rule 144. With
respect to a Purchaser, any investment fund or managed account that is managed
on a discretionary basis by the same investment manager as such Purchaser will
be deemed to be an Affiliate of such Purchaser.

      "BANKRUPTCY EVENT" means any of the following events: (a) the Corporation
or any Material Subsidiary commences a case or other proceeding under any
bankruptcy, reorganization, arrangement, adjustment of debt, relief of debtors,
dissolution, insolvency or liquidation or similar law of any jurisdiction
relating to the Corporation or any Material Subsidiary thereof; (b) there is
commenced against the Corporation or any Material Subsidiary any such case or
proceeding that is not dismissed within 60 days after commencement; (c) the
Corporation or any Material Subsidiary is adjudicated insolvent or bankrupt or
any order of relief or other order approving any such case or proceeding is
entered; (d) the Corporation or any Material Subsidiary suffers any appointment
of any custodian or the like for it or any substantial part of its property that
is not discharged or stayed within 60 days; (e) the Corporation or any Material
Subsidiary makes a general assignment for the benefit of creditors; (f) the
Corporation or any Material Subsidiary fails to pay, or states in writing that
it is unable to pay or is unable to pay, its debts generally as they become due;
or (g) the Corporation or any Subsidiary, by any act or failure to act,
expressly indicates its consent to, approval of or acquiescence in any of the
foregoing or takes any corporate or other action that effects any of the
foregoing.

      "CHANGE OF CONTROL" means the occurrence of any of the following in one or
a series of related transactions: (i) an acquisition after the date hereof by an
individual or legal entity or "group" (as described in Rule 13d-5(b)(1) under
the Exchange Act) of a majority of the voting rights or equity interests in the
Corporation; (ii) a replacement of more than one-half of the members of the
Corporation's Board of Directors that is not approved by those individuals who
are members of the Board of Directors on the Deemed Issue Date (or other
directors previously approved by such individuals); (iii) a merger or
consolidation of the Corporation or a sale of all or substantially all of the
assets of the Corporation in one or a series of related transactions, unless
following such transaction or series of transactions, the holders of the
Corporation's securities prior to the first such transaction continue to hold,
directly or indirectly, at least a majority of the voting rights and equity
interests in the surviving entity or acquirer of such assets; (iv) a
recapitalization, reorganization or other transaction involving the Corporation
that constitutes or results in a transfer of a majority of the voting rights or
equity interests in the Corporation to Persons other than holders of the
Corporation's voting equity securities prior to such transaction; or (v)
consummation of a "Rule 13e-3 transaction" as defined in Rule 13e-3 under the
Exchange Act with respect to the Corporation other than a Rule 13e-3 transaction
in which no Holder's interest in the Corporation has been adversely changed or
diluted in any material manner.

      "CLOSING PRICE" means, for any date, the price determined by the first of
the following clauses that applies: (a) if the Common Stock is then listed or
quoted on an Eligible Market or any other national securities exchange, the last
closing price per share of the Common Stock for such date (or the nearest
preceding date) on the primary Eligible Market or exchange on which the Common
Stock is then listed or quoted; (b) if prices for the Common Stock are then
quoted on the OTC Bulletin Board, the average of the highest closing bid price
and the lowest closing ask price per share of the Common Stock for such date (or
the nearest preceding date) so quoted; (c) if prices for the Common Stock are
then reported in the "Pink Sheets" published by the National Quotation Bureau
Incorporated (or a similar organization or agency succeeding to its functions of
reporting prices), the most recent bid price per share of the Common


                                       15

Stock so reported; or (d) in all other cases, the fair market value of a share
of Common Stock as determined by an independent appraiser selected in good faith
by a majority-in-interest of the Purchasers and the Corporation.

      "COMMISSION" means the Securities and Exchange Commission.

      "COMMON STOCK" means the common stock of the Corporation, par value $0.10
per share.

      "EFFECTIVE DATE" means the date that an Underlying Shares Registration
Statement is declared effective by the Commission.

      "ELIGIBLE MARKET" means the New York Stock Exchange, the American Stock
Exchange, the Nasdaq National Market or the Nasdaq SmallCap Market.

      "EVENT EQUITY VALUE" means 115% of the average of the Closing Prices for
the five Trading Days preceding the date of delivery of the notice requiring
payment of the Event Equity Value, provided that if the Corporation does not
make such required payment (together with any other payments, expenses and
liquidated damages then due and payable under the Transaction Documents) when
due or, in the event the Corporation disputes in good faith the occurrence of
the Triggering Event pursuant to which such notice relates, does not instead
deposit such required payment (together with such other payments, expenses and
liquidated damages then due) in escrow with an independent third-party escrow
agent within five Trading Days of the date such required payment is due, then
the Event Equity Value shall be 115% of the greater of (a) the average of the
Closing Prices for the five Trading Days preceding the date of delivery of the
notice requiring payment of the Event Equity Value and (b) the average of the
Closing Prices for the five Trading Days preceding the date on which such
required payment (together with such other payments, expenses and liquidated
damages) is paid in full.

      "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

      "EXCLUDED STOCK" means any shares of Common Stock issued or issuable: (A)
upon exercise, conversion or exchange of any Common Stock Equivalents described
in Schedule 3.1(g) to the Purchase Agreement (provided that such exercise or
conversion occurs in accordance with the terms thereof, without amendment or
modification, and that the applicable exercise or conversion price or ratio is
described in such schedule); (B) to officers, directors, employees or
consultants of the Corporation pursuant to a stock option plan, employee stock
purchase plan or other equity incentive plan approved by the Board of Directors
of the Corporation; (C) pursuant to as part of a bona fide firm commitment
underwritten public offering with a nationally recognized underwriter (including
any "at the market offering," as defined in Rule 415(a)(4) under the Securities
Act, only if such offering does not constitute an "equity line" and generates
aggregate gross proceeds of at least $50 million); (D) in connection with any
transaction with a strategic investor, vendor, lessor, customer, supplier,
marketing partner, developer or integrator or any similar arrangement, in each
case the primary purpose of which is not to raise equity capital; (E) in
connection with a transaction involving a merger or acquisition of an entity,
business or assets (not principally for the purpose of obtaining cash); or (F)
in connection with any other transaction for consideration other than cash up to
108,166 shares of Common Stock in the aggregate (as adjusted for stock splits,
stock combinations and similar events).

      "MATERIAL SUBSIDIARY" means any significant subsidiary, as defined in Rule
1-02(w) of Regulation S-X promulgated by the Commission, of the Corporation.

      "PERSON" means an individual or corporation, partnership, trust,
incorporated or unincorporated association, joint venture, limited liability
Corporation, joint stock Corporation, government (or an agency or subdivision
thereof) or other entity of any kind.


                                       16

      "PURCHASER" has the meaning set forth in the Purchase Agreement.

      "REGISTRATION RIGHTS AGREEMENT" means the Amended and Restated
Registration Rights Agreement, dated as of March 19, 2002 among the Corporation
and the Purchasers, as amended from time to time.

      "REQUIRED EFFECTIVENESS DATE" means the date on which an Underlying Shares
Registration Statement is required to become effective pursuant to the
Registration Rights Agreement.

      "RULE 144" means Rule 144 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same effect as such Rule.

      "SECURITIES" means the Shares, the Warrants and the Underlying Shares.

      "SECURITIES ACT" means the Securities Act of 1933, as amended.

      "SHARES" means, collectively, the shares of Series B-I Preferred Stock and
Series B-II Preferred Stock.

      "SUBSIDIARY" means any subsidiary, as defined in Rule 1-02(x) of
Regulation S-X promulgated by the Commission, of the Corporation.

      "TRADING DAY" means (a) any day on which the Common Stock is listed or
quoted and traded on its primary Trading Market or (b) if the Common Stock is
not then listed or quoted and traded on any Eligible Market, then a day on which
trading occurs on the New York Stock Exchange (or any successor thereto).

      "TRADING MARKET" means the Nasdaq National Market or any other Eligible
Market on which the Common Stock is then listed or quoted.

      "TRANSACTION DOCUMENTS" means the Purchase Agreement, the Registration
Rights Agreement, this Certificate of Designations and the Warrants.

      "TRIGGERING EVENT" means any of the following events: (a) immediately
prior to any Bankruptcy Event; (b) the Common Stock is not listed or quoted, or
is suspended from trading, on an Eligible Market for a period of five
consecutive Trading Days or ten aggregate Trading Days in any 365-day period;
(c) the Corporation fails for any reason to deliver a certificate evidencing any
Securities to a Purchaser within ten Trading Days after delivery of such
certificate is required pursuant to any Transaction Document or the exercise or
conversion rights of the Holders pursuant to the Transaction Documents are
otherwise suspended for any reason; (d) the Corporation fails to have available
both (i) a sufficient number of authorized but unissued and otherwise unreserved
shares of Common Stock available to issue Underlying Shares upon any exercise of
the Warrants or any conversion of Shares and does not make available a
sufficient number of authorized but unissued and otherwise unreserved shares of
Common Stock for such issuance within 60 days after the occurrence of such
deficiency and (ii) at least 6,401,394 authorized but unissued and otherwise
unreserved shares of Common Stock (as adjusted for any stock splits, stock
combinations or similar events), less reductions reasonably agreed to by the
Purchasers to reflect shares of Common Stock issued upon conversion of the
Shares (and, therefore, reduced aggregate dividend payments), as dividends on
the Shares, upon exercise of the Warrants or upon a redemption of the Shares;
(e) at any time after the Required Effectiveness Date, any Common Stock issuable
pursuant to the Transaction Documents is not listed on an Eligible Market; (f)
any other Event (as defined in the Registration Rights Agreement) occurs and
remains uncured for 60 days; (g) the Corporation fails to


                                       17

make any cash payment required under the Transaction Documents and such failure
is not cured within five days after notice of such default is first given to the
Corporation by a Purchaser; (h) the Corporation defaults in the timely
performance of any other obligation under the Transaction Documents and such
default continues uncured for a period of 20 days after the date on which notice
of such default is first given to the Corporation by a Purchaser (it being
understood that no prior notice need be given in the case of a default that
cannot reasonably be cured within 20 days), or (i) any Change of Control event.

      "UNDERLYING SHARES" means the shares of Common Stock issuable upon
conversion of, or in redemption of, the Shares, as payment of dividends on the
Shares and upon exercise of the Warrants, and any securities issued in exchange
for, or upon conversion or in respect of, such shares.

      "UNDERLYING SHARES REGISTRATION STATEMENT" means a registration statement
meeting the requirements set forth in the Registration Rights Agreement and
covering the resale of the Underlying Shares by the Purchasers.

      "VOLUME WEIGHTED AVERAGE PRICE" means, with respect to a Trading Day, the
average of the daily volume weighted average trading price (the total dollar
amount traded on each day divided by trading volume for such day) of the Common
Stock for the regular Trading Day session as reported at 4:15 p.m. (New York
time) as reported by Bloomberg, LP function key HP by using W to calculate the
daily weighted average.

      "WARRANTS" means the Common Stock purchase warrants, as amended from time
to time, issued pursuant to the Purchase Agreement.


                                       18

                                                                       EXHIBIT B

                            FORM OF CONVERSION NOTICE

(To be executed by the registered Holder
  in order to convert shares of Series B Preferred Stock)

      The undersigned hereby elects to convert the number of shares of Series B
Preferred Stock indicated below into shares of Common Stock of Aspen Technology,
Inc., a Delaware corporation, according to the conditions hereof, as of the date
written below.

                  Series of Series B Preferred Stock to be
                  converted (check):                           _____ Series B-I
                                                               _____ Series B-II

                  ______________________________________________________________
                  Date to effect conversion

                  ______________________________________________________________
                  Number and series of shares of Series B Preferred Stock owned
                  prior to conversion

                  ______________________________________________________________
                  Number and series of shares of Series B Preferred Stock to be
                  converted

                  ______________________________________________________________
                  Stated Value of shares of Series B Preferred Stock to be
                  converted (including $_______________ of dividends added under
                  Section 2(f) of the Registration Rights Agreement)

                  ______________________________________________________________
                  Number of shares of Common Stock to be issued

                  ______________________________________________________________
                  Applicable Conversion Price

                  ______________________________________________________________
                  Number and series of shares of Series B Preferred Stock
                  subsequent to conversion

                  ______________________________________________________________
                  Name of Holder


                  By:___________________________________________________________
                     Name:______________________________________________________
                     Title:_____________________________________________________


                                       19


                                                                     Exhibit 4.2

                             ASPEN TECHNOLOGY, INC.

                                 ---------------

                           CERTIFICATE OF DESIGNATIONS
                                       OF
                            SERIES C PREFERRED STOCK

        (Pursuant to Section 151 of the Delaware General Corporation Law)

                                 ---------------

      Aspen Technology, Inc., a Delaware corporation (the "Corporation"), in
accordance with the provisions of Section 103 of the Delaware General
Corporation Law (the "DGCL") does hereby certify that, in accordance with
Section 141(c) of the DGCL, the following resolution was duly adopted by the
Board of Directors of the Corporation as of March 14, 2002:

      RESOLVED, that a series of Preferred Stock, Series C Preferred Stock, par
value $0.10 per share, of the Corporation is hereby created and the designation,
number of shares, powers, preferences, rights, qualifications, limitations and
restrictions thereof (in addition to any provisions set forth in the Certificate
of Incorporation of the Corporation which are applicable to the Preferred Stock
of all classes and series) are as follows:

                            SERIES C PREFERRED STOCK

      1. Designation, Amount, Par Value and Stated Value. The following series
of preferred stock shall be designated as the Corporation's Series C Preferred
Stock (the "SERIES C PREFERRED STOCK"), and the number of shares so designated
shall be 60,000. Each share of Series C Preferred Stock shall have a par value
of $0.10 per share and a stated value equal to $10,000 plus any amount added to
the Stated Value pursuant to Section 3(b) hereof (the "STATED VALUE").

      2. Definitions. In addition to the terms defined elsewhere in this
Certificate of Designations, the following terms have the meanings indicated:

            "CHANGE OF CONTROL" means the occurrence of any of the following in
      one or a series of related transactions: (i) an acquisition after the date
      hereof by an individual or legal entity or "group" (as described in Rule
      13d-5(b)(1) under the Exchange Act) of a majority of the voting rights or
      equity interests in the Corporation; (ii) a replacement of more than
      one-half of the members of the Corporation's Board of Directors that is
      not approved by those individuals who are members of the Board of
      Directors as of March 19, 2002 (or other directors previously approved by
      such individuals); (iii) a merger or consolidation of the Corporation or a
      sale of all or substantially all of the assets of the Corporation in one
      or a series of related transactions, unless following such transaction or
      series of transactions, the holders of the Corporation's securities prior
      to the first such transaction continue to hold, directly or indirectly, at
      least a majority of the voting rights and equity interests in the
      surviving entity or acquirer of such assets; (iv) a recapitalization,
      reorganization or other transaction involving the Corporation that
      constitutes or results in a transfer of a majority of the voting rights or
      equity interests in the Corporation to Persons other than holders of the
      Corporation's voting equity securities prior to such transaction; or (v)
      consummation of a "Rule 13e-3 transaction" as defined in Rule 13e-3 under
      the Exchange Act with respect to the Corporation other than a Rule 13e-3
      transaction in which no Holder's interest in the Corporation has been
      adversely changed or diluted in any material manner.

            "COMMON STOCK" means the common stock of the Corporation, par value
      $0.10 per share.

            "ELIGIBLE MARKET" means the New York Stock Exchange, the American
      Stock Exchange, the Nasdaq National Market or the Nasdaq SmallCap Market.

            "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
      amended.

            "HOLDER" means any holder of Series C Preferred Stock.

            "JUNIOR SECURITIES" means the Common Stock and all other equity or
      equity equivalent securities of the Corporation.

            "PERSON" means an individual or corporation, partnership, trust,
      incorporated or unincorporated association, joint venture, limited
      liability corporation, joint stock corporation, government (or an agency
      or subdivision thereof) or other entity of any kind.

            "TRADING DAY" means (a) any day on which the Common Stock is listed
      or quoted and traded on its primary Trading Market or (b) if the Common
      Stock is not then listed or quoted and traded on any Eligible Market, then
      a day on which trading occurs on the New York Stock Exchange (or any
      successor thereto).

            "TRADING MARKET" means the Nasdaq National Market or any other
      Eligible Market on which the Common Stock is then listed or quoted.

      3. Dividends.

            (a) Holders shall be entitled to receive, out of funds legally
available therefor, and the Corporation shall pay, cumulative dividends on the
Series C Preferred Stock at the rate per share (as a percentage of the Stated
Value per share) of 12% per annum, payable quarterly in arrears commencing on
the last day of each month, except if such date is not a Trading Day, in which
case such dividend shall be payable on the next succeeding Trading Day (each, a
"DIVIDEND PAYMENT DATE"). Dividends on a share of Series C Preferred Stock shall
be calculated on the basis of a 365-day year, shall accrue daily commencing on
the such share is initially issued by the Corporation for such share, and shall
be deemed to accrue from such date whether or not earned or declared and whether
or not there are profits, surplus or other funds of the Corporation legally
available for the payment of dividends.

            (b) Subject to the conditions and limitations set forth below, the
Corporation may pay required dividends (i) in cash or (ii) by an addition to the
Stated Value. The Corporation must deliver written notice (the "DIVIDEND
NOTICE") to the Holders indicating the manner in which it intends to pay
dividends at least ten Trading Days prior to each Dividend Payment Date, but the
Corporation may indicate in any such notice that the election contained therein
shall continue for subsequent Dividend Payment Dates until revised. Failure to
timely provide such written notice shall be deemed an election by the
Corporation to pay the dividend by addition to the Stated Value. All dividends
payable in respect of the Series C Preferred Stock on any Dividend Payment Date
must be paid in the same manner. If the Corporation may not legally pay
dividends on any Dividend Payment Date, such amount shall be added to the Stated
Value as of such Dividend Payment Date.

            (c) So long as any Series C Preferred Stock is outstanding, (i)
neither the Corporation nor any subsidiary (as defined in Rule 1-02(x) of
Regulation S-X promulgated by the Securities and Exchange Commission) of the
Corporation shall, directly or indirectly, redeem, purchase or otherwise acquire
any Junior Securities or set aside any monies for such a redemption, purchase or
other acquisition and (ii) the Corporation shall not pay or declare any dividend
or make any distribution on any Junior Securities, except pro rata stock
dividends on the Common Stock payable in additional shares of Common Stock and
dividends due and paid in the ordinary course on preferred stock of the
Corporation,


                                       2

in each case only at such times as the Corporation is in compliance with its
payment and other obligations hereunder.

      4. Registration of Series C Preferred Stock. The Corporation shall
register shares of the Series C Preferred Stock, upon records to be maintained
by the Corporation for that purpose (the "SERIES C PREFERRED STOCK REGISTER"),
in the name of the record Holders thereof from time to time. The Corporation may
deem and treat the record Holder of shares of Series C Preferred Stock as the
absolute owner thereof for the purpose of any conversion hereof or any
distribution to such Holder, and for all other purposes, absent actual notice to
the contrary.

      5. Registration of Transfers. The Corporation shall register the transfer
of any shares of Series C Preferred Stock in the Series C Preferred Stock
Register, upon surrender of certificates evidencing such shares to the
Corporation at its address specified herein. Upon any such registration or
transfer, a new certificate evidencing the shares of Series C Preferred Stock so
transferred shall be issued to the transferee and a new certificate evidencing
the remaining portion of the shares not so transferred, if any, shall be issued
to the transferring Holder.

      6. Liquidation.

            (a) In the event of any liquidation, dissolution or winding up of
the Corporation, either voluntary or involuntary (a "LIQUIDATION EVENT"), the
Holders of Series C Preferred Stock shall be entitled to receive, prior and in
preference to any distribution of any of the assets or surplus funds of the
Corporation to the holders of Junior Securities by reason of their ownership
thereof, an amount per share in cash equal to the Stated Value for each share of
Series C Preferred Stock then held by them (as adjusted for any stock splits,
stock dividends, stock combinations and similar transactions with respect to the
Series C Preferred Stock), plus all accrued but unpaid dividends on such Series
C Preferred Stock as of the date of such event (the "SERIES C STOCK LIQUIDATION
PREFERENCE"). If, upon the occurrence of a Liquidation Event, the assets and
funds thus distributed among the Holders of the Series C Preferred Stock shall
be insufficient to permit the payment to such Holders of the full Series C Stock
Liquidation Preference, then the entire assets and funds of the Corporation
legally available for distribution shall be distributed ratably among the
Holders of the Series C Preferred Stock in proportion to the aggregate Series C
Stock Liquidation Preference that would otherwise be payable to each of such
Holders.

            (b) In the event of a Liquidation Event, following completion of the
distributions required by the first sentence of paragraph (a) of this Section 6,
if assets or surplus funds remain in the Corporation, the holders of Junior
Securities shall share ratably in all remaining assets of the Corporation.

            (c) The Corporation shall mail written notice of any Liquidation
Event to each record Holder not less than 20 Trading Days prior to the payment
date or effective date thereof.

      7. Redemption Rights.

            (a) The Corporation may, at its option, redeem all or any number of
the shares of Series C Preferred Stock then outstanding at any time or from time
to time, upon at least 15 Trading Days' advance notice to the Holders (the
"REDEMPTION NOTICE"), at a price per share (the "REDEMPTION PRICE") equal to the
Stated Value of such share plus all accrued but unpaid dividends thereon to the
date fixed for redemption. The Redemption Notice shall specify the date fixed
for redemption, the aggregate Redemption Price for all of the shares to be
redeemed, and the aggregate number of shares to be redeemed. The Redemption
Price for any share of Series C Preferred Stock shall be paid entirely in cash.

            (b) In case of any redemption of fewer than all of the
then-outstanding shares of Series C Preferred Stock, the shares to be redeemed
shall be selected, as nearly as practicable, as follows:


                                       3

                  (i) The aggregate Redemption Price shall be prorated among the
      record Holders in proportion to the aggregate Stated Values (computed as
      of the date fixed for redemption) of the shares of Series C Preferred
      Stock registered in their respective names in the Series C Preferred Stock
      Register.

                  (ii) The Redemption Price so prorated to a record Holder shall
      be applied to redeem shares of Series C Preferred Stock in order of
      descending per share Stated Value, such that the Redemption Price prorated
      to such record Holder is first applied to the redemption of the record
      Holder's shares having the highest per share Stated Value, any remaining
      prorated Redemption Price is then applied to the redemption of the record
      Holder's shares having the next highest per share Stated Value, and so
      forth, until all the Redemption Price prorated to such record Holder has
      been applied to the redemption of whole shares of such record Holder's
      Series C Preferred Stock. No share of Series C Preferred Stock shall be
      subject to redemption in part.

                  (iii) The Redemption Notice delivered to a Holder shall
      specify, in addition to the information specified in Section 7(a), the
      number of shares of such Holder to be redeemed and the certificate
      number(s) of the certificate(s) evidencing those shares.

            (c) Upon receipt of payment of the Redemption Price, each Holder
shall deliver the original certificate(s) evidencing the Series C Preferred
Stock so redeemed to the Corporation, unless such Holder is awaiting receipt of
a new certificate evidencing such shares from the Corporation pursuant to
another provision hereof. Upon receipt of such a certificate from a Holder, the
Corporation shall issue to such Holder a new certificate evidencing the
remaining shares of Series C Preferred Stock, if any, represented by such
certificate but not redeemed.

            (d) Any shares of Series C Preferred Stock redeemed in accordance
with this Section 7 shall be retired and cancelled and shall not be reissued,
and the Corporation (without the need for stockholder action) may from time to
time take such appropriate action as may be necessary to reduce the authorized
number of shares of Series C Preferred Stock accordingly.

      8. Voting Rights.

            (a) Except as otherwise provided herein or as required by applicable
law, the Holders of the Series C Preferred Stock shall not be entitled to vote
on any matters on which holders of Common Stock are entitled to vote.

            (b) So long as any shares of Series C Preferred Stock are
outstanding, the Corporation shall not, without the affirmative vote of the
Holders of a majority of the shares of Series C Preferred Stock then
outstanding, (i) alter or change adversely the powers, preferences or rights
given to the Series C Preferred Stock or alter or amend this Certificate of
Designations (whether by merger, reorganization, consolidation or otherwise),
(ii) authorize or create any class of stock ranking as to dividends or
distribution of assets upon a Liquidation Event senior to the Series C Preferred
Stock, (iii) amend its certificate of incorporation or bylaws so as to affect
adversely any rights of the Holders (whether by merger, reorganization,
consolidation or otherwise), (iv) increase the authorized number of shares of
Series C Preferred Stock, or (v) enter into any agreement with respect to the
foregoing.

      So long as any shares of Series C Preferred Stock are outstanding, (i) the
record Holders of Series C Preferred Stock, exclusively and as a separate class,
shall be entitled to elect a number of directors equal to the greater of (A) two
or (B) 20% of the total number of directors of the Corporation, rounded up to
the nearest whole number, and (ii) the record holders of Common Stock,
exclusively and as a separate class, shall, subject to the rights of any
additional series of Preferred Stock that may be established from time to time,
be entitled to elect the balance of the total number of directors of the
Corporation. At any meeting


                                       4

held for the purpose of electing directors, the presence in person or by proxy
of the Holders of a majority of the shares of Series C Preferred Stock then
outstanding shall constitute a quorum of the Series C Preferred Stock for the
purpose of electing directors by Holders. A vacancy in any directorship filled
by the Holders shall be filled only by vote or written consent in lieu of a
meeting of the Holders or by any remaining director or directors elected by the
Holders pursuant to this Section 8(c). To the extent all outstanding shares of
Series C Preferred Stock are redeemed at any time in accordance with the
provisions of Section 7 hereof, the rights of the Holders under this Section
8(c) shall terminate on the redemption date for those shares and any director
previously elected by the Holders pursuant to this Section 8(c) resign as of
such redemption date.

      9. Certain Transactions.

            (a) If, at any time while Series C Preferred Stock is outstanding,
the Corporation proposes to enter into a transaction that would constitute a
Change of Control, the Corporation shall mail written notice of the proposed
Change of Control transaction to each record Holder not less than 20 Trading
Days prior to the effective date thereof. Each Holder shall have the right to
receive on the date of the consummation of such Change of Control, at the
election of the Corporation, either (i) for each share of Series C Preferred
Stock, cash in an amount equal to the Stated Value plus all accrued but unpaid
dividends thereon through the date of payment, or (ii) a new series of preferred
stock in the successor corporation or surviving entity in the Change of Control
with a stated value equal to the Stated Value of the Series C Preferred Stock,
plus all accrued but unpaid dividends thereon, and consistent with terms
substantially equivalent to the terms of the Series C Preferred Stock held by
such Holder and evidencing the Holder's right to convert such preferred stock
into the consideration described in clause (i) of this Section 9. To the extent
the Corporation elects to have the successor to the Corporation or the surviving
entity issue a new series of preferred stock, the terms of any agreement
pursuant to which a Change of Control is effected shall include terms requiring
any such successor or surviving entity to comply with the provisions
substantially equivalent to the provisions of this Section 9 and providing that
the Series C Preferred Stock (or any such replacement security) will be
similarly adjusted upon any subsequent transaction analogous to a Change of
Control.

            (b) Any recapitalization, reorganization, reclassification,
consolidation, merger, sale of all or substantially all of the Corporation's
assets to another Person or other transaction which is effected in such a way
that holders of Common Stock are entitled to receive (either directly or upon
subsequent liquidation) stock, securities or assets with respect to or in
exchange for Common Stock is referred to herein as "ORGANIC CHANGE." Prior to
the consummation of any (i) sale of all or substantially all of the
Corporation's assets to an acquiring Person or (ii) other Organic Change
following which the Corporation is not a surviving entity, other than in each
case an Organic Change that is a Change of Control (which shall be subject to
Section 9(a), the Corporation will secure from the Person purchasing such assets
or the successor, or, if applicable, the parent of the successor, resulting from
such Organic Change (in each case, the "ACQUIRING ENTITY") a written agreement
(in form and substance reasonably satisfactory to the holders of at least a
majority of the shares of Series C Preferred Stock then outstanding) to deliver
to each holder of Series C Preferred Stock in exchange for such shares, a
security of the Acquiring Entity evidenced by a written instrument substantially
similar in form and substance to the Series C Preferred Stock, including,
without limitation, having a stated value and liquidation preference equal to
the Stated Value and the Series C Stock Liquidation Preference of the Series C
Preferred Stock held by such holder, and reasonably satisfactory to the holders
of at least a majority of the Series C Preferred Stock then outstanding.

      10. Charges, Taxes and Expenses. Issuance of certificates for shares of
Series C Preferred Stock shall be made without charge to the Holders for any
issue or transfer tax, withholding tax, transfer agent fee or other incidental
tax or expense in respect of the issuance of such certificates, all of which
taxes and


                                       5

expenses shall be paid by the Corporation; provided, however, that the
Corporation shall not be required to pay any tax that may be payable in respect
of any transfer involved in the registration of any certificates for Series C
Preferred Stock in a name other than that of the Holder. The Holder shall be
responsible for all other tax liability that may arise as a result of holding or
transferring the Series C Preferred Stock.

      11. Replacement Certificates. If any certificate evidencing Series C
Preferred Stock is mutilated, lost, stolen or destroyed, the Corporation shall
issue or cause to be issued in exchange and substitution for and upon
cancellation hereof, or in lieu of and substitution for such certificate, a new
certificate, but only upon receipt of evidence reasonably satisfactory to the
Corporation of such loss, theft or destruction and customary and reasonable
indemnity, if requested. Applicants for a new certificate under such
circumstances shall also comply with such other reasonable regulations and
procedures and pay such other reasonable third-party costs as the Corporation
may prescribe.

      12. Notices. Any and all notices or other communications or deliveries
hereunder shall be in writing and shall be deemed given and effective on the
earliest of (i) the date of transmission, if such notice or communication is
delivered via facsimile at the facsimile number specified in this Section prior
to 5:30 p.m. (New York City time) on a Trading Day, (ii) the next Trading Day
after the date of transmission, if such notice or communication is delivered via
facsimile at the facsimile number specified in this Section on a day that is not
a Trading Day or later than 5:30 p.m. (New York City time) on any Trading Day,
(iii) the Trading Day following the date of mailing, if sent by nationally
recognized overnight courier service, or (iv) upon actual receipt by the party
to whom such notice is required to be given. The addresses for such
communications shall be: (i) if to the Corporation, to Ten Canal Park,
Cambridge, Massachusetts 02141, facsimile: (617) 949-1722, Attention: Chief
Executive Officer and General Counsel, or (ii) if to a Holder, to the address or
facsimile number appearing on the Corporation's stockholder records or such
other address or facsimile number as such Holder may provide to the Corporation
in accordance with this Section 11.

      13. Miscellaneous.

            (a) The headings herein are for convenience only, do not constitute
a part of this Certificate of Designations and shall not be deemed to limit or
affect any of the provisions hereof.

            (b) Any of the rights of the Holders of Series C Preferred Stock set
forth herein may be waived by the affirmative vote of the Holders of a majority
of the shares of Series C Preferred Stock then outstanding. No waiver of any
default with respect to any provision, condition or requirement of this
Certificate of Designations shall be deemed to be a continuing waiver in the
future or a waiver of any subsequent default or a waiver of any other provision,
condition or requirement hereof, nor shall any delay or omission of either party
to exercise any right hereunder in any manner impair the exercise of any such
right.

                                      * * *


                                       6

      IN WITNESS WHEREOF, Aspen Technology, Inc. has caused this Certificate of
Designations to be duly executed as of March 19, 2002.

                                                  ASPEN TECHNOLOGY, INC.


                                                  By: /s/ Lisa W. Zappala
                                                      --------------------------
                                                      Lisa W. Zappala
                                                      Senior Vice President and
                                                         Chief Financial Officer


                                       7


                                                                    Exhibit 99.1

                              AMENDED AND RESTATED
                          SECURITIES PURCHASE AGREEMENT

      This Amended and Restated Securities Purchase Agreement (this "Agreement")
is dated as of March 19, 2002, among Aspen Technology, Inc., a Delaware
corporation (the "Company"), and the purchasers identified on the signature
pages hereto (each a "Purchaser" and collectively the "Purchasers").

      WHEREAS, the Company and the Purchasers entered into a Securities Purchase
Agreement, dated as of February 6, 2002 (the "Original Purchase Agreement")
pursuant to which the Company issued and sold to the Purchasers, and the
Purchasers purchased, shares of the Company's Series B-1 Convertible Preferred
Stock and Series B-2 Convertible Preferred Stock and warrants to purchase shares
of Common Stock of the Company on February 6, 2002 and February 28, 2002,

      WHEREAS, as of the date hereof, the Company has authorized the following
new series of its Preferred Stock, par value $.10 per share: (i) Series B-I
Convertible Preferred Stock and (ii) Series B-II Convertible Preferred Stock,

      WHEREAS, the Company and the Purchasers wish to exchange at the Third
Closing (as defined below) being held contemporaneously with the execution and
delivery of this Agreement, upon the terms and conditions set forth in this
Agreement, (i) an aggregate of 30,000 shares of Series B-1 Preferred Stock for
an aggregate of 30,000 shares of Series B-I Preferred Stock and (ii) an
aggregate of 20,000 shares of Series B-2 Preferred Stock for an aggregate of
20,000 shares of Series B-II Preferred Stock,

      WHEREAS, each of the exchange of shares of Series B-1 Convertible
Preferred Stock for shares of Series B-I Convertible Preferred Stock and the
exchange of shares of Series B-2 Convertible Preferred Stock for shares of
Series B-II Convertible Preferred Stock is being made in reliance upon an
exemption from registration provided by the Securities Act of 1933, as amended,
and

      WHEREAS, the Company and the Purchasers desire to provide for the issuance
to certain of the Purchasers of an additional 10,000 shares of Series B-I
Convertible Preferred Stock and Warrants exercisable for shares of Common Stock
at a Third Closing.

      NOW, THEREFORE, IN CONSIDERATION of the mutual covenants contained in this
Agreement, and for other good and valuable consideration the receipt and
adequacy of which are hereby acknowledged, the Company and the Purchasers agree
that the terms of the Original Purchase Agreement shall be amended and restated
as follows as if so amended and restated as of the date of the Original Purchase
Agreement:

                                    ARTICLE I
                                   DEFINITIONS

      1.1 Definitions. In addition to the terms defined elsewhere in this
Agreement, the following terms have the meanings indicated:

      "ACTUAL MINIMUM" means, as of any date, the maximum aggregate number of
shares of Common Stock then issued or potentially issuable in the future
pursuant to the Transaction Documents, including any Underlying Shares issuable
upon exercise or conversion in full of all Warrants and Shares, ignoring any
limits on the number of shares of Common Stock that may be owned by a Purchaser
at any one time and (i) assuming that (a) any previously unconverted Shares are
held until the seventh anniversary of the Closing Date and all dividends therein
are paid in shares of Common Stock, and (b) the Closing Price at all times on
and after the date of determination equals 100% of the actual Closing Price on
the Trading Day immediately prior to the date of determination, and (ii) giving
effect to the Conversion Price (as defined in the Series B Certificate of
Designations) as in effect on such date, without regard to potential changes in
the Closing Price that may occur thereafter.

      "AFFILIATE" means any Person that, directly or indirectly through one or
more intermediaries, controls or is controlled by or is under common control
with a Person, as such terms are used in and construed under Rule 144. With
respect to a Purchaser, any investment fund or managed account that is managed
on a discretionary basis by the same investment manager as such Purchaser will
be deemed to be an Affiliate of such Purchaser.

      "BANKRUPTCY EVENT" means any of the following events: (a) the Company or
any Material Subsidiary commences a case or other proceeding under any
bankruptcy, reorganization, arrangement, adjustment of debt, relief of debtors,
dissolution, insolvency or liquidation or similar law of any jurisdiction
relating to the Company or any Material Subsidiary thereof; (b) there is
commenced against the Company or any Material Subsidiary any such case or
proceeding that is not dismissed within 60 days after commencement; (c) the
Company or any Material Subsidiary is adjudicated insolvent or bankrupt or any
order of relief or other order approving any such case or proceeding is entered;
(d) the Company or any Material Subsidiary suffers any appointment of any
custodian or the like for it or any substantial part of its property that is not
discharged or stayed within 60 days; (e) the Company or any Material Subsidiary
makes a general assignment for the benefit of creditors; (f) the Company or any
Material Subsidiary fails to pay, or states in writing that it is unable to pay
or is unable to pay, its debts generally as they become due; or (g) the Company
or any Subsidiary, by any act or failure to act, expressly indicates its consent
to, approval of or acquiescence in any of the foregoing or takes any corporate
or other action that effects any of the foregoing.

      "CHANGE OF CONTROL" means the occurrence of any of the following in one or
a series of related transactions: (i) an acquisition after the date hereof by an
individual or legal entity or "group" (as described in Rule 13d-5(b)(1) under
the Exchange Act) of a majority of the voting rights or equity interests in the
Company; (ii) a replacement of more than one-half of the members of the
Company's Board of Directors that is not approved by those individuals who are
members of the Board of Directors on the date hereof (or other directors
previously approved by such individuals); (iii) a merger or consolidation of the
Company or a sale of all or substantially all of the assets of the Company in
one or a series of related transactions, unless following such transaction or
series of transactions, the holders of the Company's securities prior to the
first such transaction continue to hold, directly or indirectly, at least a
majority of the voting rights and equity interests in the surviving entity or
acquirer of such assets; (iv) a recapitalization, reorganization or other
transaction involving the Company that constitutes or results in a transfer of a
majority of the voting rights or equity interests in the Company to Persons
other than holders


                                       2

of the Company's voting equity securities prior to such transaction; or (v)
consummation of a "Rule 13e-3 transaction" as defined in Rule 13e-3 under the
Exchange Act with respect to the Company other than a Rule 13e-3 transaction in
which no Purchaser's interest in the Company has been adversely changed or
diluted in any material manner.

      "CLOSING" means First Closing, Second Closing and/or Third Closing, as
applicable.

      "CLOSING DATE" means, with respect to the First Closing, the date of the
First Closing, with respect to the Second Closing, the date of the Second
Closing, and with respect to the Third Closing, the date of the Third Closing.

      "CLOSING PRICE" means, for any date, the price determined by the first of
the following clauses that applies: (a) if the Common Stock is then listed or
quoted on an Eligible Market or any other national securities exchange, the last
closing price per share of the Common Stock for such date (or the nearest
preceding date) on the primary Eligible Market or exchange on which the Common
Stock is then listed or quoted; (b) if prices for the Common Stock are then
quoted on the OTC Bulletin Board, the average of the highest closing bid price
and the lowest closing ask price per share of the Common Stock for such date (or
the nearest preceding date) so quoted; (c) if prices for the Common Stock are
then reported in the "Pink Sheets" published by the National Quotation Bureau
Incorporated (or a similar organization or agency succeeding to its functions of
reporting prices), the most recent bid price per share of the Common Stock so
reported; or (d) in all other cases, the fair market value of a share of Common
Stock as determined by an independent appraiser selected in good faith by a
majority-in-interest of the Purchasers and the Company.

      "COMMISSION" means the Securities and Exchange Commission.

      "COMMON STOCK" means the common stock of the Company, par value $0.10 per
share.

      "COMMON STOCK EQUIVALENTS" means, collectively, shares of Common Stock and
Convertible Securities.

      "COMPANY COUNSEL" means Hale and Dorr LLP, counsel to the Company.

      "CONVERTIBLE SECURITIES" means any evidence of indebtedness, shares,
options, warrants or other securities directly or indirectly convertible into or
exercisable or exchangeable for shares of Common Stock.

      "EFFECTIVE DATE" means the date that an Underlying Shares Registration
Statement is declared effective by the Commission.

      "ELIGIBLE MARKET" means the New York Stock Exchange, the American Stock
Exchange, the Nasdaq National Market or the Nasdaq SmallCap Market.

      "EVENT EQUITY VALUE" means 115% of the average of the Closing Prices for
the five Trading Days preceding the date of delivery of the notice requiring
payment of the Event Equity Value, provided that if the Company does not make
such required payment (together with any other payments, expenses and liquidated
damages then due and payable under the Transaction


                                       3

Documents) when due or, in the event the Company disputes in good faith the
occurrence of the Triggering Event pursuant to which such notice relates, does
not instead deposit such required payment (together with such other payments,
expenses and liquidated damages then due) in escrow with an independent
third-party escrow agent within five Trading Days of the date such required
payment is due, then the Event Equity Value shall be 115% of the greater of (a)
the average of the Closing Prices for the five Trading Days preceding the date
of delivery of the notice requiring payment of the Event Equity Value and (b)
the average of the Closing Prices for the five Trading Days preceding the date
on which such required payment (together with such other payments, expenses and
liquidated damages) is paid in full.

      "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

      "EXCLUDED STOCK" means any shares of Common Stock issued or issuable (a)
upon exercise, conversion or exchange of any Common Stock Equivalents described
in Schedule 3.1(g) (provided that such exercise or conversion occurs in
accordance with the terms thereof, without amendment or modification, and that
the applicable exercise or conversion price or ratio is described in such
schedule); (b) to officers, directors, employees or consultants of the Company
pursuant to a stock option plan, employee stock purchase plan or other equity
incentive plan approved by the Board of Directors of the Company; (c) pursuant
to as part of a bona fide firm commitment underwritten public offering with a
nationally recognized underwriter (including any "at the market offering," as
defined in Rule 415(a)(4) under the Securities Act, only if such offering does
not constitute an "equity line" and generates aggregate gross proceeds of at
least $50,000,000); (d) in connection with any transaction with a strategic
investor, vendor, lessor, customer, supplier, marketing partner, developer or
integrator or any similar arrangement, in each case the primary purpose of which
is not to raise equity capital; (e) in connection with a transaction involving a
merger or acquisition of an entity, business or assets (not principally for the
purpose of obtaining cash); or (f) in connection with any other transaction for
consideration other than cash up to 108,166 shares of Common Stock in the
aggregate (as adjusted for stock splits, stock combinations and similar events).

      "FIRST CLOSING" means the closing of the purchase and sale of the
Securities pursuant to Section 2.4(a).

      "INITIAL SERIES B CERTIFICATE OF DESIGNATIONS" means the certificate of
designations of the Series B-1 Preferred Stock and Series B-2 Preferred Stock,
in the form of Exhibit A-1.

      "INITIAL SHARES" means the shares of Series B-1 Preferred Stock, which are
being purchased by the Purchasers at the First Closing.

      "LOSSES" means any and all losses, claims, damages, liabilities,
settlement costs and expenses, including without limitation costs of preparation
of legal action and reasonable attorneys' fees.

      "MATERIAL SUBSIDIARY" means any significant subsidiary, as defined in Rule
1-02(w) of Regulation S-X promulgated by the Commission, of the Company.


                                       4

      "PERSON" means an individual or corporation, partnership, trust,
incorporated or unincorporated association, joint venture, limited liability
company, joint stock company, government (or an agency or subdivision thereof)
or other entity of any kind.

      "PREFERRED STOCK" means, collectively, the Series B-1 Preferred Stock,
Series B-2 Preferred Stock, the Series B-I Preferred Stock and Series B-II
Preferred Stock.

      "PROCEEDING" means an action, claim, suit, investigation or proceeding
(including, without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

      "PURCHASER COUNSEL" means Proskauer Rose LLP, counsel to the Purchasers.

      "QUALIFIED TRANSFER" means the assignment of rights by a Purchaser under
this Agreement and the Registration Rights Agreement to any Person to whom such
Purchaser assigns or transfers Series C Preferred Stock or Securities
convertible into or exercisable for Underlying Shares having an aggregate value
of at least $5,000,000 and who agrees to be bound by the provisions of this
Agreement and the Registration Rights Agreement; provided, however, a Purchaser
shall have the right (a) together with any transferee of such Purchaser, to
assign Series C Preferred Stock or Securities in any amount up to two transfers
a year in the aggregate, (b) to assign without limitation to any Affiliate, any
other Purchaser or any Affiliate of any other Purchaser and (c) to assign
without limitation pursuant to a pledge in connection with a bona fide margin
account or other loan secured by such Securities. For the purposes of
calculating value pursuant to the preceding sentence, the value of each
Underlying Share shall be deemed to equal the Closing Price of the Common Stock
on the Trading Day immediately prior to the effective date of such assignment,
less the Exercise Price per share of any Underlying Share that is a Warrant
Share, but not less than the Stated Value.

      "REGISTRATION RIGHTS AGREEMENT" means (a) with respect to the period prior
to the time of the Third Closing, the Registration Rights Agreement, dated as of
February 6, 2002, among the Company and the Purchasers and (b) upon and after
the time of the Third Closing, such Registration Rights Agreement as amended and
restated in the form of Exhibit B.

      "REQUIRED EFFECTIVENESS DATE" means the date on which an Underlying Shares
Registration Statement is required to become effective pursuant to the
Registration Rights Agreement.

      "REQUIRED MINIMUM" means, as of any date, the maximum aggregate number of
shares of Common Stock then issued or potentially issuable in the future
pursuant to the Transaction Documents, including any Underlying Shares issuable
upon exercise or conversion in full of all Warrants and Shares, ignoring any
limits on the number of shares of Common Stock that may be owned by a Purchaser
at any one time and assuming that (a) any previously unconverted Shares are held
until the seventh anniversary of the Closing Date or, if earlier, until
maturity, and all dividends thereon are paid in shares of Common Stock, (b) the
Closing Price at all times on and after the date of determination equals 75% of
the actual Closing Price on the Trading Day immediately prior to the date of
determination and (c) giving effect to the Conversion Price (as defined, with
respect to the period before the time of the Third Closing, in the Initial
Series B


                                       5

Certificate of Designations and, upon and after the time of the Third Closing,
in the Series B Certificate of Designations) as in effect on such date, without
regard to potential changes in the Closing Price that may occur thereafter.

      "RULE 144" means Rule 144 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same effect as such Rule.

      "SECOND CLOSING" means the closing of the purchase and sale of the
Securities pursuant to Section 2.4(b).

      "SECOND CLOSING SHARES" means the shares of Series B-2 Preferred Stock
which are being purchased by the Purchasers at the Second Closing.

      "SECURITIES" means the Shares, the Warrants and the Underlying Shares.

      "SECURITIES ACT" means the Securities Act of 1933, as amended.

      "SERIES B CERTIFICATE OF DESIGNATIONS" means a certificate of designations
of the Series B-I Preferred Stock and Series B-II Preferred Stock, in the form
of Exhibit A-2.

      "SERIES B-1 PREFERRED STOCK" means the Series B-1 Convertible Preferred
Stock of the Company, which is convertible into shares of Common Stock.

      "SERIES B-2 PREFERRED STOCK" means the Series B-2 Convertible Preferred
Stock of the Company, which is convertible into shares of Common Stock.

      "SERIES B-I PREFERRED STOCK" means the Series B-I Convertible Preferred
Stock of the Company, which is convertible into shares of Common Stock.

      "SERIES B-II PREFERRED STOCK" means the Series B-II Convertible Preferred
Stock of the Company, which is convertible into shares of Common Stock.

      "SERIES C CERTIFICATE OF DESIGNATIONS" means a certificate of designations
of the Series C Preferred Stock, in the form of Exhibit A-3.

      "SERIES C PREFERRED STOCK" means the Series C Preferred Stock of the
Company.

      "SHARES" means, collectively, (a) the Initial Shares or, upon and after
the time of the Third Closing, the shares of Series B-I Preferred Stock issued
upon exchange of the Initial Shares, (b) the Second Closing Shares or, upon and
after the time of the Third Closing, the shares of Series B-II Preferred Stock
issued upon exchange of the Second Closing Shares, and (c) the Third Closing
Shares.

      "SUBSEQUENT PLACEMENT" shall have the meaning specified in Section 4.7(a).

      "SUBSIDIARY" means any subsidiary, as defined in Rule 1-02(x) of
Regulation S-X promulgated by the Commission, of the Company.


                                       6

      "THIRD CLOSING" means the closing of the purchase and sale of the
Securities pursuant to Section 2.4(c).

      "THIRD CLOSING SHARES" means the shares of Series B-I Preferred Stock
which are being purchased by the Purchasers at the Third Closing.

      "TRADING DAY" means (a) any day on which the Common Stock is listed or
quoted and traded on its primary Trading Market or (b) if the Common Stock is
not then listed or quoted and traded on any Eligible Market, then a day on which
trading occurs on the New York Stock Exchange (or any successor thereto).

      "TRADING MARKET" means the Nasdaq National Market or any other Eligible
Market on which the Common Stock is then listed or quoted.

      "TRANSACTION DOCUMENTS" means this Agreement, the Registration Rights
Agreement, the Series B Certificate of Designations (or, with respect to the
period before the time of the Third Closing, the Initial Series B Certificate of
Designations), the Series C Certificate of Designations and the Warrants.

      "TRIGGERING EVENT" means any of the following events: (a) immediately
prior to any Bankruptcy Event; (b) the Common Stock is not listed or quoted, or
is suspended from trading, on an Eligible Market for a period of five
consecutive Trading Days or ten aggregate Trading Days in any 365-day period;
(c) the Company fails for any reason to deliver a certificate evidencing any
Securities to a Purchaser within ten Trading Days after delivery of such
certificate is required pursuant to any Transaction Document or the exercise or
conversion rights of the Holders pursuant to the Transaction Documents are
otherwise suspended for any reason; (d) the Company fails to have available both
(i) a sufficient number of authorized but unissued and otherwise unreserved
shares of Common Stock available to issue Underlying Shares upon any exercise of
the Warrants or any conversion of Shares and does not make available a
sufficient number of authorized but unissued and otherwise unreserved shares of
Common Stock for such issuance within 60 days after the occurrence of such
deficiency and (ii) at least 6,401,394 authorized but unissued and otherwise
unreserved shares of Common Stock, less reductions reasonably agreed to by the
Purchasers to reflect shares of Common Stock issued upon conversion of the
Shares (and, therefore, reduced aggregate dividend payments), as dividends on
the Shares, upon exercise of the Warrants or upon a redemption of the Shares;
(e) at any time after the Required Effectiveness Date, any Common Stock issuable
pursuant to the Transaction Documents is not listed on an Eligible Market; (f)
any other Event (as defined in the Registration Rights Agreement) occurs and
remains uncured for 60 days; (g) the Company fails to make any cash payment
required under the Transaction Documents and such failure is not cured within
five days after notice of such default is first given to the Company by a
Purchaser; (h) the Company defaults in the timely performance of any other
obligation under the Transaction Documents and such default continues uncured
for a period of 20 days after the date on which notice of such default is first
given to the Company by a Purchaser (it being understood that no prior notice
need be given in the case of a default that cannot reasonably be cured within 20
days); or (i) any Change of Control event.


                                       7

      "UNDERLYING SHARES" means the shares of Common Stock issuable upon
conversion of, or in redemption of, the Shares, as payment of dividends on the
Shares and upon exercise of the Warrants, and any securities issued in exchange
for, or upon conversion or in respect of, such shares.

      "UNDERLYING SHARES REGISTRATION STATEMENT" means a registration statement
meeting the requirements set forth in the Registration Rights Agreement and
covering the resale of the Underlying Shares by the Purchasers.

      "WARRANTS" means the Common Stock purchase warrants, in the forms of
Exhibit C-1, Exhibit C-2 and Exhibit C-3.

                                   ARTICLE II
                                PURCHASE AND SALE

      2.1 Sale and Issuance of Preferred Stock at First Closing. Subject to the
terms and conditions of this Agreement, each Purchaser agrees, severally and not
jointly, to purchase at the First Closing and the Company agrees to sell and
issue to each Purchaser at the First Closing, that number of shares of Series
B-1 Preferred Stock set forth opposite such Purchaser's name on Schedule A under
the heading "Initial Shares" and a Warrant in the form of Exhibit C-1 having the
terms set forth in Section 2.8(a) below, for the aggregate purchase price set
forth opposite such Purchaser's name on Schedule A under the heading "First
Closing Purchase Price".

      2.2 Sale and Issuance of Preferred Stock at Second Closing. Subject to the
terms and conditions of this Agreement, including without limitation Section 2.6
hereof, each Purchaser agrees, severally and not jointly, to purchase at the
Second Closing and the Company agrees to sell and issue to each Purchaser at the
Second Closing, that number of shares of Series B-2 Preferred Stock set forth
opposite such Purchaser's name on Schedule A under the heading "Second Closing
Shares" and a Warrant (the "Second Closing Warrant") in the form of Exhibit C-2
having the terms set forth in Section 2.8(b) below, for the aggregate purchase
price set forth opposite such Purchaser's name on Schedule A under the heading
"Second Closing Purchase Price".

      2.3 Exchange, Sale and Issuance of Preferred Stock at Third Closing.

            (a) Subject to the terms and conditions of this Agreement, including
without limitation Section 2.7 hereof, the Company shall at the Third Closing
(i) issue to each Purchaser a number of shares of Series B-I Preferred Stock
equal to the number of such Purchaser's Initial Shares set forth on Schedule A,
and each Purchaser severally agrees to exchange such Initial Shares for such
shares of Series B-I Preferred Stock and (ii) issue to each Purchaser a number
of shares of Series B-II Preferred Stock equal to the number of such Purchaser's
Second Closing Shares set forth in Schedule A, and each Purchaser severally
agrees to exchange such Second Closing Shares for such shares of Series B-II
Preferred Stock.

            (b) Subject to the terms and conditions of this Agreement, including
without limitation Section 2.7 hereof, each Purchaser agrees, severally and not
jointly, to purchase at the Third Closing and the Company agrees to sell and
issue to each Purchaser at the Third Closing, that number of shares of Series
B-I Preferred Stock, if any, set forth opposite such Purchaser's


                                       8

name on Schedule A under the heading "Third Closing Shares" and a Warrant (the
"Third Closing Warrant") in the form of Exhibit C-3 having the terms set forth
in Section 2.8(c) below, for the aggregate purchase price, if any, set forth
opposite such Purchaser's name on Schedule A under the heading "Third Closing
Purchase Price".

      2.4 Closings.

            (a) The purchase and sale of the Initial Shares pursuant to the
terms of Section 2.1 shall take place at the offices of Proskauer Rose LLP in
New York, New York, at 10:00 a.m. on February 6, 2002 (which time and place are
designated as the "First Closing").

            (b) The purchase and sale of Second Closing Shares pursuant to the
terms and conditions of Sections 2.2 and this Section 2.4 shall take place at
the offices of Proskauer Rose LLP in New York, New York at 10:00 a.m. on
February 28, 2002 (which time and place are designated as the "Second Closing").

            (c) The exchange of the Initial Shares and Second Closing Shares and
the purchase and sale of Third Closing Shares pursuant to the terms and
conditions of Section 2.3 and this Section 2.4 shall take place at the offices
of Proskauer Rose LLP in New York, New York on the date hereof,
contemporaneously with the execution and delivery of this Agreement (which time
and place are designated as the "Third Closing").

      2.5 First Closing Deliveries.

            (a) At the First Closing, the Company shall deliver or cause to be
delivered to each Purchaser the following:

                  (i) one or more stock certificates evidencing that number of
      Initial Shares indicated on Schedule A under the heading "Initial Shares",
      registered in the name of such Purchaser;

                  (ii) a Warrant in the form of Exhibit C-1, registered in the
      name of such Purchaser, pursuant to which such Purchaser shall have the
      right to acquire that number of shares of Common Stock as set forth in
      Section 2.8(a) below;

                  (iii) evidence that the Initial Series B Certificate of
      Designations has been filed and become effective on or prior to the
      Closing Date of the First Closing with the Secretary of State of the State
      of Delaware, in form and substance mutually agreed to by the parties;

                  (iv) the legal opinion of Company Counsel, in the form of
      Exhibit D, executed by such counsel and delivered to the Purchasers;

                  (v) the Registration Rights Agreement duly executed by the
      Company; and

                  (vi) any other documents reasonably requested by the
      Purchasers or Purchaser Counsel in connection with the First Closing.


                                       9

            (b) At the First Closing, each Purchaser shall deliver or cause to
be delivered to the Company the following:

                  (i) the purchase price set forth opposite such Purchaser's
      name on Schedule A under the heading "First Closing Purchase Price", in
      United States dollars and in immediately available funds, by wire transfer
      to an account designated in writing by the Company for such purpose; and

                  (ii) the Registration Rights Agreement duly executed by such
      Purchaser.

      2.6 Second Closing Deliveries.

            (a) At the Second Closing, the Company shall deliver or cause to be
delivered to each applicable Purchaser the following:

                  (i) one or more stock certificates evidencing that number of
      Second Closing Shares as set forth opposite such Purchaser's name on
      Schedule A under the heading "Second Closing Shares", registered in the
      name of such Purchaser;

                  (ii) a Warrant in the form of Exhibit C-2, registered in the
      name of such Purchaser, pursuant to which such Purchaser shall have the
      right to acquire that number of shares of Common Stock as set forth in
      Section 2.8(b);

                  (iii) the legal opinion of Company Counsel, in the form of
      Exhibit E, executed by such counsel and delivered to the Purchasers;

                  (iv) a certificate from the president of the Company
      certifying that all the representations and warranties of the Company
      contained in Section 3.1 herein are true and correct as of the Second
      Closing; and

                  (v) any other documents reasonably requested by the Purchasers
      or Purchaser Counsel in connection with the Second Closing.

            (b) At the Second Closing, each applicable Purchaser shall deliver
or cause to be delivered to the Company the following:

                  (i) the purchase price, if any, set forth opposite such
      Purchaser's name on Schedule A under the heading "Second Closing Purchase
      Price", in United States dollars and in immediately available funds, by
      wire transfer to an account designated in writing by the Company for such
      purpose; and

                  (ii) a certificate from such Purchaser, if an individual, or
      an authorized executive officer of such Purchaser, if an entity,
      certifying that all the representations and warranties of such Purchaser
      contained in Section 2.8 herein are true and correct as of the Second
      Closing.

      2.7 Third Closing Deliveries.


                                       10

            (a) At the Third Closing, the Company shall deliver or cause to be
delivered to each applicable Purchaser the following:

                  (i) one or more stock certificates evidencing, in the
      aggregate, the number of shares of Series B-I Preferred Stock equal to the
      number of such Purchaser's Initial Shares exchanged pursuant to Section
      2.3;

                  (ii) one or more stock certificates evidencing, in the
      aggregate, the number of shares of Series B-II Preferred Stock equal to
      the number of such Purchaser's Second Closing Shares exchanged pursuant to
      Section 2.3;

                  (iii) one or more stock certificates evidencing that number of
      Third Closing Shares as set forth opposite such Purchaser's name on
      Schedule A under the heading "Third Closing Shares", registered in the
      name of such Purchaser;

                  (iv) a Warrant in the form of Exhibit C-3, registered in the
      name of such Purchaser, pursuant to which such Purchaser shall have the
      right to acquire that number of shares of Common Stock as set forth in
      Section 2.8(c);

                  (v) evidence that the Series B Certificate of Designations and
      the Series C Certificate of Designations each have been filed and become
      effective as of the Closing Date of the Third Closing with the Secretary
      of State of the State of Delaware, in form and substance mutually agreed
      to by the parties;

                  (vi) the legal opinion of Company Counsel, in the form of
      Exhibit F, executed by such counsel and delivered to the Purchasers;

                  (vii) the Registration Rights Agreement duly executed by the
      Company;

                  (viii) the amendments of the Warrants issued on February 6,
      2002 and February 28, 2002, each such amendment to be in the form of
      Exhibit G and to be executed by the Company;

                  (ix) a certificate from the chief financial officer of the
      Company certifying that all the representations and warranties of the
      Company contained in Section 3.1 herein are true and correct as of the
      Third Closing; and

                  (x) any other documents reasonably requested by the Purchasers
      or Purchaser Counsel in connection with the Third Closing.

            (b) At the Third Closing, each applicable Purchaser shall deliver or
cause to be delivered to the Company the following:

                  (i) stock certificates representing the number of Initial
      Shares and Second Closing Shares held by such Purchaser;

                  (ii) the purchase price set forth opposite such Purchaser's
      name on Schedule A under the heading "Third Closing Purchase Price", in
      United States dollars


                                       11

      and in immediately available funds, by wire transfer to an account
      designated in writing by the Company for such purpose;

                  (iii) the Registration Rights Agreement duly executed by such
      Purchaser;

                  (iv) the amendments of the Warrants issued on February 6, 2002
      and February 28, 2002;

                  (v) the unanimous consent of the Purchasers, as holders of the
      outstanding shares of Preferred Stock, authorizing the filing of the
      Series B Certificate of Designations and Series C Certification of
      Designations to the extent required by Section 11 of the Initial Series B
      Certificate of Designations; and

                  (vi) a certificate from such Purchaser, if an individual, or
      an authorized executive officer of such Purchaser, if an entity,
      certifying that all the representations and warranties of such Purchaser
      contained in Section 3.2 herein are true and correct as of the Third
      Closing.

      2.8 Warrants.

            (a) At the First Closing, each Purchaser shall be issued a Warrant
in the form of Exhibit C-1 that shall be exercisable for a number of shares of
Common Stock equal to the product of 365,864 times the quotient of (i) the
aggregate First Closing Purchase Price paid by such Purchaser, divided by (ii)
$30,000,000, rounded up to the nearest share. Such Warrant shall have an
exercise price per share equal to $23.99.

            (b) At the Second Closing, each Purchaser shall be issued a Warrant
in the form of Exhibit C-2 that shall be exercisable for a number of shares
equal to the product of 283,460 times the quotient of (i) the aggregate Second
Closing Purchase Price paid by such Purchaser, divided by (ii) $20,000,000,
rounded up to the nearest share. Such Warrant shall have an exercise price per
share equal to $20.64.

            (c) At the Third Closing, each applicable Purchaser shall be issued
a Warrant in the form of Exhibit C-3 that shall be exercisable for a number of
shares equal to the product of 141,730 times the quotient of (i) the aggregate
Third Closing Purchase Price paid by such Purchaser, divided by (ii)
$10,000,000, rounded up to the nearest share. Such Warrant shall have an
exercise price per share equal to $23.99.

                                   ARTICLE III
                         REPRESENTATIONS AND WARRANTIES

      3.1 Representations and Warranties of the Company. The Company hereby
makes the following representations and warranties to each of the Purchasers:

            (a) Subsidiaries. The Company does not directly or indirectly
control or own any interest in any other corporation, partnership, joint venture
or other business association or entity, other than those listed in Schedule
3.1(a). Except as disclosed in Schedule 3.1(a), the


                                       12

Company owns, directly or indirectly, all of the capital stock of each
Subsidiary free and clear of any lien, charge, claim, security interest,
encumbrance, right of first refusal or other restriction (collectively,
"Liens"), and all the issued and outstanding shares of capital stock of each
Subsidiary are validly issued and are fully paid, non-assessable and free of
preemptive and similar rights.

            (b) Organization and Qualification. Each of the Company and the
Material Subsidiaries is an entity duly incorporated or otherwise organized,
validly existing and in good standing under the laws of the jurisdiction of its
incorporation or organization (as applicable), with the requisite power and
authority to own and use its properties and assets and to carry on its business
as currently conducted. Neither the Company nor any Material Subsidiary is in
violation of any of the provisions of its respective certificate or articles of
incorporation, bylaws or other organizational or charter documents. Each of the
Company and the Material Subsidiaries is duly qualified to do business and is in
good standing as a foreign corporation or other entity in each jurisdiction in
which the nature of the business conducted or property owned by it makes such
qualification necessary, except where the failure to be so qualified or in good
standing, as the case may be, could not, individually or in the aggregate, (i)
adversely affect the legality, validity or enforceability of any Transaction
Document, (ii) have or result in a material adverse effect on the results of
operations, assets, prospects, business or condition (financial or otherwise) of
the Company and the Subsidiaries, taken as a whole, or (iii) adversely impair
the Company's ability to perform fully on a timely basis its obligations under
any of the Transaction Documents (any of (i), (ii) or (iii), a "Material Adverse
Effect").

            (c) Authorization; Enforcement. The Company has the requisite
corporate power and authority to enter into and to consummate the transactions
contemplated by each of the Transaction Documents and otherwise to carry out its
obligations hereunder and thereunder. The execution and delivery of each of the
Transaction Documents by the Company and the consummation by it of the
transactions contemplated hereby and thereby have been duly authorized by all
necessary action on the part of the Company and no further consent or action is
required by the Company, its Board of Directors or its stockholders (except to
the extent that stockholder approval may be required pursuant to the rules of
the Nasdaq National Market for the issuance of Underlying Shares equal to or
greater than 20% of the number of shares of Common Stock outstanding immediately
prior to the First Closing Date (the "Nasdaq Stockholder Approval Rule")). Each
of the Transaction Documents has been (or upon delivery will be) duly executed
by the Company and is, or when delivered in accordance with the terms hereof,
will constitute the valid and binding obligation of the Company enforceable
against the Company in accordance with its terms.

            (d) No Conflicts. The execution, delivery and performance of the
Transaction Documents by the Company and the consummation by the Company of the
transactions contemplated hereby and thereby, including the filing of the
Initial Series B Certificate of Designations pursuant to Section 2.5 and the
Series B Certificate of Designations and Series C Certificate of Designations
pursuant to Section 2.7 and the issuance of the Shares, do not and will not (i)
conflict with or violate any provision of the Company's certificate of
incorporation or bylaws, or (ii) subject to obtaining the Required Approvals (as
defined below), conflict with, or constitute a default (or an event that with
notice or lapse of time or both would become a default) under, or give to others
any rights of termination, amendment, acceleration or cancellation (with


                                       13

or without notice, lapse of time or both) of, any agreement, credit facility,
debt or other instrument (evidencing a Company or Subsidiary debt or otherwise)
or other understanding to which the Company or any Subsidiary is a party or by
which any property or asset of the Company or any Subsidiary is bound or
affected, or (iii) result in a violation of any law, rule, regulation, order,
judgment, injunction, decree or other restriction of any court or governmental
authority to which the Company or a Subsidiary is subject (including federal and
state securities laws and regulations) and the rules and regulations of any
self-regulatory organization to which the Company or its securities are subject,
or by which any property or asset of the Company or a Subsidiary is bound or
affected; except in the case of each of clauses (ii) and (iii), such as could
not reasonably be expected to have or result in, individually or in the
aggregate, a Material Adverse Effect.

            (e) Filings, Consents and Approvals. Neither the Company nor any
Subsidiary is required to obtain any consent, waiver, authorization or order of,
give any notice to, or make any filing or registration with, any court or other
federal, state, local or other governmental authority or other Person in
connection with the execution, delivery and performance by the Company of the
Transaction Documents, other than (i) the filings required under Section 4.8 and
the required filing of the Initial Series B Certificate of Designations pursuant
to Section 2.5 and the Series B Certificate of Designations and the Series C
Certificate of Designations pursuant to Section 2.7, (ii) the filing with the
Commission of the Underlying Shares Registration Statement, (iii) the
application(s) to each Trading Market for the listing of the Underlying Shares
for trading thereon in the time and manner required thereby, (iv) applicable
Blue Sky filings, (v) approval of the stockholders pursuant to the Nasdaq
Stockholder Approval Rule, and (vi) in all other cases where the failure to
obtain such consent, waiver, authorization or order, or to give such notice or
make such filing or registration could not reasonably be expected to have or
result in, individually or in the aggregate, a Material Adverse Effect
(collectively, the "Required Approvals").

            (f) Issuance of the Securities. The Shares, the Underlying Shares
and the shares of Series C Preferred Stock have been duly authorized and, when
issued in accordance with the Transaction Documents, will be duly and validly
issued, fully paid and nonassessable, free and clear of all Liens and shall not
be subject to preemptive rights or similar rights of stockholders. The Warrants
have been duly authorized and the issuance thereof is not subject to preemptive
rights or similar rights of stockholders. The Company has reserved from its duly
authorized capital stock a number of shares of Common Stock for issuance of the
Securities (including the Underlying Shares) at least equal to the Required
Minimum on the date hereof.

            (g) Capitalization. The number of shares and type of all authorized,
issued and outstanding capital stock, options and other securities of the
Company (whether or not presently convertible into or exercisable or
exchangeable for shares of capital stock of the Company) are set forth in
Schedule 3.1(g). All outstanding shares of capital stock are duly authorized,
validly issued, fully paid and nonassessable and have been issued in compliance
with all applicable securities laws. Except as disclosed in Schedule 3.1(g),
there are no outstanding options, warrants, script rights to subscribe to, calls
or commitments of any character whatsoever relating to, or securities, rights or
obligations convertible into or exchangeable for, or giving any Person any right
to subscribe for or acquire, any shares of Common Stock, or contracts,
commitments, understandings or arrangements by which the Company or any
Subsidiary is or


                                       14

may become bound to issue additional shares of Common Stock, or securities or
rights convertible into or exercisable or exchangeable for shares of Common
Stock. Except as disclosed in Schedule 3.1(g), there are no anti-dilution or
price adjustment provisions contained in any security issued by the Company (or
in any agreement providing rights to security holders) and the issue and sale of
the Securities (including the Underlying Shares) and Series C Preferred Stock
will not obligate the Company to issue shares of Common Stock or other
securities to any Person (other than the Purchasers) and will not result in a
right of any holder of Company securities to adjust the exercise, conversion,
exchange or reset price under such securities. To the knowledge of the Company,
except as specifically disclosed in Schedule 3.1(g), no Person or group of
related Persons beneficially owns (as determined pursuant to Rule 13d-3 under
the Exchange Act), or has the right to acquire, by agreement with or by
obligation binding upon the Company, beneficial ownership of in excess of 5% of
the outstanding Common Stock, ignoring for such purposes any limitation on the
number of shares of Common Stock that may be owned at any single time.

            (h) SEC Reports; Financial Statements. The Company has filed all
reports required to be filed by it under the Exchange Act, including pursuant to
Section 13(a) or 15(d) thereof, for the two years preceding the date hereof (or
such shorter period as the Company was required by law to file such material)
(the foregoing materials being collectively referred to herein as the "SEC
Reports" and, together with this Agreement and the Schedules to this Agreement,
the "Disclosure Materials"). The Company has delivered to the Purchasers a copy
of all SEC Reports filed within the 10 days preceding the date hereof. As of
their respective dates, the SEC Reports complied in all material respects with
the requirements of the Exchange Act and the rules and regulations of the
Commission promulgated thereunder, and none of the SEC Reports, when filed,
contained any untrue statement of a material fact or omitted to state a material
fact required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading. The financial statements of the Company included in the SEC Reports
complied in all material respects with applicable accounting requirements and
the rules and regulations of the Commission with respect thereto as in effect at
the time of filing. Such financial statements were prepared in accordance with
United States generally accepted accounting principles applied on a consistent
basis during the periods involved ("GAAP"), except as may be otherwise specified
in such financial statements or the notes thereto, and fairly present in all
material respects the financial position of the Company and its consolidated
subsidiaries as of and for the dates thereof and the results of operations and
cash flows for the periods then ended, subject, in the case of unaudited
statements, to normal year-end audit adjustments and the absence of footnotes.
All material agreements to which the Company or any Subsidiary is a party or to
which the property or assets of the Company or any Subsidiary are subject have
been included as part of or specifically identified in the SEC Reports to the
extent required by the rules and regulations of the Commission.

            (i) Material Changes. Since the date of the latest audited financial
statements included within the SEC Reports, except as specifically disclosed in
the SEC Reports, (i) there has been no event, occurrence or development that has
had or that could reasonably be expected to result in a Material Adverse Effect,
(ii) the Company has not incurred any material liabilities (contingent or
otherwise) other than (A) trade payables and accrued expenses incurred in the
ordinary course of business, (B) liabilities not required to be reflected in the
Company's financial


                                       15

statements pursuant to GAAP and (C) as set forth in the press release issued by
the Company on January 23, 2002, (iii) the Company has not altered its method of
accounting or the identity of its auditors, (iv) the Company has not declared or
made any dividend or distribution of cash or other property to its stockholders
or purchased, redeemed or made any agreements to purchase or redeem any shares
of its capital stock (other than in connection with restricted stock grants to
employees), and (v) the Company has not issued any equity securities to any
officer, director or Affiliate, except pursuant to existing Company stock option
plans.

            (j) Litigation. There is no action, suit, inquiry, notice of
violation, proceeding or investigation pending or, to the knowledge of the
Company, threatened against or affecting the Company, any Subsidiary or any of
their respective properties before or by any court, arbitrator, governmental or
administrative agency or regulatory authority (federal, state, county, local or
foreign) (collectively, an "Action") which (i) adversely affects or challenges
the legality, validity or enforceability of any of the Transaction Documents,
Series C Preferred Stock or the Securities or (ii) could, if there were an
unfavorable decision, individually or in the aggregate, reasonably be expected
to have or result in a Material Adverse Effect. Neither the Company nor any
Subsidiary, nor any director or officer thereof, is or has been the subject of
any Action involving a claim of violation of or liability under federal or state
securities laws with respect to the Company or a Subsidiary or a claim of breach
of fiduciary duty with respect to the Company or a Subsidiary. The Company does
not have pending before the Commission any request for confidential treatment of
information, and the Company does not expect to make any such request prior to
the Required Effectiveness Date. There has not been, and to the knowledge of the
Company, there is not pending or contemplated, any investigation by the
Commission involving the Company or any current or former director or officer of
the Company with respect to the Company or a Subsidiary. The SEC has not issued
any stop order or other order suspending the effectiveness of any registration
statement filed by the Company or any Subsidiary under the Exchange Act or the
Securities Act. No strike, work stoppage, slow down or other material labor
problem exists or, to the knowledge of the Company, is threatened or imminent
with respect to any of the employees of the Company or the Subsidiaries.

            (k) Compliance. Neither the Company nor any Subsidiary (i) is in
default under or in violation of (and no event has occurred that has not been
waived that, with notice or lapse of time or both, would result in a default by
the Company or any Subsidiary under), nor has the Company or any Subsidiary
received notice of a claim that it is in default under or that it is in
violation of, any indenture, loan or credit agreement or any other agreement or
instrument to which it is a party or by which it or any of its properties is
bound (whether or not such default or violation has been waived), (ii) is in
violation of any order of any court, arbitrator or governmental body, or (iii)
is or has been in violation of any statute, rule or regulation of any
governmental authority, including without limitation all foreign, federal, state
and local laws relating to taxes, environmental protection, occupational health
and safety, product quality and safety and employment and labor matters, except
in each case as, individually or in the aggregate, are not reasonably likely to
have or result in a Material Adverse Effect.

            (l) Regulatory Permits. The Company and the Subsidiaries possess all
certificates, authorizations and permits issued by the appropriate federal,
state, local or foreign regulatory authorities necessary to conduct their
respective businesses as described in the SEC Reports, except where the failure
to possess such permits, individually or in the aggregate, are


                                       16

not reasonably likely to have or result in a Material Adverse Effect ("Material
Permits"), and neither the Company nor any Subsidiary has received any notice of
proceedings relating to the revocation or modification of any Material Permit.

            (m) Transactions With Affiliates and Employees. Except as set forth
in SEC Reports filed at least ten days prior to the date hereof, none of the
officers or directors of the Company is presently a party to any transaction
with the Company or any Subsidiary (other than for services as employees,
officers and directors), including any contract, agreement or other arrangement
providing for the furnishing of services to or by, providing for rental of real
or personal property to or from, or otherwise requiring payments to or from any
officer or director or, to the knowledge of the Company, any entity in which any
officer or director has a material interest.

            (n) Internal Accounting Controls. The Company and the Subsidiaries
maintain a system of internal accounting controls sufficient to provide
reasonable assurance that (i) transactions are executed in accordance with
management's general or specific authorizations, (ii) transactions are recorded
as necessary to permit preparation of financial statements in conformity with
generally accepted accounting principles and to maintain asset accountability,
(iii) access to assets is permitted only in accordance with management's general
or specific authorization, and (iv) the recorded accountability for assets is
compared with the existing assets at reasonable intervals and appropriate action
is taken with respect to any differences.

            (o) Certain Fees. Except for the fees described in Schedule 3.1(o),
all of which are payable to registered broker-dealers, no brokerage or finder's
fees or commissions are or will be payable by the Company to any broker,
financial advisor or consultant, finder, placement agent, investment banker,
bank or other Person with respect to the transactions contemplated by this
Agreement, and the Company has not taken any action that would cause any
Purchaser to be liable for any such fees or commissions.

            (p) Private Placement. Neither the Company nor any Person acting on
the Company's behalf has sold or offered to sell or solicited any offer to buy
the Securities by means of any form of general solicitation or advertising.
Neither the Company nor any of its Affiliates nor any person acting on the
Company's behalf has, directly or indirectly, at any time within the past six
months, made any offer or sale of any security or solicitation of any offer to
buy any security under circumstances that would (i) eliminate the availability
of an exemption from registration under the Securities Act in connection with
the offer and sale of the Securities as contemplated hereby or (ii) cause the
offering of the Securities pursuant to the Transaction Documents to be
integrated with prior offerings by the Company for purposes of any applicable
law, regulation or shareholder approval provisions, including without limitation
under the rules and regulations of any Trading Market. The Company is not, and
is not an Affiliate of, an "investment company" within the meaning of the
Investment Company Act of 1940, as amended. The Company is not a United States
real property holding corporation within the meaning of the Foreign Investment
in Real Property Tax Act of 1980. Neither the Company, nor any of its
affiliates, nor any Person acting on its or their behalf, has paid or given,
either directly or indirectly, any commission or other remuneration to any
person for soliciting the exchange of the Series B-1 Preferred Stock for the
Series B-I Preferred Stock or the exchange of the Series B-


                                       17

2 Preferred Stock for the Series B-II Preferred Stock or for any other
transaction contemplated by this Agreement.

            (q) Form S-3 Eligibility. The Company has the ability to register
its Common Stock for resale by the Purchasers under Form S-3 promulgated under
the Securities Act.

            (r) Listing and Maintenance Requirements. The Company has not, in
the two years preceding the date hereof, received notice (written or oral) from
any Trading Market on which the Common Stock is or has been listed or quoted to
the effect that the Company is not in compliance with the listing or maintenance
requirements of such Trading Market. The Company is, and has no reason to
believe that it will not in the foreseeable future continue to be, in compliance
with all such listing and maintenance requirements.

            (s) Registration Rights. Except as described in Schedule 3.1(s), the
Company has not granted or agreed to grant to any Person any rights (including
"piggy-back" registration rights) to have any securities of the Company
registered with the Commission or any other governmental authority that have not
been satisfied.

            (t) Application of Takeover Protections. The Company and its Board
of Directors have taken all necessary action, if any, in order to render
inapplicable any control share acquisition, business combination, poison pill
(including any distribution under a rights agreement) or other similar
anti-takeover provision under the Company's certificate of incorporation or the
laws of its state of incorporation that is or could become applicable to the
Purchasers as a result of the Purchasers and the Company fulfilling their
obligations or exercising their rights under the Transaction Documents,
including without limitation the Company's issuance of the Securities or Series
C Preferred Stock and the Purchasers' ownership of the Securities or Series C
Preferred Stock.

            (u) Disclosure. The Company confirms that neither it nor any other
Person acting on its behalf has provided any of the Purchasers or their agents
or counsel with any information that constitutes or could reasonably be expected
to constitute material, nonpublic information. The Company understands and
confirms that each of the Purchasers will rely on the foregoing representations
in effecting transactions in securities of the Company. The Company acknowledges
and agrees that no Purchaser makes or has made any representations or warranties
with respect to the transactions contemplated hereby other than those
specifically set forth in Section 3.2.

            (v) Acknowledgment Regarding Purchasers' Purchase of Securities. The
Company acknowledges and agrees that each of the Purchasers is acting solely in
the capacity of an arm's length purchaser with respect to this Agreement and the
transactions contemplated hereby. The Company further acknowledges that no
Purchaser is acting as a financial advisor or fiduciary of the Company (or in
any similar capacity) with respect to this Agreement and the transactions
contemplated hereby and any advice given by any Purchaser or any of their
respective representatives or agents in connection with this Agreement and the
transactions contemplated hereby is merely incidental to the Purchasers'
purchase of the Securities. The Company further represents to each Purchaser
that the Company's decision to enter into this


                                       18

Agreement has been based solely on the independent evaluation of the Company and
its representatives.

      3.2 Representations and Warranties of the Purchasers. Each Purchaser
hereby, as to itself only and for no other Purchaser, represents and warrants to
the Company as follows:

            (a) Organization; Authority. Such Purchaser is an entity duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its organization with the requisite corporate or partnership
power and authority to enter into and to consummate the transactions
contemplated by the Transaction Documents and otherwise to carry out its
obligations thereunder. The purchase by such Purchaser of the Securities
hereunder has been duly authorized by all necessary action on the part of such
Purchaser. Each of this Agreement and the Registration Rights Agreement has been
duly executed by such Purchaser, and when delivered by such Purchaser in
accordance with the terms hereof, will constitute the valid and legally binding
obligation of such Purchaser, enforceable against it in accordance with its
terms.

            (b) Investment Intent. Such Purchaser is acquiring the Securities as
principal for its own account for investment purposes only and not with a view
to or for distributing or reselling such Securities or any part thereof, without
prejudice, however, to such Purchaser's right, subject to the provisions of this
Agreement and the Registration Rights Agreement, at all times to sell or
otherwise dispose of all or any part of such Securities pursuant to an effective
registration statement under the Securities Act or under an exemption from such
registration and in compliance with applicable federal and state securities
laws. Nothing contained herein shall be deemed a representation or warranty by
such Purchaser to hold Securities for any period of time. Such Purchaser is
acquiring the Securities hereunder in the ordinary course of its business. Such
Purchaser does not have any agreement or understanding, directly or indirectly,
with any Person to distribute any of the Securities.

            (c) Purchaser Status. From the time such Purchaser was initially
offered the Securities through the Third Closing Date, the Purchaser has been or
will be, as the case may be, an "accredited investor" as defined in Rule 501(a)
under the Securities Act.

            (d) Experience of such Purchaser. Such Purchaser, either alone or
together with its representatives, has such knowledge, sophistication and
experience in business and financial matters so as to be capable of evaluating
the merits and risks of the prospective investment in the Securities, and has so
evaluated the merits and risks of such investment. Such Purchaser is able to
bear the economic risk of an investment in the Securities and, at the present
time, is able to afford a complete loss of such investment.

            (e) Access to Information. Such Purchaser acknowledges that it has
reviewed the Disclosure Materials and has been afforded: (i) the opportunity to
ask such questions as it has deemed necessary of, and to receive answers from,
representatives of the Company concerning the terms and conditions of the
offering of the Securities and the merits and risks of investing in the
Securities; (ii) access to information about the Company and the Subsidiaries
and their respective financial condition sufficient to enable it to evaluate its
investment; and (iii) the opportunity to obtain such additional information that
the Company possesses or can acquire without unreasonable effort or expense that
is necessary to make an informed investment


                                       19

decision with respect to the investment. Neither such inquiries nor any other
investigation conducted by or on behalf of such Purchaser or its representatives
or counsel, nor any other provisions of this Section 3.2, shall modify, amend or
affect such Purchaser's right to rely on the truth, accuracy and completeness of
the Disclosure Materials and the Company's representations and warranties
contained in the Transaction Documents. Such Purchaser does not have actual
knowledge that any representation or warranty of the Company in the Transaction
Documents is not accurate as of the date hereof.

            (f) General Solicitation. Such Purchaser is not purchasing the
Securities as a result of any advertisement, article, notice or other
communication regarding the Securities published in any newspaper, magazine or
similar media or broadcast over television or radio or presented at any seminar
or any other general solicitation or general advertisement.

            (g) Reliance. Such Purchaser understands and acknowledges that (i)
the Securities are being offered and sold to it without registration under the
Securities Act in a private placement that is exempt from the registration
provisions of the Securities Act and (ii) the availability of such exemption
depends in part on, and the Company will rely upon the accuracy and truthfulness
of, the foregoing representations and such Purchaser hereby consents to such
reliance.

                                   ARTICLE IV
                         OTHER AGREEMENTS OF THE PARTIES

      4.1 Transfer Restrictions.

            (a) Securities may only be disposed of pursuant to an effective
registration statement under the Securities Act or pursuant to an available
exemption from the registration requirements of the Securities Act, and in
compliance with any applicable state securities laws. In connection with any
transfer of Securities other than pursuant to an effective registration
statement or to the Company or pursuant to Rule 144(k), except as otherwise set
forth herein, the Company may require the transferor to provide to the Company
an opinion of counsel selected by the transferor, the form and substance of
which opinion shall be reasonably satisfactory to the Company, to the effect
that such transfer does not require registration under the Securities Act. The
Shares, the Warrants and the rights and obligations of each Purchaser under this
Agreement may be assigned by such Purchaser only pursuant to a Qualified
Transfer. Notwithstanding the foregoing, the Company hereby consents to and
agrees to register on the books of the Company and with its transfer agent,
without any such legal opinion, any transfer of Securities by a Purchaser to an
Affiliate of such Purchaser, provided that the transferee certifies to the
Company that it is an "accredited investor" as defined in Rule 501(a) under the
Securities Act and is purchasing such Shares for investment only and not with a
view to distributing or reselling such Securities and agrees in writing to be
bound by the provisions of this Agreement.

            (b) The Purchasers agree to the imprinting, so long as is required
by this Section 4.1(b), of the following legend on any certificate evidencing
Securities:

            THESE SECURITIES HAVE NOT BEEN REGISTERED WITH THE SECURITIES AND
            EXCHANGE COMMISSION OR THE SECURITIES


                                       20

            COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
            REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
            "SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD
            EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE
            SECURITIES ACT OR PURSUANT TO AN AVAILABLE EXEMPTION FROM THE
            REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN COMPLIANCE
            WITH APPLICABLE STATE SECURITIES OR BLUE SKY LAWS. THESE SECURITIES
            AND THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES MAY BE
            PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN
            SECURED BY SUCH SECURITIES.

            Certificates evidencing Securities shall not be required to contain
            such legend or any other legend (i) pursuant to or following any
            sale of such Securities pursuant to an effective Registration
            Statement covering the resale of such Securities under the
            Securities Act, (ii) following any sale of such Securities pursuant
            to Rule 144, (iii) if such Securities are eligible for sale under
            Rule 144(k), or (iv) if such legend is not, in the reasonable
            opinion of the Company Counsel, required under the circumstances
            under applicable requirements of the Securities Act (including
            judicial interpretations and pronouncements issued by the Staff of
            the Commission). Following the Effective Date or at such earlier
            time as a legend is no longer required for certain Securities, the
            Company will, no later than three Trading Days following the
            delivery by a Purchaser to the Company or the Company's transfer
            agent of a legended certificate representing such Securities,
            deliver or cause to be delivered to such Purchaser a certificate
            representing such Securities that is free from all restrictive and
            other legends. In addition, each certificate for the Shares shall
            bear the following Legend: "THE NUMBER OF PREFERRED SHARES
            REPRESENTED BY THIS CERTIFICATE MAY BE LESS THAN THE NUMBER OF
            PREFERRED SHARES STATED ON THE FACE HEREOF PURSUANT TO SECTION 8(c)
            OF THE CERTIFICATE OF DESIGNATIONS RELATING TO THE PREFERRED SHARES
            REPRESENTED BY THIS CERTIFICATE." The Company may not make any
            notation on its records or give instructions to any transfer agent
            of the Company that enlarge the restrictions on transfer set forth
            in this Section, except as may be required by applicable law.

            (c) The Company acknowledges and agrees that a Purchaser may from
time to time pledge pursuant to a bona fide margin agreement or grant a security
interest in some or all of the Securities and, if required under the terms of
such arrangement, such Purchaser may transfer pledged or secured Securities to
the pledgees or secured parties. Such a pledge or transfer would not be subject
to approval of the Company and no legal opinion of the pledgee, secured party or
pledgor shall be required in connection therewith except as required by
applicable law. Further, no notice shall be required of such pledge. At the
appropriate Purchaser's expense, the Company will execute and deliver such
reasonable documentation as a pledgee or secured party of Securities may
reasonably request in connection with a pledge or transfer of the Securities,
including the preparation and filing of any required prospectus


                                       21

supplement under Rule 424(b)(3) of the Securities Act or other applicable
provision of the Securities Act to appropriately amend the list of Selling
Stockholders thereunder.

            (d) In addition to any other rights available to a Purchaser, if the
Company fails to deliver to such Purchaser a certificate representing Common
Stock by the third Trading Day after the date on which delivery of such
certificate is required by any Transaction Document, and if after such third
Trading Day such Purchaser purchases (in an open market transaction or
otherwise) shares of Common Stock to deliver in satisfaction of a sale by such
Purchaser of the shares that the Purchaser anticipated receiving from the
Company (a "Buy-In"), then the Company shall, within three Trading Days after
such Purchaser's request and in such Purchaser's discretion, either (i) pay cash
to such Purchaser in an amount equal to such Purchaser's total purchase price
(including brokerage commissions, if any) for the shares of Common Stock so
purchased (the "Buy-In Price"), at which point the Company's obligation to
deliver such certificate (and to issue such Common Stock) shall terminate and
the Purchaser shall have been deemed to have tendered the Securities to which
the Underlying Securities relate to the Company for cancellation and shall do so
promptly after the occurrence of such event, or (ii) promptly honor its
obligation to deliver to such Purchaser a certificate or certificates
representing such Common Stock and pay cash to such Purchaser in an amount equal
to the excess (if any) of the Buy-In Price over the product of (A) such number
of shares of Common Stock, times (B) the Closing Price on the date of the event
giving rise to the Company's obligation to deliver such certificate.

      4.2 Acknowledgment of Dilution. The Company acknowledges that the issuance
of the Securities (including the Underlying Shares) will result in dilution of
the outstanding shares of Common Stock, which dilution may be substantial under
certain market conditions. The Company further acknowledges that, subject to the
satisfaction by the Purchasers of their obligations under the Transaction
Documents, the Company's obligations under the Transaction Documents, including
without limitation its obligation to issue the Securities (including the
Underlying Shares) pursuant to the Transaction Documents, are unconditional and
absolute and not subject to any right of set off, counterclaim, delay or
reduction, regardless of the effect of any such dilution or any claim that the
Company may have against any Purchaser.

      4.3 Furnishing of Information. As long as any Purchaser owns Securities,
the Company covenants to timely file (or obtain extensions in respect thereof
and file within the applicable grace period) all reports required to be filed by
the Company after the date hereof pursuant to the Exchange Act. As long as any
Purchaser owns Securities, if the Company is not required to file reports
pursuant to such laws, it will prepare and furnish to the Purchasers and make
publicly available in accordance with paragraph (c) of Rule 144 such information
as is required for the Purchasers to sell the Securities under Rule 144. The
Company further covenants that it will take such further action as any holder of
Securities may reasonably request to satisfy the provisions of Rule 144
applicable to the issuer of securities relating to transactions for the sale of
securities pursuant to Rule 144.

      4.4 Integration. The Company shall not, and shall use its best efforts to
ensure that no Affiliate of the Company shall, sell, offer for sale or solicit
offers to buy or otherwise negotiate in respect of any security (as defined in
Section 2 of the Securities Act) that would be integrated with the offer or sale
of the Securities in a manner that would require the registration under the


                                       22

Securities Act of the sale of the Securities to the Purchasers, or that would be
integrated with the offer or sale of the Securities for purposes of the rules
and regulations of any Trading Market.

      4.5 Reservation and Listing of Securities.

            (a) The Company shall reserve for issuance and maintain a reserve of
6,401,394 shares of Common Stock for issuance pursuant to the Transaction
Documents less any shares of Common Stock issued upon conversion of the Shares,
as dividends on the Shares, upon exercise of the Warrants or upon a redemption
of the Shares or, if smaller, a sufficient number of authorized but unissued and
otherwise unreserved shares of Common Stock available to issue Underlying Shares
upon any exercise of the Warrants or any conversion of Shares.

            (b) If, on any date, the number of authorized but unissued (and
otherwise unreserved) shares of Common Stock (the "Remaining Authorized Shares")
is less than 125% of (i) the Actual Minimum on such date, minus (ii) the number
of shares of Common Stock previously issued pursuant to the Transaction
Documents, then the Board of Directors of the Company shall use its best efforts
to amend the Company's certificate of incorporation to increase the number of
authorized but unissued shares of Common Stock to at least the Required Minimum
at such time (minus the number of shares of Common Stock previously issued
pursuant to the Transaction Documents), as soon as possible and in any event not
later than the 60th day after such date; provided that the Company will not be
required at any time to authorize a number of shares of Common Stock greater
than the maximum remaining number of shares of Common Stock that could possibly
be issued after such time pursuant to the Transaction Documents.

            (c) If, at the time any Purchaser requests an exercise or conversion
of any Securities, the Actual Minimum minus the number of shares of Common Stock
previously issued pursuant to the Transaction Documents exceeds the Remaining
Authorized Shares, then the Company shall issue to the Purchaser requesting such
exercise or conversion a number of Underlying Shares not exceeding such
Purchaser's pro-rata portion of the Remaining Authorized Shares (based on such
Purchaser's share of the aggregate purchase price paid hereunder and considering
any Underlying Shares previously issued to such Purchaser), and the remainder of
the Underlying Shares issuable in connection with such exercise or conversion
(if any) shall constitute "Excess Shares" pursuant to Section 4.5(g) below.

            (d) The Company shall (i) in the time and manner required by each
Trading Market, prepare and file with such Trading Market an additional shares
listing application covering a number of shares of Common Stock at least equal
to the greater of (A) the Required Minimum on the applicable Closing Date and
(B) the Required Minimum on the date of such application, (ii) take all steps
necessary to cause such shares of Common Stock to be approved for listing on
each Trading Market as soon as possible thereafter, (iii) provide to the
Purchasers evidence of such listing, and (iv) maintain the listing of such
Common Stock on each such Trading Market or another Eligible Market.

            (e) If, on any date, the number of shares of Common Stock previously
listed on a Trading Market is less than 125% of the Actual Minimum on such date,
then the Company shall take the necessary actions to list on such Trading
Market, as soon as reasonably possible, a


                                       23

number of shares of Common Stock at least equal to the Required Minimum on such
date; provided that the Company will not be required at any time to list a
number of shares of Common Stock greater than the maximum number of shares of
Common Stock that could possibly be issued pursuant to the Transaction
Documents.

            (f) If the Trading Market is the Nasdaq National Market or the
Nasdaq SmallCap Market, then the maximum number of shares of Common Stock that
the Company may issue pursuant to the Transaction Documents at an effective
purchase price less than the Closing Price on the Trading Day immediately
preceding the date of the First Closing shall be 6,401,394 shares (the "Issuable
Maximum"), unless the Company obtains shareholder approval in accordance with
the rules and regulations of such Trading Market. If, at the time any Purchaser
requests an exercise or conversion of any Securities, the Actual Minimum
(excluding any shares issued or issuable at an effective purchase price in
excess of the Closing Price on the Trading Day immediately preceding the date of
the First Closing) exceeds the Issuable Maximum (and if the Company has not have
previously obtained the required shareholder approval), then the Company shall
issue to the Purchaser requesting such exercise or conversion a number of
Underlying Shares of Common Stock not exceeding such Purchaser's pro-rata
portion of the Issuable Maximum (based on such Purchaser's share of the
aggregate purchase price paid hereunder and considering any Underlying Shares
previously issued to such Purchaser), and the remainder of the Underlying Shares
issuable in connection with such exercise or conversion (if any) shall
constitute "Excess Shares" pursuant to Section 4.5(g) below.

            (g) Any Purchaser to which Excess Shares are attributed based on the
number of Remaining Authorized Shares or the Issuable Maximum shall have the
option, by notice to the Company, to require the Company to either: (i) use its
best efforts to obtain the required shareholder approval necessary to permit the
issuance of such Excess Shares as soon as is possible, but in any event not
later than the 60th day after such notice, or (ii) within five Trading Days
after such notice, pay to such Purchaser, as liquidated damages and not as a
penalty, in cash or in Series C Preferred Stock, at the option of the Company,
an amount equal to the number of Excess Shares times the average Closing Price
over the five Trading Days immediately prior to the date of such notice less the
exercise price thereof in the case of any Underlying Shares issuable upon
exercise of the Warrants (the "Damages Amount") and the Company shall have no
further obligation to issue or deliver such Excess Shares and the Purchaser
shall have been deemed to have tendered the Securities to which the Underlying
Securities related to the Company for cancellation and shall do so promptly
after the occurrence of such event. If the exercising or converting Purchaser
elects the first option under the preceding sentence and the Company fails to
obtain the required shareholder approval on or prior to the 60th day after such
notice, then within three Trading Days after such 60th day, the Company shall
pay the Damages Amount to such Purchaser, as liquidated damages and not as
penalty, and the Company shall have no further obligation to issue or deliver
such Excess Shares. In the event that the Company elects to pay the Damages
Amount in shares of Series C Preferred Stock, the number of shares of Series C
Preferred Stock to be issued to the Purchaser in payment of the Damages Amount
shall be determined by dividing the total Damages Amount then payable to such
Purchaser with respect to all of the Excess Shares then allocated to such
Purchaser by $10,000 (the initial Stated Value per share of the Series C
Preferred Stock) and rounding downward to the nearest whole number of shares of
Series C Preferred Stock. In addition, the Company shall pay to the Purchaser in
cash the amount, if any, by which the Damages Amount payable to such Holder


                                       24

exceeds the aggregate Stated Value of the Series C Preferred Stock issued
pursuant to the preceding sentence. If the total Damages Amount then payable to
the Purchaser is less than $10,000, then the Company shall pay such amount to
such Purchaser entirely in cash.

      4.6 Conversion and Exercise Procedures. The form of Election to Purchase
included in the Warrants and the form of Conversion Notice included in the
Series B Certificate of Designations set forth the totality of the procedures
required in order to exercise the Warrants or convert the Shares under the
Transaction Documents on or after the date of this Agreement. No additional
legal opinion or other information or instructions shall be necessary to enable
the Purchasers to exercise their Warrants or convert their Shares except as may
be required by law. The Company shall honor exercises of the Warrants and
conversions of the Shares and shall deliver Underlying Shares in accordance with
the terms, conditions and time periods set forth in the Transaction Documents.

      4.7 Subsequent Placements.

            (a) Until the second anniversary of the Third Closing Date, the
Company will not, directly or indirectly, offer, sell, grant any option to
purchase, or otherwise dispose of (or announce any offer, sale, grant or any
option to purchase or other disposition of) any of its or the Subsidiaries'
equity or equity equivalent securities, including without limitation any debt,
preferred stock or other instrument or security that is, at any time during its
life and under any circumstances, convertible into or exercisable or
exchangeable for Common Stock (any such offer, sale, grant, disposition or
announcement being referred to as a "Subsequent Placement") unless the Company
shall have first complied with this Section 4.7(a).

                  (i) The Company shall deliver to each Purchaser a written
      notice (the "Offer") of any proposed or intended issuance or sale or
      exchange of the securities being offered (the "Offered Securities") in a
      Subsequent Placement, which Offer shall (w) identify and describe the
      Offered Securities, (x) describe the price and other terms upon which they
      are to be issued, sold or exchanged, and the number or amount of the
      Offered Securities to be issued, sold or exchanged, (y) identify the
      persons or entities (if known) to which or with which the Offered
      Securities are to be offered, issued, sold or exchanged and (z) offer to
      issue and sell to or exchange with the Purchasers fifty percent (50%) of
      the Offered Securities (the "Purchaser Allocation"), allocated among the
      Purchasers (A) first, based on each Purchaser's pro rata portion of the
      aggregate purchase price paid by the Purchasers for all of the Securities
      purchased hereunder (the "Basic Amount"), and (B) with respect to each
      Purchaser that elects to purchase its Basic Amount, based upon any
      additional portion of the Offered Securities attributable to the Basic
      Amounts of other Purchasers as such Purchaser shall indicate it will
      purchase or acquire should the other Purchasers subscribe for less than
      their Basic Amounts (the "Undersubscription Amount").

                  (ii) To accept an Offer, in whole or in part, a Purchaser must
      deliver a written notice to the Company prior to the end of the ten (10)
      Trading Day period of the Offer, setting forth the portion of the
      Purchaser's Basic Amount that such Purchaser elects to purchase and, if
      such Purchaser shall elect to purchase all of its Basic Amount, the
      Undersubscription Amount, if any, that such Purchaser elects to purchase
      (in either


                                       25

      case, the "Notice of Acceptance"). If the Basic Amounts subscribed for by
      all Purchasers are less than the total of all of the Basic Amounts, then
      each Purchaser who has set forth an Undersubscription Amount in its Notice
      of Acceptance shall be entitled to purchase, in addition to the Basic
      Amounts subscribed for, the Undersubscription Amount it has subscribed
      for; provided, however, that if the Undersubscription Amounts subscribed
      for exceed the difference between the total of all the Basic Amounts and
      the Basic Amounts subscribed for (the "Available Undersubscription
      Amount"), each Purchaser who has subscribed for any Undersubscription
      Amount shall be entitled to purchase on that portion of the Available
      Undersubscription Amount as the Basic Amount of such Purchaser bears to
      the total Basic Amounts of all Purchasers that have subscribed for
      Undersubscription Amounts, subject to rounding by the Board of Directors
      to the extent its deems reasonably necessary. If the Purchasers in the
      aggregate have not agreed to purchase the full Purchaser Allocation, none
      of the Purchasers shall be entitled to purchase any of the Offered
      Securities, provided the Offered Securities are sold as described in the
      following clause (iii).

                  (iii) The Company shall have ten (10) Trading Days from the
      expiration of the period set forth in Section 4.7(a)(ii) above to issue,
      sell or exchange (A) fifty percent (50%) of the Offered Securities, if the
      Purchasers in the aggregate have agreed to purchase the full Purchaser
      Allocation, or (B) all of the Offered Securities, if the Purchasers in the
      aggregate have not agreed to purchase the full Purchaser Allocation (the
      Offered Securities so available for issuance, sale or exchange to persons
      other than the Purchasers being referred to herein as the "Available
      Securities"), provided that the Available Securities are issued, sold or
      exchanged only to the offerees described in the Offer (if so described
      therein) and only upon terms and conditions (including, without
      limitation, unit prices and interest rates) that are not more favorable to
      the acquiring person or persons or less favorable to the Company than
      those set forth in the Offer.

                  (iv) In the event the Company shall propose to sell less than
      all the Available Securities (any such sale to be in the manner and on the
      terms specified in Section 4.7(a)(iii) above), then each Purchaser shall
      be deemed to reduce the number or amount of the Offered Securities
      specified in its Notice of Acceptance to an amount that shall be not less
      than the number or amount of the Offered Securities that the Purchaser
      elected to purchase pursuant to Section 4.7(a)(ii) above multiplied by a
      fraction, (i) the numerator of which shall be the number or amount of
      Offered Securities the Company actually proposes to issue, sell or
      exchange (including Offered Securities to be issued or sold to Purchasers
      pursuant to Section 4.7(a)(ii) above prior to such reduction) and (ii) the
      denominator of which shall be the original amount of the Offered
      Securities. The Company may not issue, sell or exchange more than the
      reduced number or amount of the Offered Securities unless and until such
      Offered Securities have again been offered to the Purchasers in accordance
      with Section 4.7(a)(i) above.

                  (v) Upon the closing of the issuance, sale or exchange of all
      or less than all of the Available Securities, the Purchasers shall acquire
      from the Company, and the Company shall issue to the Purchasers, the
      number or amount of Offered Securities specified in the Notices of
      Acceptance, as reduced pursuant to Section 4.7(a)(iv) above, upon the
      terms and conditions specified in the Offer. The purchase by the
      Purchasers of


                                       26

      any Offered Securities is subject in all cases to the preparation,
      execution and delivery by the Company and the Purchasers of a purchase
      agreement relating to such Offered Securities reasonably satisfactory in
      form and substance to the Purchasers and their respective counsel.

                  (vi) Any Offered Securities not acquired by the Purchasers or
      other persons in accordance with Section 4.7(a)(iii) above may not be
      issued, sold or exchanged until they are again offered to the Purchasers
      under the procedures specified in this Agreement.

            (b) The restrictions contained in paragraph (a) of this Section
shall not apply to the issuance of Excluded Stock.

      4.8 Securities Laws Disclosure; Publicity. The Company shall, on the First
Closing Date, issue a press release acceptable to the Purchasers disclosing all
material terms of the transactions contemplated hereby. The Company shall,
within one Trading Day after the Third Closing Date, file a Current Report on
Form 8-K with respect to the transactions effected at the Third Closing.
Thereafter, the Company shall timely file any filings and notices required by
the Commission or applicable law with respect to the transactions contemplated
hereby and provide copies thereof to the Purchasers promptly after filing. The
Company shall, at least two Trading Days prior to the filing or dissemination of
any disclosure required by this paragraph, provide a copy thereof to the
Purchasers for their review, except that with respect to the Current Report on
Form 8-K contemplated by the second sentence of this Section 4.8, the Company
shall provide such copy thereof to the Purchasers for their review by no later
than noon, Eastern Standard Time, on the first Trading Day following the Third
Closing Date. The Company and the Purchasers shall consult with each other in
issuing any press releases or otherwise making public statements or filings and
other communications with the Commission or any regulatory agency or Trading
Market with respect to the transactions contemplated hereby, and neither party
shall issue any such press release or otherwise make any such public statement,
filing or other communication without the prior consent of the other (which
consent shall not be unreasonably withheld), except if such disclosure is
required by law, in which case the disclosing party shall promptly provide the
other party with prior notice of such public statement, filing or other
communication. Notwithstanding the foregoing, the Company shall not publicly
disclose the name of any Purchaser, or include the name of any Purchaser in any
filing with the Commission or any regulatory agency or Trading Market, without
the prior written consent of such Purchaser, except to the extent such
disclosure (but not any disclosure as to the controlling Persons thereof) is
required by law or Trading Market regulations, in which case the Company shall
provide the Purchasers with prior notice of such disclosure. Neither the Company
nor any Person acting on its behalf will provide any Purchaser with material,
nonpublic information about the Company unless such Purchaser consents to
receive such information in writing in advance even if otherwise required
pursuant to the terms of any Transaction Document.

      4.9 Repurchase Upon Occurrence of a Bankruptcy Event. Upon the occurrence
of any Bankruptcy Event, the Company shall immediately be obligated, without any
further action by any Purchaser, to repurchase all outstanding shares of Series
B Preferred Stock and all such Underlying Shares at the Event Price as if each
Holder had delivered an Event Notice immediately prior to the occurrence of such
Bankruptcy Event pursuant to Section 10 of the


                                       27

Series B Certificate of Designations. Such repurchase price shall be payable in
cash, provided that if the Bankruptcy Event occurs as a result of an event set
forth in clause (b), (c) or (d) of the definition of "Bankruptcy Event" set
forth herein, then the Company, at its option, may instead pay the repurchase
price in shares of Series C Preferred Stock. In the event that the Company
elects to pay the repurchase price in shares of Series C Preferred Stock, the
number of such shares shall be determined in the manner described in the final
two sentences of Section 4.5(g).

      4.10 Reimbursement.

            (a) The Company shall indemnify and hold harmless each Purchaser and
any of its Affiliates or any officer, director, partner, controlling person,
employee or agent of a Purchaser or any of its Affiliates (a "Related Person")
from and against any and all Losses, as incurred, arising out of or relating to
any breach by the Company of any of the representations, warranties or covenants
made by the Company in this Agreement or any other Transaction Document, or any
allegation by a third party that, if true, would constitute such a breach. The
conduct of any Proceedings for which indemnification is available under this
paragraph shall be governed by Section 5(c) of the Registration Rights
Agreement. The indemnification obligations of the Company under this paragraph
shall be in addition to any liability that the Company may otherwise have and
shall be binding upon and inure to the benefit of any successors, assigns, heirs
and personal representatives of the Purchasers and any such Related Persons. In
no event shall the Company's liability under this Section 4.10(a) to a Purchaser
or its Related Persons exceed the total purchase price paid by the Purchaser
under this Agreement. If the Company breaches its obligations under any
Transaction Document, then, in addition to any other liabilities the Company may
have under any Transaction Document or applicable law, the Company shall pay or
reimburse the Purchasers on demand for all costs of collection and enforcement
(including reasonable attorney's fees and expenses). Without limiting the
generality of the foregoing, the Company specifically agrees to reimburse the
Purchasers on demand for all costs of enforcing the indemnification obligations
in this paragraph.

            (b) Each Purchaser shall severally indemnify and hold harmless the
Company from and against any and all Losses, as incurred, arising out of or
relating to any breach by such Purchaser of any of the representations,
warranties or covenants made by such Purchaser in this Agreement or any other
Transaction Document, or any allegation by a third party that, if true, would
constitute such a breach. The conduct of any Proceedings for which
indemnification is available under this paragraph shall be governed by Section
5(c) of the Registration Rights Agreement. The indemnification obligations of
such Purchaser under this paragraph shall be in addition to any liability that
such Purchaser may otherwise have and shall be binding upon and inure to the
benefit of any successors, assigns, heirs and personal representatives of the
Company. In no event shall a Purchaser's liability under this Section 4.10(b) to
the Company exceed the total purchase price paid by such Purchaser under this
Agreement. If such Purchaser breaches its obligations under any Transaction
Document, then, in addition to any other liabilities such Purchaser may have
under any Transaction Document or applicable law, such Purchaser shall pay or
reimburse the Company on demand for all costs of collection and enforcement
(including reasonable attorney's fees and expenses). Without limiting the
generality of the foregoing, such Purchaser specifically agrees to reimburse the
Company on demand for all costs of enforcing the indemnification obligations in
this paragraph.


                                       28

      4.11 Default Interest. If the Company fails to make any cash payment
required by any Transaction Document in full when due, then the Company shall
pay interest thereon at a rate of 12% per annum (or such lesser maximum rate
that is permitted to be paid under applicable law) from the date such payment
was due until such amount, plus all such interest thereon, is paid in full.

      4.12 Rights of Shareholders. Each time the Company delivers a notice or
other communication to holders of the Common Stock it will contemporaneously
deliver a copy of such notice or communication to the Purchasers. The Company
acknowledges and agrees that, for so long as a Purchaser holds any Shares
(whether or not such Purchaser holds shares of Common Stock), (a) the officers
and directors of the Company will owe the same duties (fiduciary and otherwise)
to such Purchaser with respect to the Shares owned by such Purchaser as are owed
to a holder of Common Stock and (b) such Purchaser will be entitled to all
rights and remedies with respect to such duties with respect to the Shares owned
by such Purchaser as are available to a holder of Common Stock under the
corporate law of the Company's jurisdiction of incorporation.

      4.13 Shareholders Rights Plan. In the event that a shareholders rights
plan is adopted by the Company, no claim will be made or enforced by the Company
or any other Person that any Purchaser is an "Acquiring Person" under any such
plan or in any way could be deemed to trigger the provisions of such plan by
virtue of receiving Securities under the Transaction Documents.

      4.14 Certain Trading Limitations. For so long as a Purchaser or its
Affiliates hold the Shares originally purchased by it under this Agreement such
Purchaser agrees that it will not enter into any Short Sales. For purposes of
this Section 4.14, a "Short Sale" by a Purchaser means to sell, contract to
sell, grant any option to purchase, or make any short sale of Common Stock,
establish a "put equivalent position" (as such term is defined in Rule 16a-1(h)
under the Exchange Act) or engage in any transaction the result of which will
involve any of the foregoing, at a time when such Purchaser has no equivalent
offsetting long position in the Common Stock. For purposes of determining
whether a Purchaser has an equivalent offsetting long position in the Common
Stock, all Common Stock held by such Purchaser, all Underlying Shares that would
be issuable upon conversion or exercise in full of all Securities then held by
such Purchaser (assuming that such Securities were then fully convertible or
exercisable, notwithstanding any provisions to the contrary, and giving effect
to any conversion or exercise price adjustments scheduled to take effect in the
future) and all shares of Common Stock issuable upon exercise of any call option
or "call equivalent position" (as defined in Rule 16a-1(b) under the Exchange
Act) held by such Purchaser (assuming that such call position was then fully
convertible or exercisable, notwithstanding any provisions to the contrary, and
giving effect to any conversion or exercise price adjustments scheduled to take
effect in the future) shall be deemed to be held long by such Purchaser.

      4.15 Limitation on Issuance and Amendment of Series C Preferred Stock.
Notwithstanding anything set forth in the Transaction Documents to the contrary,
in the event the Company issues 60,000 shares of Series C Preferred Stock in
accordance with one or more provisions of the Transaction Documents, such
issuance shall be deemed to satisfy in full all obligations of the Company with
respect to each and all of such provisions and no additional


                                       29

cash, other securities, or other damages, amounts or consideration shall be
payable thereunder. The Company shall not issue any shares of Series C Preferred
Stock except to a holder of Securities in accordance with the provisions of the
Transaction Documents. The affirmative vote of the holders of a majority of the
outstanding shares of Series B Preferred Stock shall be required for any
amendment, modification or repeal of the Series C Certificate of Designations.

      4.16 Certificate of Elimination. As promptly as practicable after the
Third Closing, the Company may file an appropriate certificate to effectively
eliminate all matters set forth in the Initial Series B Certificate of
Designations.

      4.17 Rule 144. The Company shall not, directly or indirectly, dispute or
otherwise interfere with any claim by a holder of Series B-I Preferred Stock or
Series B-II Preferred Stock issued in exchange for Series B-1 Preferred Stock or
Series B-2 Preferred Stock, respectively, that such holder's holding period of
such Series B-I Preferred Stock or Series B-II Preferred Stock for purposes of
Rule 144 promulgated under the Securities Act (or a successor rule thereto)
("Rule 144") relates back (i.e., tacks) to the holding period for the Series B-1
Preferred Stock and the Series B-2 Preferred Stock, respectively.

                                    ARTICLE V
                                   CONDITIONS

      5.1 Conditions Precedent to the Obligations of the Purchasers. The
obligation of each Purchaser to acquire or exchange Securities at the applicable
Closing is subject to the satisfaction or waiver by such Purchaser, at or before
such Closing, of each of the following conditions:

            (a) Representations and Warranties. The representations and
warranties of the Company contained herein shall be true and correct in all
material respects as of the date when made and as of the applicable Closing as
though made on and as of such date except for those representations and
warranties made as of a specific date which shall be true and correct in all
material respects as of such date;

            (b) Performance. The Company and each other Purchaser shall have
performed, satisfied and complied in all material respects with all covenants,
agreements and conditions required by the Transaction Documents to be performed,
satisfied or complied with by it at or prior to the applicable Closing;

            (c) No Injunction. No statute, rule, regulation, executive order,
decree, ruling or injunction shall have been enacted, entered, promulgated or
endorsed by any court or governmental authority of competent jurisdiction that
prohibits the consummation of any of the transactions contemplated by the
Transaction Documents;

            (d) No Suspensions of Trading in Common Stock; Listing. Trading in
the Common Stock shall not have been suspended by the Commission or any Trading
Market (except for any suspensions of trading of not more than one Trading Day
solely to permit dissemination of material information regarding the Company) at
any time since the date of execution of this Agreement, and the Common Stock
shall have been at all times since such date listed for trading on an Eligible
Market; and


                                       30

            (e) Adverse Changes. Since the date of execution of this Agreement,
no event or series of events shall have occurred that reasonably could be
expected to have or result in a Material Adverse Effect.

      5.2 Conditions Precedent to the Obligations of the Company. The obligation
of the Company to sell or exchange Securities at the applicable Closing is
subject to the satisfaction or waiver by the Company, at or before such Closing,
of each of the following conditions:

            (a) Representations and Warranties. The representations and
warranties of the Purchasers contained herein shall be true and correct in all
material respects as of the date when made and as of each Closing Date as though
made on and as of such date;

            (b) Performance. The Purchasers shall have performed, satisfied and
complied in all material respects with all covenants, agreements and conditions
required by the Transaction Documents to be performed, satisfied or complied
with by the Purchasers at or prior to the applicable Closing; and

            (c) No Injunction. No statute, rule, regulation, executive order,
decree, ruling or injunction shall have been enacted, entered, promulgated or
endorsed by any court or governmental authority of competent jurisdiction that
prohibits the consummation of any of the transactions contemplated by the
Transaction Documents.

                                   ARTICLE VI
                                  MISCELLANEOUS

      6.1 Termination. This Agreement may be terminated by the Company or any
Purchaser, by written notice to the other parties, if the First Closing has not
been consummated by the third business day following the date of this Agreement;
provided that no such termination will affect the right of any party to sue for
any breach by the other party (or parties).

      6.2 Fees and Expenses. At the First Closing, the Company shall pay to Pine
Ridge Financial, Inc., the reasonable legal fees and expenses incurred by the
Purchasers in connection with the preparation and negotiation of the Transaction
Documents up to $50,000 in the aggregate. In lieu of the foregoing payments, the
Pine Ridge Financial, Inc. may retain the amount of such payments instead of
delivering such amounts to the Company at the First Closing or require the
Company to pay such amounts directly to Purchaser Counsel. Except as expressly
set forth in the Transaction Documents to the contrary, each party shall pay the
fees and expenses of its advisers, counsel, accountants and other experts, if
any, and all other expenses incurred by such party incident to the negotiation,
preparation, execution, delivery and performance of this Agreement. The Company
shall pay all transfer agent fees, stamp taxes and other taxes and duties levied
in connection with the issuance of any Securities and any and all costs and
expenses relating to compliance with the Company's obligations under Section
4.5.

      6.3 Entire Agreement. The Transaction Documents, together with the
Exhibits and Schedules thereto, contain the entire understanding of the parties
with respect to the subject matter hereof and supersede all prior agreements and
understandings, oral or written, with respect to such matters, which the parties
acknowledge have been merged into such documents, exhibits and schedules. At or
after the First Closing, and without further consideration, the


                                       31

Company will execute and deliver to the Purchasers such further documents as may
be reasonably requested in order to give practical effect to the intention of
the parties under the Transaction Documents.

      6.4 Notices. Any and all notices or other communications or deliveries
required or permitted to be provided hereunder shall be in writing and shall be
deemed given and effective on the earliest of (a) the date of transmission, if
such notice or communication is delivered via facsimile at the facsimile number
specified in this Section prior to 5:30 p.m. (New York City time) on a Trading
Day, (b) the next Trading Day after the date of transmission, if such notice or
communication is delivered via facsimile at the facsimile number specified in
this Section on a day that is not a Trading Day or later than 5:30 p.m. (New
York City time) on any Trading Day, (c) the Trading Day following the date of
mailing, if sent by U.S. nationally recognized overnight courier service, or (d)
upon actual receipt by the party to whom such notice is required to be given.
The addresses for such notices and communications are those set forth on the
signature pages hereof, or such other address as may be designated in writing
hereafter, in the same manner, by such Person.

      6.5 Amendments; Waivers. No provision of this Agreement may be waived or
amended except in a written instrument signed by the Company and holders of at
least a majority of the shares of Common Stock issued or issuable upon
conversion of the Shares. No waiver of any default with respect to any
provision, condition or requirement of this Agreement shall be deemed to be a
continuing waiver in the future or a waiver of any subsequent default or a
waiver of any other provision, condition or requirement hereof, nor shall any
delay or omission of either party to exercise any right hereunder in any manner
impair the exercise of any such right.

      6.6 Construction. The headings herein are for convenience only, do not
constitute a part of this Agreement and shall not be deemed to limit or affect
any of the provisions hereof. The language used in this Agreement will be deemed
to be the language chosen by the parties to express their mutual intent, and no
rules of strict construction will be applied against any party.

      6.7 Successors and Assigns. This Agreement shall be binding upon and inure
to the benefit of the parties and their successors and permitted assigns. The
Company may not assign this Agreement or any rights or obligations hereunder
without the prior written consent of the Purchasers. Any Purchaser may only
assign its rights under this Agreement and the Registration Rights Agreement
pursuant to a Qualified Transfer.

      6.8 No Third-Party Beneficiaries. This Agreement is intended for the
benefit of the parties hereto and their respective successors and permitted
assigns and is not for the benefit of, nor may any provision hereof be enforced
by, any other Person, except that each Related Person is an intended third party
beneficiary of Section 4.10 and may enforce the provisions of such Section
directly against the Company.

      6.9 Governing Law; Venue; Waiver Of Jury Trial. THE CORPORATE LAWS OF THE
STATE OF DELAWARE SHALL GOVERN ALL ISSUES CONCERNING THE RELATIVE RIGHTS OF THE
COMPANY AND ITS STOCKHOLDERS. ALL QUESTIONS CONCERNING THE CONSTRUCTION,
VALIDITY, ENFORCEMENT AND INTERPRETATION OF THIS AGREEMENT SHALL BE GOVERNED BY
AND


                                       32

CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.
EACH PARTY HEREBY IRREVOCABLY SUBMITS TO THE EXCLUSIVE JURISDICTION OF THE STATE
AND FEDERAL COURTS SITTING IN THE CITY OF NEW YORK, BOROUGH OF MANHATTAN, FOR
THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION HEREWITH OR WITH ANY
TRANSACTION CONTEMPLATED HEREBY OR DISCUSSED HEREIN (INCLUDING WITH RESPECT TO
THE ENFORCEMENT OF ANY OF THE TRANSACTION DOCUMENTS), AND HEREBY IRREVOCABLY
WAIVES, AND AGREES NOT TO ASSERT IN ANY SUIT, ACTION OR PROCEEDING, ANY CLAIM
THAT IT IS NOT PERSONALLY SUBJECT TO THE JURISDICTION OF ANY SUCH COURT, THAT
SUCH SUIT, ACTION OR PROCEEDING IS IMPROPER. EACH PARTY HEREBY IRREVOCABLY
WAIVES PERSONAL SERVICE OF PROCESS AND CONSENTS TO PROCESS BEING SERVED IN ANY
SUCH SUIT, ACTION OR PROCEEDING BY MAILING A COPY THEREOF VIA REGISTERED OR
CERTIFIED MAIL OR OVERNIGHT DELIVERY (WITH EVIDENCE OF DELIVERY) TO SUCH PARTY
AT THE ADDRESS IN EFFECT FOR NOTICES TO IT UNDER THIS AGREEMENT AND AGREES THAT
SUCH SERVICE SHALL CONSTITUTE GOOD AND SUFFICIENT SERVICE OF PROCESS AND NOTICE
THEREOF. NOTHING CONTAINED HEREIN SHALL BE DEEMED TO LIMIT IN ANY WAY ANY RIGHT
TO SERVE PROCESS IN ANY MANNER PERMITTED BY LAW. THE COMPANY HEREBY WAIVES ALL
RIGHTS TO A TRIAL BY JURY.

      6.10 Survival. The representations, warranties, agreements and covenants
contained herein shall survive each Closing and the delivery, conversion and/or,
exercise of the Securities, as applicable.

      6.11 Execution. This Agreement may be executed in two or more
counterparts, all of which when taken together shall be considered one and the
same agreement and shall become effective when counterparts have been signed by
each party and delivered to the other party, it being understood that both
parties need not sign the same counterpart. In the event that any signature is
delivered by facsimile transmission, such signature shall create a valid and
binding obligation of the party executing (or on whose behalf such signature is
executed) with the same force and effect as if such facsimile signature page
were an original thereof.

      6.12 Severability. If any provision of this Agreement is held to be
invalid or unenforceable in any respect, the validity and enforceability of the
remaining terms and provisions of this Agreement shall not in any way be
affected or impaired thereby and the parties will attempt to agree upon a valid
and enforceable provision that is a reasonable substitute therefor, and upon so
agreeing, shall incorporate such substitute provision in this Agreement.

      6.13 Rescission and Withdrawal Right. Notwithstanding anything to the
contrary contained in (and without limiting any similar provisions of) the
Transaction Documents, whenever any Purchaser exercises a right, election,
demand or option under a Transaction Document and the Company does not timely
perform its related obligations within the periods therein provided, then such
Purchaser may rescind or withdraw, in its sole discretion from time to time upon
written notice to the Company, any relevant notice, demand or election in whole
or in part without prejudice to its future actions and rights.


                                       33

      6.14 Replacement of Securities. If any certificate or instrument
evidencing any Securities or shares of Series C Preferred Stock is mutilated,
lost, stolen or destroyed, the Company shall issue or cause to be issued in
exchange and substitution for and upon cancellation thereof, or in lieu of and
substitution therefor, a new certificate or instrument, but only upon receipt of
evidence reasonably satisfactory to the Company of such loss, theft or
destruction and customary and reasonable indemnity, if requested. The applicants
for a new certificate or instrument under such circumstances shall also pay any
reasonable third-party costs associated with the issuance of such replacement
Securities or shares of Series C Preferred Stock.

      6.15 Remedies. In addition to being entitled to exercise all rights
provided herein or granted by law, including recovery of damages, each of the
Purchasers and the Company will be entitled to specific performance under the
Transaction Documents. The parties agree that monetary damages may not be
adequate compensation for any loss incurred by reason of any breach of
obligations described in the foregoing sentence and hereby agrees to waive in
any action for specific performance of any such obligation the defense that a
remedy at law would be adequate.

      6.16 Payment Set Aside. To the extent that the Company makes a payment or
payments to any Purchaser pursuant to any Transaction Document or a Purchaser
enforces or exercises its rights thereunder, and such payment or payments or the
proceeds of such enforcement or exercise or any part thereof are subsequently
invalidated, declared to be fraudulent or preferential, set aside, recovered
from, disgorged by or are required to be refunded, repaid or otherwise restored
to the Company, a trustee, receiver or any other person under any law
(including, without limitation, any bankruptcy law, state or federal law, common
law or equitable cause of action), then to the extent of any such restoration
the obligation or part thereof originally intended to be satisfied shall be
revived and continued in full force and effect as if such payment had not been
made or such enforcement or setoff had not occurred.

      6.17 Usury. To the extent it may lawfully do so, the Company hereby agrees
not to insist upon or plead or in any manner whatsoever claim, and will resist
any and all efforts to be compelled to take the benefit or advantage of, usury
laws wherever enacted, now or at any time hereafter in force, in connection with
any claim, action or proceeding that may be brought by any Purchaser in order to
enforce any right or remedy under any Transaction Document. Notwithstanding any
provision to the contrary contained in any Transaction Document, it is expressly
agreed and provided that the total liability of the Company under the
Transaction Documents for payments in the nature of interest shall not exceed
the maximum lawful rate authorized under applicable law (the "Maximum Rate"),
and, without limiting the foregoing, in no event shall any rate of interest or
default interest, or both of them, when aggregated with any other sums in the
nature of interest that the Company may be obligated to pay under the
Transaction Documents exceed such Maximum Rate. It is agreed that if the maximum
contract rate of interest allowed by law and applicable to the Transaction
Documents is increased or decreased by statute or any official governmental
action subsequent to the date hereof, the new maximum contract rate of interest
allowed by law will be the Maximum Rate of interest applicable to the
Transaction Documents from the effective date forward, unless such application
is precluded by applicable law. If under any circumstances whatsoever, interest
in excess of the Maximum Rate is paid by the Company to any Purchaser with
respect to indebtedness evidenced by the Transaction Documents, such excess
shall be applied by such Purchaser to the unpaid


                                       34

principal balance of any such indebtedness or be refunded to the Company, the
manner of handling such excess to be at such Purchaser's election.

      6.18 Independent Nature of Purchasers. The obligations of each Purchaser
under any Transaction Document are several and not joint with the obligations of
any other Purchaser, and no Purchaser shall be responsible in any way for the
performance of the obligations of any other Purchaser under any Transaction
Document. The decision of each Purchaser to purchase Shares pursuant to this
Agreement has been made by such Purchaser independently of any other Purchaser
and independently of any information, materials, statements or opinions as to
the business, affairs, operations, assets, properties, liabilities, results of
operations, condition (financial or otherwise) or prospects of the Company or of
the Subsidiary which may have been made or given by any other Purchaser or by
any agent or employee of any other Purchaser, and no Purchaser or any of its
agents or employees shall have any liability to any other Purchaser (or any
other person) relating to or arising from any such information, materials,
statements or opinions. Nothing contained herein or in any Transaction Document,
and no action taken by any Purchaser pursuant thereto, shall be deemed to
constitute the Purchasers as a partnership, an association, a joint venture or
any other kind of entity, or create a presumption that the Purchasers are in any
way acting in concert or as a group with respect to such obligations or the
transactions contemplated by the Transaction Document. Each Purchaser shall be
entitled to independently protect and enforce its rights, including without
limitation the rights arising out of this Agreement or out of the other
Transaction Documents, and it shall not be necessary for any other Purchaser to
be joined as an additional party in any proceeding for such purpose.

      6.19 Adjustments in Share Numbers and Prices. In the event of any stock
split, subdivision, dividend or distribution payable in shares of Common Stock
(or other securities or rights convertible into, or entitling the holder thereof
to receive directly or indirectly shares of Common Stock), combination or other
similar recapitalization or event occurring after the date hereof, each
reference in this Agreement to a number of shares or a price per share shall be
amended to appropriately account for such event.

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                             SIGNATURE PAGES FOLLOW]


                                       35

      IN WITNESS WHEREOF, the parties hereto have caused this Amended and
Restated Securities Purchase Agreement to be duly executed by their respective
authorized signatories as of the date first indicated above.


                                   ASPEN TECHNOLOGY, INC.

                                   By:  /s/ Lisa W. Zappala
                                       --------------------------------------
                                   Name:  Lisa W. Zappala
                                   Title: Senior Vice President and
                                          Chief Financial Officer

                                   Address for Notice:

                                   10 Canal Park
                                   Cambridge, Massachusetts 02141
                                   Facsimile No.:(617) 949-1722
                                   Telephone No.:(617) 949-1000
                                   Attn:  Chief Executive Officer and General
                                   Counsel

                                   With a copy to:

                                         Hale and Dorr LLP
                                         60 State Street
                                         Boston, Massachusetts 02109
                                         Facsimile No.: (617) 526-5000
                                         Telephone No.: (617) 526-6000
                                         Attn: Mark L. Johnson, Esq.


                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                     SIGNATURE PAGES FOR PURCHASERS FOLLOW]


                                       36

                                    PINE RIDGE FINANCIAL INC.

                                    By: /s/ Miriam Hyman
                                       --------------------------------
                                    Name: Miriam Hyman
                                    Title: Assistant Secretary
                                    Pine Ridge Financial Inc.
                                    c/o Cavallo Capital Corp.
                                    660 Madison Avenue
                                    New York, NY 10022
                                    Facsimile No.: (212) 651-9010
                                    Telephone No.: (212) 651-9000
                                    Attn:  Avi Vigder

                                    With a copy to
                                          Proskauer Rose LLP
                                          1585 Broadway
                                          New York, New York 10036-8299
                                          Facsimile No.: (212) 969-2900
                                          Telephone No.: (212) 969-3000
                                          Attn: Adam J. Kansler, Esq.


                                       37

                                    SMITHFIELD FIDUCIARY LLC


                                    By: /s/ Adam J. Chill
                                       -----------------------------------
                                    Name:  Adam J. Chill
                                    Title: Authorized Signatory

                                    Address for Notice:

                                    Smithfield Fiduciary LLC
                                    c/o Highbridge Capital Management, LLC
                                    9 West 57th Street, 27th Floor
                                    New York, New York 10019
                                    Facsimile No.: (212) 751-0755
                                    Telephone No.: (212) 287-4720
                                    Attn: Ari J. Storch / Adam J. Chill

                                    With a copy to
                                          Proskauer Rose LLP
                                          1585 Broadway
                                          New York, New York 10036-8299
                                          Facsimile No.: (212) 969-2900
                                          Telephone No.: (212) 969-3000
                                          Attn: Adam J. Kansler, Esq.


                                       38

                                    PERSEVERANCE LLC


                                    By: /s/ Fiona Theaker
                                       --------------------------------
                                    Name:  Fiona Theaker
                                    Title: Director

                                    Perseverance LLC.
                                    c/o Cavallo Capital Corp.
                                    660 Madison Avenue
                                    New York, NY  10022
                                    Facsimile No.: (212) 651-9010
                                    Telephone No.: (212) 651-9000
                                    Attn: Avi Vigder

                                    With a copy to
                                          Proskauer Rose LLP
                                          1585 Broadway
                                          New York, New York 10036-8299
                                          Facsimile No.: (212) 969-2900
                                          Telephone No.: (212) 969-3000
                                          Attn: Adam J. Kansler, Esq.


                                       39

                                TABLE OF CONTENTS

Page Number ------ ARTICLE I DEFINITIONS ...................................................... 1 1.1 Definitions ...................................................... 1 ARTICLE II PURCHASE AND SALE ................................................ 8 2.1 Sale and Issuance of Preferred Stock at First Closing ............ 8 2.2 Sale and Issuance of Preferred Stock at Second Closing ........... 8 2.3 Exchange, Sale and Issuance of Preferred Stock at Third Closing .. 8 2.4 Closings ......................................................... 9 2.5 First Closing Deliveries ......................................... 9 2.6 Second Closing Deliveries ........................................ 10 2.7 Third Closing Deliveries ......................................... 10 2.8 Warrants ......................................................... 12 ARTICLE III REPRESENTATIONS AND WARRANTIES ................................... 12 3.1 Representations and Warranties of the Company .................... 12 3.2 Representations and Warranties of the Purchasers ................. 19 ARTICLE IV OTHER AGREEMENTS OF THE PARTIES .................................. 20 4.1 Transfer Restrictions ............................................ 20 4.2 Acknowledgment of Dilution ....................................... 22 4.3 Furnishing of Information ........................................ 22 4.4 Integration ...................................................... 22 4.5 Reservation and Listing of Securities ............................ 23 4.6 Conversion and Exercise Procedures ............................... 25 4.7 Subsequent Placements ............................................ 25 4.8 Securities Laws Disclosure; Publicity ............................ 27 4.9 Repurchase Upon Occurrence of a Bankruptcy Event ................. 27 4.10 Reimbursement .................................................... 28 4.11 Default Interest ................................................. 29 4.12 Rights of Shareholders ........................................... 29 4.13 Shareholders Rights Plan ......................................... 29 4.14 Certain Trading Limitations ...................................... 29 4.15 Limitation on Issuance and Amendment of Series C Preferred Stock . 29 4.16 Certificate of Elimination ....................................... 30 4.17 Rule 144 ......................................................... 30 ARTICLE V CONDITIONS ....................................................... 30 5.1 Conditions Precedent to the Obligations of the Purchasers ........ 30 5.2 Conditions Precedent to the Obligations of the Company ........... 31 ARTICLE VI MISCELLANEOUS .................................................... 31 6.1 Termination ...................................................... 31 6.2 Fees and Expenses ................................................ 31 6.3 Entire Agreement ................................................. 31 6.4 Notices .......................................................... 32 6.5 Amendments; Waivers .............................................. 32 6.6 Construction ..................................................... 32
6.7 Successors and Assigns ........................................... 32 6.8 No Third-Party Beneficiaries ..................................... 32 6.9 Governing Law; Venue; Waiver Of Jury Trial ....................... 32 6.10 Survival ......................................................... 33 6.11 Execution ........................................................ 33 6.12 Severability ..................................................... 33 6.13 Rescission and Withdrawal Right .................................. 33 6.14 Replacement of Securities ........................................ 34 6.15 Remedies ......................................................... 34 6.16 Payment Set Aside ................................................ 34 6.17 Usury ............................................................ 34 6.18 Independent Nature of Purchasers ................................. 35 6.19 Adjustments in Share Numbers and Prices .......................... 35
Exhibits: A-1 Form of Initial Series B Certificate of Designations A-2 Form of Series B Certificate of Designations A-3 Form of Series C Certificate of Designations B Registration Rights Agreement C-1 Form of Warrant for First Closing C-2 Form of Warrant for Second Closing C-3 Form of Warrant for Third Closing D Opinion of Company Counsel for First Closing E Opinion of Company Counsel for Second Closing F Opinion of Company Counsel for Third Closing G Form of Amendment to Warrants Schedules: 3.1(a) Subsidiaries 3.1(g) Capitalization 3.1(o) Broker Fees 3.1(s) Registration Rights Schedule A PURCHASERS
- ----------------------------------------------------------------------------------------------- NAME AND ADDRESS OF INITIAL FIRST SECOND SECOND THIRD THIRD PURCHASERS SHARES CLOSING CLOSING CLOSING CLOSING CLOSING PURCHASE SHARES PURCHASE SHARES PURCHASE PRICE PRICE PRICE - ----------------------------------------------------------------------------------------------- Pine Ridge Financial Inc. 15,000 $15,000,000 10,000 $10,000,000 4,000 $ 4,000,000 c/o Cavallo Capital Corp. 660 Madison Avenue New York, NY 10022 - ----------------------------------------------------------------------------------------------- - ----------------------------------------------------------------------------------------------- Smithfield Fiduciary LLC 9,000 $ 9,000,000 6,000 $ 6,000,000 6,000 $ 6,000,000 c/o Highbridge Capital Management, LLC 9 West 57th Street 27th Floor New York, NY 10019 - ----------------------------------------------------------------------------------------------- - ----------------------------------------------------------------------------------------------- Perseverance LLC 6,000 $ 6,000,000 4,000 $ 4,000,000 -- -- c/o Cavallo Capital Corp. 660 Madison Avenue New York, NY 10022 - ----------------------------------------------------------------------------------------------- - ----------------------------------------------------------------------------------------------- - ----------------------------------------------------------------------------------------------- Totals 30,000 $30,000,000 20,000 $20,000,000 10,000 $10,000,000 - -----------------------------------------------------------------------------------------------

                                                                    Exhibit 99.2

                              AMENDED AND RESTATED
                          REGISTRATION RIGHTS AGREEMENT

      This Amended and Restated Registration Rights Agreement (this "AGREEMENT")
is made and entered into as of March 19, 2002, among Aspen Technology, Inc., a
Delaware corporation (the "COMPANY"), and the investors signatory hereto (each
such investor is a "Purchaser" and all such investors are, collectively, the
"PURCHASERS").

      WHEREAS, the Company and the Purchasers entered into a Registration Rights
Agreement, dated as of February 6, 2002 (the "ORIGINAL REGISTRATION RIGHTS
AGREEMENT") pursuant to which the Company and the Purchasers provided for
certain arrangements with respect to the registration of shares of common stock
of the Company under the Securities Act of 1933, as amended;

      WHEREAS, the Company and the Purchasers are contemporaneously entering
into the Amended and Restated Securities Purchase Agreement dated as of the date
hereof (the "PURCHASE AGREEMENT") and consummating the Third Closing under the
Purchase Agreement; and

      WHEREAS, in connection with the execution and delivery of the Purchase
Agreement and the consummation of the Third Closing, the Company and the
Purchasers wish to amend certain provisions of the Original Registration Rights
Agreement;

      NOW, THEREFORE, IN CONSIDERATION of the mutual covenants contained in this
Agreement, and for other good and valuable consideration the receipt and
adequacy of which are hereby acknowledged, the Company and the Purchasers agree
that the terms of the Original Registration Rights Agreement shall be amended
and restated as follows:

      1. Definitions. In addition to the terms defined elsewhere in this
Agreement, (a) capitalized terms that are not otherwise defined herein have the
meanings given to such terms in the Purchase Agreement, and (b) the following
terms have the meanings indicated:

            "FILING DATE" means, with respect to the initial Registration
      Statement required to be filed pursuant to Section 2, March 25, 2002, and,
      with respect to any additional Registration Statements that may be
      required pursuant to Section 3(c), the 15th day following the date on
      which the Company first knows, or reasonably should have known, that such
      additional Registration Statement is required under such Section.

            "HOLDER" means any holder, from time to time, of Registrable
      Securities.

            "PROSPECTUS" means the prospectus included in the Registration
      Statement (including, without limitation, a prospectus that includes any
      information previously omitted from a prospectus filed as part of an
      effective registration statement in reliance upon Rule 430A promulgated
      under the Securities Act), as amended or supplemented by any prospectus
      supplement, with respect to the terms of the offering of any portion of
      the Registrable Securities covered by the Registration Statement, and all
      other amendments and supplements to the Prospectus, including
      post-effective amendments, and all material incorporated by reference or
      deemed to be incorporated by reference in such Prospectus.

            "REGISTRABLE SECURITIES" means any Common Stock (including
      Underlying Shares) issued or issuable pursuant to the Transaction
      Documents, together with any securities issued or issuable upon any stock
      split, dividend or other distribution, recapitalization or similar event
      with respect to the foregoing.

            "REGISTRATION STATEMENT" means the initial registration statement
      required to be filed hereunder and any additional registration statements
      contemplated by Section 3(c), including (in each case) the Prospectus,
      amendments and supplements to such registration statement or Prospectus,
      including pre- and post-effective amendments, all exhibits thereto, and
      all material incorporated by reference or deemed to be incorporated by
      reference in such registration statement.

            "REQUIRED EFFECTIVENESS DATE" means, with respect to the initial
      Registration Statement required to be filed hereunder, May 30, 2002, and,
      with respect to any additional Registration Statements that may be
      required pursuant to Section 3(c), the 60th day following the date on
      which such additional Registration Statement is required to be filed
      hereunder.

            "RULE 415," "RULE 424" and "RULE 461" means Rule 415, Rule 424 and
      Rule 461, respectively, promulgated by the Commission pursuant to the
      Securities Act, as such Rules may be amended from time to time, or any
      similar rule or regulation hereafter adopted by the Commission having
      substantially the same effect as such Rule.

            "SPECIAL COUNSEL" means one special counsel to the Holders. Unless
      the Holders notify the Company otherwise, the Special Counsel will be the
      Purchaser Counsel identified in the Purchase Agreement.

      2. Shelf Registration

            (a) As promptly as possible, and in any event on or prior to each
Filing Date, the Company shall prepare and file with the Commission a "shelf"
Registration Statement covering the resale of all Registrable Securities for an
offering to be made on a continuous basis pursuant to Rule 415. The Registration
Statement shall be on Form S-3 (except if the Company is not then eligible to
register for resale the Registrable Securities on Form S-3, in which case such
registration shall be on such other form as the Company is eligible to use, and
shall contain (except if otherwise directed by the Holders) the "Plan of
Distribution" attached hereto as Annex A. The Company shall use its best efforts
to cause the Registration Statement to be declared effective under the
Securities Act as promptly as possible after the filing thereof, but in any
event on or prior to the Required Effectiveness Date, and shall use its best
efforts to keep such Registration Statement continuously effective under the
Securities Act until the earlier of (i) the second anniversary of the Third
Closing and (ii) when all Registrable Securities covered by such Registration
Statement have been sold (the "EFFECTIVENESS PERIOD"). The Company shall notify
each Holder in writing promptly (and in any event within one business day) after
receiving notification from the Commission that a Registration Statement has
been declared effective.


                                       2

            (b) The initial Registration Statement to be filed hereunder shall
cover the sale by the Holders of at least the Required Minimum number of shares
of Common Stock.

            (c) Notwithstanding anything in this Agreement to the contrary, if
after the Third Closing and prior to the Required Effectiveness Date applicable
to the initial Registration Statement to be filed hereunder, the Company is
engaged in a material merger, acquisition or sale and the Board of Directors
determines in good faith, by appropriate resolutions, that, as a result of such
activity, (A) it would be materially detrimental to the Company (other than as
relating solely to the price of the Common Stock) to file a Registration
Statement at such time and (B) it is in the best interests of the Company to
defer proceeding with such registration at such time, then the Filing Date for
the initial Registration Statement to be filed hereunder may be extended and the
Required Effectiveness Date may be extended, but the Required Effectiveness Date
shall not be extended, in any event, beyond June 28, 2002. In no event, however,
shall this right be exercised to delay the filing of or proceeding with a
Registration Statement beyond the period during which (in the good faith
determination of the Company's Board of Directors) such filing or proceeding
would be materially detrimental to the Company.

            (d) Notwithstanding anything in this Agreement to the contrary,
after 20 consecutive trading days of continuous effectiveness of the initial
Registration Statement filed and declared effective pursuant to this Agreement,
the Company may, by written notice to the Holders, suspend sales under a
Registration Statement after the effective date thereof and/or require that the
Holders immediately cease the sale of shares of Common Stock pursuant thereto
and/or defer the filing of any subsequent Registration Statement if:

                  (i) the Company is engaged in a material merger, acquisition
            or sale and the Board of Directors determines in good faith, by
            appropriate resolutions, that, as a result of such activity, (A) it
            would be materially detrimental to the Company (other than as
            relating solely to the price of the Common Stock) to file a
            Registration Statement at such time and (B) it is in the best
            interests of the Company to defer proceeding with such registration
            at such time, or

                  (ii) the Company files a Registration Statement with the
            Commission for the purpose of registering under the Securities Act
            any securities to be publicly offered and sold by the Company in a
            bona fide firm commitment underwritten offering.

            Upon receipt of such notice, each Holder shall immediately
discontinue any sales of Registrable Securities pursuant to such registration
until such Holder has received copies of a supplemented or amended Prospectus or
until such Holder is advised in writing by the Company that the then-current
Prospectus may be used and has received copies of any additional or supplemental
filings that are incorporated or deemed incorporated by reference in such
Prospectus. In no event, however, shall this right be exercised to suspend sales
beyond the period during which (in the good faith determination of the Company's
Board of Directors) the failure to require such suspension would be materially
detrimental to the Company. The Company's rights under this Section 2(d) may be
exercised (A) with respect to clause (i) above, not more than three (3) times
(which may be consecutive) in any twelve-month period and may not be exercised
for a period of more than 30 days each, and (B) with respect to clause (ii)
above, not


                                       3

more than one (1) time and may not be exercised for a period of more than 20
days in any twelve-month period. In no event may the Company exercise its rights
pursuant to subclauses (A) and (B) above for an aggregate of more than 90 days.
Immediately after the end of any suspension period under this Section 2(d), the
Company shall take all necessary actions (including filing any required
supplemental prospectus) to restore the effectiveness of the applicable
Registration Statement and the ability of the Holders to publicly resell their
Registrable Securities pursuant to such effective Registration Statement.

            (e) Upon the occurrence of any Event (as defined below) and on every
monthly anniversary thereof until the applicable Event is cured, as partial
relief for the damages suffered therefrom by the Holders (which remedy shall not
be exclusive of any other remedies available at law or in equity), the Company
shall pay to each Holder an amount (the "Registration Damage Amount"), as
liquidated damages and not as a penalty, equal to 1.0% for the first two months
and 2% for each month thereafter of the aggregate purchase price paid under the
Purchase Agreement for the Securities held by such Holder, with such purchase
price being allocated between the Shares and Warrants in the same manner as such
purchase price is allocated for the purposes of the Company's consolidated
financial statements, provided that the Registration Damage Amount shall not
accrue after the date, if any, on which such Holder has exercised its rights
under Section 10 of the Series B Certificate of Designations to have the Company
repurchase its Shares or Underlying Shares with respect to such repurchased
interest. The Registration Damage Amount payable pursuant to the terms hereof
shall apply on a pro-rata basis for any portion of a month prior to the cure of
an Event. The accrued but unpaid Registration Damage Amount payable to each
Holder shall be paid on the last day of each calendar month, and may be paid at
the Company's option in cash or in Series C Preferred Stock. The Company shall
deliver written notice to the Holders indicating the manner in which it intends
to pay the Registration Damage Amount at least five Trading Days before the
payment date for such Registration Damage Amount. Failure to timely provide such
written notice shall be deemed an election by the Company to make the payment in
cash. In the event that the Company elects to pay the Registration Damage Amount
in shares of Series C Preferred Stock, the number of shares of Series C
Preferred Stock to be issued to the Holder in payment of the Registration Damage
Amount shall be determined by dividing the total Registration Damage Amount then
payable to such Holder with respect to all of such Holder's Shares and Warrants
by $10,000 (the initial Stated Value per share of the Series C Preferred Stock)
and rounding downward to the nearest whole number of shares of Series C
Preferred Stock. In addition, the Company shall pay to the Holder in cash the
amount, if any, by which the Registration Damage Amount payable to such Holder
exceeds the aggregate Stated Value of the Series C Preferred Stock issued
pursuant to the preceding sentence. If the total Redemption Price payable to the
Holder is less than $10,000, then the Corporation shall pay such amount to such
Holder entirely in cash. For purposes hereof, each of the following shall
constitute an "Event":

                  (i) a Registration Statement is not filed on or prior to the
            applicable Filing Date or is not declared effective on or prior to
            the applicable Required Effectiveness Date, except as a result of an
            extension permitted pursuant to Section 2(c); or

                  (ii) after the Effective Date for a Registration Statement and
            until the end of the Effectiveness Period, a Holder is not permitted
            to sell Registrable


                                       4

            Securities under such Registration Statement (or a subsequent
            Registration Statement filed in replacement thereof) for any reason
            except (A) as a result of a suspension permitted pursuant to Section
            2(d) and (B) for five or more Trading Days, whether or not
            consecutive, for which such sales are not permitted other than as a
            result of a suspension pursuant to Section 2(d).

                  (iii) the Common Stock is not listed or quoted, or is
            suspended from trading, on an Eligible Market for a period of five
            consecutive Trading Days or ten aggregate Trading Days in any
            365-day period;

                  (iv) the Company fails for any reason to deliver a certificate
            evidencing any Securities to a Holder within ten Trading Days after
            delivery of such certificate is required pursuant to any Transaction
            Document or the exercise or conversion rights of the Holders
            pursuant to the Transaction Documents are otherwise suspended for
            any reason;

                  (v) the Company fails to have available both (A) a sufficient
            number of authorized but unissued and otherwise unreserved shares of
            Common Stock available to issue Underlying Shares upon any exercise
            of the Warrants or any conversion of the Shares and does not make
            available a sufficient number of authorized but unissued and
            otherwise unreserved shares of Common Stock for such issuance within
            60 days after the occurrence of such deficiency and (B) at least
            6,401,394 authorized but unissued and otherwise unreserved shares of
            Common Stock (as adjusted for any stock splits, stock combinations
            or similar events), less any shares of Common Stock issued upon
            conversion of the Shares, as dividends on the Shares, upon exercise
            of the Warrants or upon redemption of the Shares; or

                  (vi) after the Effective Date for a Registration Statement,
            any Registrable Securities covered by such Registration Statement
            are not listed on an Eligible Market.

            (f) At the election of any Holder, any Registration Damage Amount
required to be paid by the Company to such Holder pursuant to Section 2(e) may
instead be added to the Stated Value of the outstanding Series B Preferred Stock
then owned by such Holder. A Holder may make such election by delivering written
notice to the Company at any time before payment of such Registration Damage
Amount is received by such Holder.

            (g) If (i) any Event occurs and remains uncured for 60 days; (ii)
the Company fails to make any cash payment required under the Transaction
Documents and such failure is not cured within five days after notice of such
default is first given to the Company by a Holder; or (iii) the Company defaults
in the timely performance of any other obligation under the Transaction
Documents and such default continues uncured for a period of 20 days after the
date on which notice of such default is first given to the Company by a Holder
(it being understood that no prior notice need be given in the case of a default
that cannot reasonably be cured within 20 days), then at any time or times
thereafter any Holder may deliver to the Company a notice (a "Repurchase
Notice") requiring the Company to repurchase all or any portion of the Shares


                                       5

and any Underlying Shares issued upon conversion of the Shares then held by such
Holder at a price per share equal to the Event Equity Value (measured based on
the Underlying Shares into which Shares or Warrants are convertible or
exercisable, without giving effect to any limitations on conversion or
exercise). Notwithstanding the foregoing, if the Holder is entitled to deliver
the Repurchase Notice for the reasons set forth in clause (i) hereof, and the
Holder is entitled to receive payments in accordance with Section 2(e), then the
Holder shall deliver such Repurchase Notice to the Company either (x) within
three days of the date on which the Event occurred, or (y) if not delivered to
the Company within three days, then no earlier than the 61st day following the
date on which the Event occurred. If a Holder delivers a Repurchase Notice
pursuant to this Section, the Company shall pay the aggregate repurchase price
(together with any other payments, expenses and liquidated damages then due and
payable pursuant to the Transaction Documents) to such Holder in cash or in
shares of Series C Preferred Stock, at the option of the Company, no later than
the fifth Trading Day following the date of delivery of the Repurchase Notice,
and upon receipt thereof such Holder shall deliver original certificates
evidencing the Securities so repurchased to the Company (to the extent such
certificates have been delivered to such Holder). Notwithstanding the foregoing,
immediately upon the occurrence of a Bankruptcy Event, each Holder will
automatically be deemed to have delivered a Repurchase Notice pursuant to this
Section and will be entitled to receive the corresponding repurchase price
without any further action or notice to the Company, except that, in the event
of an event described in clause (a), (e), (f) or (g) of the definition of
"Bankruptcy Event" set forth in the Purchase Agreement, the Company shall not
have the option to elect to pay the repurchase price in shares of Series C
Preferred Stock. In the event that the Company elects to pay the aggregate
repurchase price (together with such other payments, expenses and liquidated
damages as aforesaid) in shares of Series C Preferred Stock, the number of such
shares shall be determined in the manner described in the sixth and seventh
sentences of Section 2(e).

      3. Registration Procedures. In connection with the Company's registration
obligations hereunder, the Company shall:

            (a) Not less than three Trading Days prior to the filing of each
Registration Statement or any related Prospectus or any amendment or supplement
thereto (including any document that would be incorporated or deemed to be
incorporated therein by reference), the Company shall (i) furnish to the Holders
and their Special Counsel copies of all such documents proposed to be filed,
which documents (other than those incorporated or deemed to be incorporated by
reference) will be subject to the review of such Holders and their Special
Counsel, and (ii) cause its officers and directors, counsel and independent
certified public accountants to respond to such inquiries as shall be necessary,
in the reasonable opinion of respective counsel, to conduct a reasonable
investigation within the meaning of the Securities Act. The Company shall not
file the Registration Statement or any such Prospectus or any amendments or
supplements thereto to which the Holders of a majority of the Registrable
Securities and their Special Counsel shall reasonably object, provided that such
objection is communicated to the Company within three Trading Days of receipt of
such documents.

            (b) (i) Prepare and file with the Commission such amendments,
including post-effective amendments, to the Registration Statement and the
Prospectus used in connection therewith as may be necessary to keep the
Registration Statement continuously effective as to the applicable Registrable
Securities for the Effectiveness Period and prepare and file with the


                                       6

Commission such additional Registration Statements in order to register for
resale under the Securities Act all of the Registrable Securities; (ii) cause
the related Prospectus to be amended or supplemented by any required Prospectus
supplement, and as so supplemented or amended to be filed pursuant to Rule 424;
and (iii) respond as promptly as reasonably possible, and in any event within
ten Trading Days, to any comments received from the Commission with respect to
the Registration Statement or any amendment thereto and as promptly as
reasonably possible provide the Special Counsel true and complete copies of all
correspondence from and to the Commission relating to the Registration
Statement.

            (c) If, on any date the number of shares of Common Stock previously
registered under all existing Registration Statements is less than 125% of the
Actual Minimum on such date, file an additional Registration Statement covering
a number of shares of Common Stock at least equal to (i) the Required Minimum on
such date, less (ii) the number of shares of Common Stock previously registered
under all existing Registration Statements; provided that the Company will not
be required at any time to register a number of shares of Common Stock greater
than the maximum number of shares of Common Stock that could possibly be issued
pursuant to the Transaction Documents.

            (d) Notify the Holders of Registrable Securities to be sold and
their Special Counsel as promptly as reasonably possible, and (if requested by
any such Person) confirm such notice in writing no later than one Trading Day
thereafter, of any of the following events: (i) the Commission notifies the
Company whether there will be a "review" of any Registration Statement; (ii) the
Commission comments in writing on any Registration Statement (in which case the
Company shall deliver to each Holder a copy of such comments and of all written
responses thereto); (iii) any Registration Statement or any post-effective
amendment is declared effective; (iv) the Commission or any other Federal or
state governmental authority requests any amendment or supplement to a
Registration Statement or Prospectus or requests additional information related
thereto; (v) the Commission issues any stop order suspending the effectiveness
of any Registration Statement or initiates any Proceedings for that purpose;
(vi) the Company receives notice of any suspension of the qualification or
exemption from qualification of any Registrable Securities for sale in any
jurisdiction, or the initiation or threat of any Proceeding for such purpose; or
(vii) the financial statements included in any Registration Statement become
ineligible for inclusion therein or any statement made in any Registration
Statement or Prospectus or any document incorporated or deemed to be
incorporated therein by reference is untrue in any material respect or any
revision to a Registration Statement, Prospectus or other document is required
so that it will not contain any untrue statement of a material fact or omit to
state any material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading.

            (e) Use its best efforts to avoid the issuance of or, if issued,
obtain the withdrawal of (i) any order suspending the effectiveness of any
Registration Statement or (ii) any suspension of the qualification (or exemption
from qualification) of any of the Registrable Securities for sale in any
jurisdiction as soon as reasonably practicable.

            (f) Furnish to each Holder and their Special Counsel, without
charge, at least one conformed copy of each Registration Statement and each
amendment thereto, including financial statements and schedules, all documents
incorporated or deemed to be incorporated therein by


                                       7

reference, and all exhibits to the extent requested by such Person (including
those previously furnished or incorporated by reference) promptly after the
filing of such documents with the Commission.

            (g) Promptly deliver to each Holder and their Special Counsel,
without charge, as many copies of the Prospectus or Prospectuses (including each
form of prospectus) and each amendment or supplement thereto as such Persons may
reasonably request. The Company hereby consents to the use of such Prospectus
and each amendment or supplement thereto by each of the selling Holders in
connection with the offering and sale of the Registrable Securities covered by
such Prospectus and any amendment or supplement thereto.

            (h) Use its best efforts to list the Registrable Securities covered
by such Registration Statement with each Trading Market;

            (i) Prior to any public offering of Registrable Securities, use its
best efforts to register or qualify or cooperate with the selling Holders and
their Special Counsel in connection with the registration or qualification (or
exemption from such registration or qualification) of such Registrable
Securities for offer and sale under the securities or Blue Sky laws of such
jurisdictions within the United States as any Holder requests in writing, to
keep each such registration or qualification (or exemption therefrom) effective
during the Effectiveness Period and to do any and all other acts or things
necessary or advisable to enable the disposition in such jurisdictions of the
Registrable Securities covered by a Registration Statement.

            (j) Cooperate with the Holders to facilitate the timely preparation
and delivery of certificates representing Registrable Securities to be delivered
to a transferee pursuant to a Registration Statement, which certificates shall
be free, to the extent permitted by the Purchase Agreement, of all restrictive
legends, and to enable such Registrable Securities to be in such denominations
and registered in such names as any such Holders may request.

            (k) Upon the occurrence of any event described in Section 3(d)(vii),
as promptly as reasonably possible, prepare a supplement or amendment, including
a post-effective amendment, to the Registration Statement or a supplement to the
related Prospectus or any document incorporated or deemed to be incorporated
therein by reference, and file any other required document so that, as
thereafter delivered, neither the Registration Statement nor such Prospectus
will contain an untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading.

            (l) Cooperate with any due diligence investigation undertaken by the
Holders in connection with the sale of Registrable Securities, including without
limitation by making available any documents and information; provided that the
Company will not deliver or make available to any Holder material, nonpublic
information.

            (m) If the Holders of a majority of the Registrable Securities being
offered pursuant to a Registration Statement select underwriters for the
offering, the Company shall enter into and perform its obligations under an
underwriting agreement, in usual and customary form,


                                       8

including, without limitation, by providing customary legal opinions, comfort
letters and indemnification and contribution obligations.

      4. Registration Expenses. All fees and expenses incident to the
performance of or compliance with this Agreement by the Company shall be borne
by the Company whether or not any Registrable Securities are sold pursuant to
the Registration Statement. The fees and expenses referred to in the foregoing
sentence shall include, without limitation, (a) all registration and filing fees
(including, without limitation, fees and expenses (i) with respect to filings
required to be made with any Trading Market, and (ii) in compliance with
applicable state securities or Blue Sky laws (including, without limitation,
fees and disbursements of counsel for the Company in connection with Blue Sky
qualifications or exemptions of the Registrable Securities )) and determination
of the eligibility of the Registrable Securities for investment under the laws
of such jurisdictions as requested by the Holders )), (b) printing expenses
(including, without limitation, expenses of printing certificates for
Registrable Securities and of printing prospectuses requested by the Holders),
(c) messenger, telephone and delivery expenses of the Company, (d) fees and
expenses reasonably incurred by Special Counsel up to $5,000, but in no event
shall the aggregate amount paid by the Company to the Special Counsel exceed
$50,000, including the fees and expenses paid pursuant to Section 6.2 of the
Purchase Agreement, and (e) fees and expenses of all other Persons retained by
the Company in connection with the consummation of the transactions contemplated
by this Agreement.

      5. Indemnification

            (a) Indemnification by the Company. In the event of any registration
of Registrable Securities pursuant to this Agreement, the Company shall,
notwithstanding any termination of this Agreement, indemnify and hold harmless
each Holder, the officers, directors, partners, members, agents, brokers
(including brokers who offer and sell Registrable Securities as principal as a
result of a pledge or any failure to perform under a margin call of Common
Stock), investment advisors and employees of each of them, each Person who
controls any such Holder (within the meaning of Section 15 of the Securities Act
or Section 20 of the Exchange Act) and the officers, directors, partners,
members, agents and employees of each such controlling Person, to the fullest
extent permitted by applicable law, from and against any and all Losses, as
incurred, arising out of or relating to any untrue or alleged untrue statement
of a material fact contained in the Registration Statement, any Prospectus or
any form of prospectus or in any amendment or supplement thereto or in any
preliminary prospectus, or arising out of or relating to any omission or alleged
omission of a material fact required to be stated therein or necessary to make
the statements therein (in the case of any Prospectus or form of prospectus or
supplement thereto, in light of the circumstances under which they were made)
not misleading, except to the extent, but only to the extent, that (i) such
untrue statements or omissions are based solely upon information regarding such
Holder furnished in writing to the Company by such Holder expressly for use
therein, or to the extent that such information relates to such Holder or such
Holder's proposed method of distribution of Registrable Securities and was
reviewed and expressly approved in writing by such Holder expressly for use in
the Registration Statement, such Prospectus or such form of Prospectus or in any
amendment or supplement thereto or (ii) in the case of an occurrence of an event
of the type specified in Section 3(d)(v) through (vii), the use by such Holder
of an outdated or defective Prospectus after the Company has notified such
Holder in writing that the Prospectus is outdated or defective and prior to the
receipt by such


                                       9

Holder of the Advice contemplated in Section 6(f). The Company shall notify the
Holders promptly of the institution, threat or assertion of any Proceeding of
which the Company is aware in connection with the transactions contemplated by
this Agreement.

            (b) Indemnification by Holders. Each Holder shall, severally and not
jointly, indemnify and hold harmless the Company, its directors, officers,
agents and employees, each Person who controls the Company (within the meaning
of Section 15 of the Securities Act and Section 20 of the Exchange Act), and the
directors, officers, agents or employees of such controlling Persons, to the
fullest extent permitted by applicable law, from and against all Losses arising
solely out of any untrue statement of a material fact contained in the
Registration Statement, any Prospectus, or any form of prospectus, or in any
amendment or supplement thereto, or arising solely out of any omission of a
material fact required to be stated therein or necessary to make the statements
therein not misleading to the extent, but only to the extent, that such untrue
statement or omission is contained in any information so furnished in writing by
such Holder to the Company specifically for inclusion in such Registration
Statement or such Prospectus. In no event shall the liability of any selling
Holder hereunder be greater in amount than the dollar amount of the net proceeds
received by such Holder upon the sale of the Registrable Securities giving rise
to such indemnification obligation.

            (c) Conduct of Indemnification Proceedings. If any Proceeding shall
be brought or asserted against any Person entitled to indemnity hereunder (an
"INDEMNIFIED PARTY"), such Indemnified Party shall promptly notify the Person
from whom indemnity is sought (the "INDEMNIFYING PARTY") in writing, and the
Indemnifying Party shall have the right to assume the defense thereof, including
the employment of counsel reasonably satisfactory to the Indemnified Party and
the payment of all fees and expenses incurred in connection with defense
thereof; provided that the failure of any Indemnified Party to give such notice
shall not relieve the Indemnifying Party of its obligations or liabilities
pursuant to this Agreement, except (and only) to the extent that it shall be
finally determined by a court of competent jurisdiction (which determination is
not subject to appeal or further review) that such failure shall have
proximately and materially adversely prejudiced the Indemnifying Party.

            An Indemnified Party shall have the right to employ separate counsel
in any such Proceeding and to participate in the defense thereof, but the fees
and expenses of such counsel shall be at the expense of such Indemnified Party
or Parties unless: (i) the Indemnifying Party has agreed in writing to pay such
fees and expenses; or (ii) the Indemnifying Party shall have failed promptly to
assume the defense of such Proceeding and to employ counsel reasonably
satisfactory to such Indemnified Party in any such Proceeding; or (iii) the
named parties to any such Proceeding (including any impleaded parties) include
both such Indemnified Party and the Indemnifying Party, and such Indemnified
Party shall have been advised by counsel that a conflict of interest is likely
to exist if the same counsel were to represent such Indemnified Party and the
Indemnifying Party (in which case, if such Indemnified Party notifies the
Indemnifying Party in writing that it elects to employ separate counsel at the
expense of the Indemnifying Party, the Indemnifying Party shall not have the
right to assume the defense thereof and such counsel shall be at the expense of
the Indemnifying Party). The Indemnifying Party shall not be liable for any
settlement of any such Proceeding effected without its written consent, which
consent shall not be unreasonably withheld. No Indemnifying Party shall, without
the prior written consent of the Indemnified Party, effect any settlement of any
pending Proceeding in


                                       10

respect of which any Indemnified Party is a party, unless such settlement
includes an unconditional release of such Indemnified Party from all liability
on claims that are the subject matter of such Proceeding.

            All fees and expenses of the Indemnified Party (including reasonable
fees and expenses to the extent incurred in connection with investigating or
preparing to defend such Proceeding in a manner not inconsistent with this
Section) shall be paid to the Indemnified Party, as incurred, within ten Trading
Days of written notice thereof to the Indemnifying Party (regardless of whether
it is ultimately determined that an Indemnified Party is not entitled to
indemnification hereunder; provided that the Indemnifying Party may require such
Indemnified Party to undertake to reimburse all such fees and expenses to the
extent it is finally judicially determined that such Indemnified Party is not
entitled to indemnification hereunder).

            (d) Contribution. If a claim for indemnification under Section 5(a)
or 5(b) is unavailable to an Indemnified Party (by reason of public policy or
otherwise), then each Indemnifying Party, in lieu of indemnifying such
Indemnified Party, shall contribute to the amount paid or payable by such
Indemnified Party as a result of such Losses, in such proportion as is
appropriate to reflect the relative fault of the Indemnifying Party and
Indemnified Party in connection with the actions, statements or omissions that
resulted in such Losses as well as any other relevant equitable considerations.
The relative fault of such Indemnifying Party and Indemnified Party shall be
determined by reference to, among other things, whether any action in question,
including any untrue or alleged untrue statement of a material fact or omission
or alleged omission of a material fact, has been taken or made by, or relates to
information supplied by, such Indemnifying Party or Indemnified Party, and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such action, statement or omission. The amount paid or
payable by a party as a result of any Losses shall be deemed to include, subject
to the limitations set forth in Section 5(c), any reasonable attorneys' or other
reasonable fees or expenses incurred by such party in connection with any
Proceeding to the extent such party would have been indemnified for such fees or
expenses if the indemnification provided for in this Section was available to
such party in accordance with its terms.

            The parties hereto agree that it would not be just and equitable if
contribution pursuant to this Section 5(d) were determined by pro rata
allocation or by any other method of allocation that does not take into account
the equitable considerations referred to in the immediately preceding paragraph.
Notwithstanding the provisions of this Section 5(d), no Holder shall be required
to contribute, in the aggregate, any amount in excess of the amount by which the
proceeds actually received by such Holder from the sale of the Registrable
Securities subject to the Proceeding exceeds the amount of any damages that such
Holder has otherwise been required to pay by reason of such untrue or alleged
untrue statement or omission or alleged omission. No Person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any Person who was not guilty of such
fraudulent misrepresentation. No party shall be liable for contribution with
respect to any action, suit, proceeding or claim settled without its prior
written consent, which consent shall not be unreasonably withheld.

            The indemnity and contribution agreements contained in this Section
are in addition to any liability that the Indemnifying Parties may have to the
Indemnified Parties.


                                       11

      6. Miscellaneous

            (a) Remedies. In the event of a breach by the Company or by a Holder
of any of their obligations under this Agreement, each Holder or the Company, as
the case may be, in addition to being entitled to exercise all rights granted by
law and under this Agreement, including recovery of damages, will be entitled to
specific performance of its rights under this Agreement. The Company and each
Holder agree that monetary damages would not provide adequate compensation for
any losses incurred by reason of a breach by it of any of the provisions of this
Agreement and hereby further agrees that, in the event of any action for
specific performance in respect of such breach, it shall waive the defense that
a remedy at law would be adequate.

            (b) Amendments and Waivers. The provisions of this Agreement,
including the provisions of this sentence, may not be amended, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may not be given, unless the same shall be in writing and signed by the Company
and the Holders of at least two-thirds of the then outstanding Registrable
Securities. Notwithstanding the foregoing, a waiver or consent to depart from
the provisions hereof with respect to a matter that relates exclusively to the
rights of Holders and that does not directly or indirectly affect the rights of
other Holders may be given by Holders of at least a majority of the Registrable
Securities to which such waiver or consent relates; provided, however, that the
provisions of this sentence may not be amended, modified, or supplemented except
in accordance with the provisions of the immediately preceding sentence.

            (c) Information by Holders. Each Holder included in any registration
pursuant to this Agreement shall furnish to the Company such information
regarding such Holder and the distribution proposed by such Holder (if different
than Annex A) as the Company may reasonably request in writing and that is
required under applicable law in connection with any registration, qualification
or compliance referred to in this Agreement.

            (d) No Inconsistent Agreements. Neither the Company nor any of its
subsidiaries has entered, as of the date hereof, nor shall the Company or any of
its subsidiaries, on or after the date of this Agreement, enter into any
agreement with respect to its securities that would conflict with the provisions
hereof.

            (e) No Piggyback on Registrations. Except as and to the extent
specified in Schedule 3.1(w) to the Purchase Agreement, neither the Company nor
any of its security holders (other than the Holders in such capacity pursuant
hereto) may include securities of the Company in the Registration Statement
other than the Registrable Securities, and the Company shall not after the date
hereof enter into any agreement providing any such right to any of its security
holders.

            (f) Compliance. Each Holder covenants and agrees that it will comply
with the prospectus delivery requirements of the Securities Act as applicable to
it in connection with sales of Registrable Securities pursuant to the
Registration Statement.

            (g) Discontinued Disposition. Each Holder agrees by its acquisition
of such Registrable Securities that, upon receipt of a notice from the Company
of the occurrence of any


                                       12

event of the kind described in Section 3(d)(v), 3(d)(vi), or 3(d)(vii), such
Holder will forthwith discontinue disposition of such Registrable Securities
under the Registration Statement until such Holder's receipt of the copies of
the supplemented Prospectus and/or amended Registration Statement contemplated
by Section 3(k), or until it is advised in writing (the "ADVICE") by the Company
that the use of the applicable Prospectus may be resumed, and, in either case,
has received copies of any additional or supplemental filings that are
incorporated or deemed to be incorporated by reference in such Prospectus or
Registration Statement. The Company may provide appropriate stop orders to
enforce the provisions of this paragraph.

            (h) Piggy-Back Registrations. If at any time during the
Effectiveness Period there is not an effective Registration Statement covering
all of the Registrable Securities and the Company shall determine to prepare and
file with the Commission a registration statement relating to an offering for
its own account or the account of others under the Securities Act of any of its
equity securities, other than on Form S-4 or Form S-8 (each as promulgated under
the Securities Act) or their then equivalents relating to equity securities to
be issued solely in connection with any acquisition of any entity or business or
equity securities issuable in connection with stock option or other employee
benefit plans, then the Company shall send to each Holder written notice of such
determination and, if within fifteen days after receipt of such notice, any such
Holder shall so request in writing, the Company shall include in such
registration statement all or any part of such Registrable Securities such
holder requests to be registered, subject to customary underwriter cutbacks no
less favorable to each Holder than to any other participating stockholder of the
Company, in the event of an underwritten offering. The Company shall have the
right to delay, suspend or withdraw any registration of Registrable Securities
effected pursuant to this Section 6(h) without any obligation or liability to
any Holder.

            (i) Notices. Any and all notices or other communications or
deliveries required or permitted to be provided hereunder shall be in writing
and shall be deemed given and effective on the earliest of (a) the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Section prior to 5:30 p.m. (New
York City time) on a Trading Day, (b) the next Trading Day after the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Agreement on a day that is not a
Trading Day or later than 5:30 p.m. (New York City time) and earlier than 11:59
p.m. (New York City time) on any Trading Day, (c) the Trading Day following the
date of mailing, if sent by U.S. nationally recognized overnight courier
service, or (d) upon actual receipt by the party to whom such notice is required
to be given. The address for such notices and communications shall be as set
forth in the Purchase Agreement.

            (j) Successors and Assigns. This Agreement, together with the other
Transaction Documents, constitutes the entire agreement, and supersedes all
other prior agreements and understandings, both written and oral, among the
parties with respect to the subject matter hereof. This Agreement shall inure to
the benefit of and be binding upon the successors and permitted assigns of each
of the parties and shall inure to the benefit of each Holder. The Company may
not assign its rights or obligations hereunder without the prior written consent
of each Holder. Each Holder may assign its rights and obligations hereunder in
the manner and to the extent permitted under the Purchase Agreement.


                                       13

            (k) Counterparts. This Agreement may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original
and, all of which taken together shall constitute one and the same Agreement. In
the event that any signature is delivered by facsimile transmission, such
signature shall create a valid binding obligation of the party executing (or on
whose behalf such signature is executed) the same with the same force and effect
as if such facsimile signature were the original thereof.

            (l) GOVERNING LAW; VENUE; WAIVER OF JURY TRIAL. THE CORPORATE LAWS
OF THE STATE OF DELAWARE SHALL GOVERN ALL ISSUES CONCERNING THE RELATIVE RIGHTS
OF THE COMPANY AND ITS STOCKHOLDERS. ALL QUESTIONS CONCERNING THE CONSTRUCTION,
VALIDITY, ENFORCEMENT AND INTERPRETATION OF THIS AGREEMENT SHALL BE GOVERNED BY
AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.
EACH PARTY HEREBY IRREVOCABLY SUBMITS TO THE EXCLUSIVE JURISDICTION OF THE STATE
AND FEDERAL COURTS SITTING IN THE CITY OF NEW YORK, BOROUGH OF MANHATTAN, FOR
THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION HEREWITH OR WITH ANY
TRANSACTION CONTEMPLATED HEREBY OR DISCUSSED HEREIN (INCLUDING WITH RESPECT TO
THE ENFORCEMENT OF ANY OF THE TRANSACTION DOCUMENTS), AND HEREBY IRREVOCABLY
WAIVES, AND AGREES NOT TO ASSERT IN ANY SUIT, ACTION OR PROCEEDING, ANY CLAIM
THAT IT IS NOT PERSONALLY SUBJECT TO THE JURISDICTION OF ANY SUCH COURT, THAT
SUCH SUIT, ACTION OR PROCEEDING IS IMPROPER. EACH PARTY HEREBY IRREVOCABLY
WAIVES PERSONAL SERVICE OF PROCESS AND CONSENTS TO PROCESS BEING SERVED IN ANY
SUCH SUIT, ACTION OR PROCEEDING BY MAILING A COPY THEREOF VIA REGISTERED OR
CERTIFIED MAIL OR OVERNIGHT DELIVERY (WITH EVIDENCE OF DELIVERY) TO SUCH PARTY
AT THE ADDRESS IN EFFECT FOR NOTICES TO IT UNDER THIS AGREEMENT AND AGREES THAT
SUCH SERVICE SHALL CONSTITUTE GOOD AND SUFFICIENT SERVICE OF PROCESS AND NOTICE
THEREOF. NOTHING CONTAINED HEREIN SHALL BE DEEMED TO LIMIT IN ANY WAY ANY RIGHT
TO SERVE PROCESS IN ANY MANNER PERMITTED BY LAW. THE COMPANY HEREBY WAIVES ALL
RIGHTS TO A TRIAL BY JURY.

            (m) Cumulative Remedies. The remedies provided herein are cumulative
and not exclusive of any remedies provided by law.

            (n) Severability. If any term, provision, covenant or restriction of
this Agreement is held by a court of competent jurisdiction to be invalid,
illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their reasonable efforts to find and employ an alternative
means to achieve the same or substantially the same result as that contemplated
by such term, provision, covenant or restriction. It is hereby stipulated and
declared to be the intention of the parties that they would have executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.


                                       14

            (o) Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                           SIGNATURE PAGES TO FOLLOW]


                                       15

            IN WITNESS WHEREOF, the parties have executed this Amended and
Restated Registration Rights Agreement as of the date first written above.

                                    ASPEN TECHNOLOGY, INC.


                                    By: /s/ Lisa W. Zappala
                                        ---------------------------------
                                        Lisa W. Zappala
                                        Senior Vice President and
                                        Chief Financial Officer

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                    SIGNATURE PAGES OF PURCHASERS TO FOLLOW]


                                       16

                                    PINE RIDGE FINANCIAL INC.


                                    By: /s/ Miriam Hyman
                                       --------------------------------
                                    Name: Miriam Hyman
                                    Title: Assistant Secretary

                                    Pine Ridge Financial Inc.
                                    c/o Cavallo Capital Corp.
                                    660 Madison Avenue
                                    New York, NY 10022
                                    Facsimile No.: (212) 651-9010
                                    Telephone No.: (212) 651-9000
                                    Attn: Avi Vigder

                                    With a copy to
                                          Proskauer Rose LLP
                                          1585 Broadway
                                          New York, New York 10036-8299
                                          Facsimile No.: (212) 969-2900
                                          Telephone No.: (212) 969-3000
                                          Attn: Adam J. Kansler, Esq.


                                       17

                                    SMITHFIELD FIDUCIARY LLC


                                    By: /s/ Adam J. Chill
                                       -----------------------------------
                                    Name:  Adam J. Chill
                                    Title: Authorized Signatory

                                    Address for Notice:

                                    Smithfield Fiduciary LLC
                                    c/o Highbridge Capital Management, LLC
                                    9 West 57th Street, 27th Floor
                                    New York, New York 10019
                                    Facsimile No.: (212) 751-0755
                                    Telephone No.: (212) 287-4720
                                    Attn: Ari J. Storch / Adam J. Chill

                                    With a copy to
                                          Proskauer Rose LLP
                                          1585 Broadway
                                          New York, New York 10036-8299
                                          Facsimile No.: (212) 969-2900
                                          Telephone No.: (212) 969-3000
                                          Attn: Adam J. Kansler, Esq.


                                       18

                                    PERSEVERANCE LLC


                                    By: /s/ Fiona Theaker
                                       ---------------------------------
                                    Name:  Fiona Theaker
                                    Title: Director

                                    Perseverance LLC.
                                    c/o Cavallo Capital Corp.
                                    660 Madison Avenue
                                    New York, NY 10022
                                    Facsimile No.: (212) 651-9010
                                    Telephone No.: (212) 651-9000
                                    Attn: Avi Vigder

                                    With a copy to
                                          Proskauer Rose LLP
                                          1585 Broadway
                                          New York, New York 10036-8299
                                          Facsimile No.: (212) 969-2900
                                          Telephone No.: (212) 969-3000
                                          Attn: Adam J. Kansler, Esq.



                                       19

                                                                         Annex A

                              PLAN OF DISTRIBUTION

      The selling stockholders may, from time to time, sell any or all of their
shares of common stock on any stock exchange, market or trading facility on
which the shares are traded or in private transactions. These sales may be at
fixed or negotiated prices. The selling stockholders may use any one or more of
the following methods when selling shares:

- -     ordinary brokerage transactions and transactions in which the
      broker-dealer solicits purchasers;

- -     block trades in which the broker-dealer will attempt to sell the shares as
      agent but may position and resell a portion of the block as principal to
      facilitate the transaction;

- -     purchases by a broker-dealer as principal and resale by the broker-dealer
      for its account;

- -     an exchange distribution in accordance with the rules of the applicable
      exchange;

- -     privately negotiated transactions;

- -     short sales;

- -     broker-dealers may agree with the selling stockholders to sell a specified
      number of such shares at a stipulated price per share;

- -     a combination of any such methods of sale; and

- -     any other method permitted pursuant to applicable law.

      The selling stockholders may also sell shares under Rule 144 under the
Securities Act, if available, rather than under this prospectus.

      The selling stockholders may also engage in short sales against the box,
puts and calls and other transactions in our securities or derivatives of our
securities and may sell or deliver shares in connection with these trades.

      Broker-dealers engaged by the selling stockholders may arrange for other
brokers-dealers to participate in sales. Broker-dealers may receive commissions
or discounts from the selling stockholders (or, if any broker-dealer acts as
agent for the purchaser of shares, from the purchaser) in amounts to be
negotiated. The selling stockholders do not expect these commissions and
discounts to exceed what is customary in the types of transactions involved. Any
profits on the resale of shares of common stock by a broker-dealer acting as
principal might be deemed to be underwriting discounts or commissions under the
Securities Act. Discounts, concessions, commissions and similar selling
expenses, if any, attributable to the sale of shares will be borne by a selling
stockholder. The selling stockholders may agree to indemnify any


                                       20

agent, dealer or broker-dealer that participates in transactions involving sales
of the shares if liabilities are imposed on that person under the Securities
Act.

      The selling stockholders may from time to time pledge or grant a security
interest in some or all of the shares of common stock owned by them and, if they
default in the performance of their secured obligations, the pledgees or secured
parties may offer and sell the shares of common stock from time to time under
this prospectus after we have filed an amendment to this prospectus under Rule
424(b)(3) or other applicable provision of the Securities Act of 1933 amending
the list of selling stockholders to include the pledgee, transferee or other
successors in interest as selling stockholders under this prospectus.

      The selling stockholders also may transfer the shares of common stock in
other circumstances, in which case the transferees, pledgees or other successors
in interest will be the selling beneficial owners for purposes of this
prospectus and may sell the shares of common stock from time to time under this
prospectus after we have filed an amendment to this prospectus under Rule
424(b)(3) or other applicable provision of the Securities Act of 1933 amending
the list of selling stockholders to include the pledgee, transferee or other
successors in interest as selling stockholders under this prospectus.

      The selling stockholders and any broker-dealers or agents that are
involved in selling the shares of common stock may be deemed to be
"underwriters" within the meaning of the Securities Act in connection with such
sales. In such event, any commissions received by such broker-dealers or agents
and any profit on the resale of the shares of common stock purchased by them may
be deemed to be underwriting commissions or discounts under the Securities Act.

      We are required to pay certain fees and expenses incident to the
registration of the shares of common stock, including certain fees and
disbursements of counsel to the selling stockholders. We have agreed to
indemnify the selling stockholders against certain losses, claims, damages and
liabilities, including liabilities under the Securities Act.

      The selling stockholders have advised us that they have not entered into
any agreements, understandings or arrangements with any underwriters or
broker-dealers regarding the sale of their shares of common stock, nor is there
an underwriter or coordinating broker acting in connection with a proposed sale
of shares of common stock by any selling stockholder. If we are notified by any
selling stockholder that any material arrangement has been entered into with a
broker-dealer for the sale of shares of common stock, if required, we will file
a supplement to this prospectus. If the selling stockholders use this prospectus
for any sale of the shares of common stock, they will be subject to the
prospectus delivery requirements of the Securities Act.

      The anti-manipulation rules of Regulation M under the Securities Exchange
Act of 1934 may apply to sales of our common stock and activities of the selling
stockholders.


                                       21



                                                                    EXHIBIT 99.3

                        FORM OF WARRANT FOR FIRST CLOSING

THESE SECURITIES HAVE NOT BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE
COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN
EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
"SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT
TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO
AN AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT
AND IN COMPLIANCE WITH APPLICABLE STATE SECURITIES OR BLUE SKY LAWS. THESE
SECURITIES AND THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES MAY BE
PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN SECURED BY
SUCH SECURITIES.

                             ASPEN TECHNOLOGY, INC.

                                     WARRANT

Warrant No. [ ]                                          Dated: February 6, 2002

      Aspen Technology, Inc., a Delaware corporation (the "COMPANY"), hereby
certifies that, for value received, [Name of Holder] or its registered assigns
(the "HOLDER"), is entitled to purchase from the Company up to a total of
[______] shares of common stock, $0.10 par value per share (the "COMMON STOCK"),
of the Company (each such share, a "WARRANT SHARE" and all such shares, the
"WARRANT SHARES") at an exercise price equal to $[ ] per share (as adjusted from
time to time as provided in Section 8, the "EXERCISE PRICE"), at any time and
from time to time from and after the date hereof and through and including
February 6, 2007 (the "EXPIRATION DATE"), and subject to the following terms and
conditions. This Warrant (this "Warrant") is one of a series of similar warrants
issued pursuant to that certain Securities Purchase Agreement, dated as of the
date hereof, by and among the Company and the Purchasers identified therein (the
"PURCHASE AGREEMENT"). All such warrants are referred to herein, collectively,
as the "WARRANTS."

      1. Definitions. In addition to the terms defined elsewhere in this
Warrant, capitalized terms that are not otherwise defined herein have the
meanings given to such terms in the Purchase Agreement.

      2. Registration of Warrant. The Company shall register this Warrant, upon
records to be maintained by the Company for that purpose (the "WARRANT
REGISTER"), in the name of the record Holder hereof from time to time. The
Company may deem and treat the registered Holder

of this Warrant as the absolute owner hereof for the purpose of any exercise
hereof or any distribution to the Holder, and for all other purposes, absent
actual notice to the contrary.

      3. Registration of Transfers. The Company shall register the transfer of
any portion of this Warrant in the Warrant Register, upon surrender of this
Warrant, with the Form of Assignment attached hereto duly completed and signed
by the Holder, to the Transfer Agent or to the Company at its address specified
herein, provided that any such assignment shall be pursuant to a Qualified
Transfer. Upon any such registration or transfer, a new warrant to purchase
Common Stock, in substantially the form of this Warrant (any such new warrant, a
"NEW WARRANT"), evidencing the portion of this Warrant so transferred shall be
issued to the transferee and a New Warrant evidencing the remaining portion of
this Warrant not so transferred, if any, shall be issued to the transferring
Holder. The acceptance of the New Warrant by the transferee thereof shall be
deemed the acceptance by such transferee of all of the rights and obligations of
a holder of a Warrant.

      4. Exercise and Duration of Warrant.

            (a) This Warrant shall be exercisable by the registered Holder at
any time and from time to time on or after the date hereof to and including the
Expiration Date. At 6:30 P.M., New York City time on the Expiration Date, the
portion of this Warrant not exercised prior thereto shall be and become void and
of no value; provided that, if the average of the Closing Prices for the five
Trading Days immediately prior to (but not including) the Expiration Date
exceeds the Exercise Price on the Expiration Date, then this Warrant shall be
deemed to have been exercised in full (to the extent not previously exercised)
on a "cashless exercise" basis at 6:30 P.M. New York City time on the Expiration
Date.

            (b) Except as provided in Section 4(a), a Holder may exercise this
Warrant by delivering to the Company (i) an Exercise Notice, in the form
attached hereto, appropriately completed and duly signed, and (ii) payment of
the Exercise Price for the number of Warrant Shares as to which this Warrant is
being exercised (which may take the form of a "cashless exercise" if so
indicated in the Exercise Notice), and the date such items are delivered to the
Company (as determined in accordance with the notice provisions hereof), or the
Warrant has been deemed to have been exercised pursuant to Section 4(a), is an
"EXERCISE DATE." The Holder shall not be required to deliver the original
Warrant in order to effect an exercise hereunder. Execution and delivery of the
Exercise Notice shall have the same effect as cancellation of the original
Warrant and issuance of a New Warrant evidencing the right to purchase the
remaining number of Warrant Shares.

      5. Delivery of Warrant Shares.

            (a) Upon exercise of this Warrant, the Company shall promptly (but
in no event later than three Trading Days after the Exercise Date) issue or
cause to be issued and cause to be delivered to or upon the written order of the
Holder and in such name or names as the Holder may designate, a certificate for
the Warrant Shares issuable upon such exercise, free of restrictive legends
unless a registration statement covering the resale of the Warrant Shares and
naming the Holder as a selling stockholder thereunder is not then effective and
the Warrant Shares are not freely transferable without volume restrictions
pursuant to Rule 144 under the


                                       2

Securities Act. Notwithstanding the foregoing, if the Warrant is deemed to have
been exercised pursuant to Section 4(a), then the Company shall issue or cause
to be issued a certificate for the Warrant Shares issuable upon such exercise no
later than three Trading Days after the Holder delivers a notice to the Company
in accordance with Section 12 that the Warrant was deemed to have been exercised
pursuant to Section 4(a). The Holder, or any Person so designated by the Holder
to receive Warrant Shares, shall be deemed to have become holder of record of
such Warrant Shares as of the Exercise Date. The Company shall, upon request of
the Holder, use its commercially reasonable best efforts to deliver Warrant
Shares hereunder electronically through the Depository Trust Corporation or
another established clearing corporation performing similar functions.

            (b) This Warrant is exercisable, either in its entirety or, from
time to time, for a portion of the number of Warrant Shares. Upon surrender of
this Warrant following one or more partial exercises, the Company shall issue or
cause to be issued, at its expense, a New Warrant evidencing the right to
purchase the remaining number of Warrant Shares.

            (c) The Company's obligations to issue and deliver Warrant Shares
subject to and in accordance with the terms hereof are absolute and
unconditional, irrespective of any action or inaction by the Holder to enforce
the same, any waiver or consent with respect to any provision hereof, the
recovery of any judgment against any Person or any action to enforce the same,
or any setoff, counterclaim, recoupment, limitation or termination, or any
breach or alleged breach by the Holder or any other Person of any obligation to
the Company or any violation or alleged violation of law by the Holder or any
other Person, and irrespective of any other circumstance which might otherwise
limit such obligation of the Company to the Holder in connection with the
issuance of Warrant Shares.

      6. Charges, Taxes and Expenses. Issuance of certificates for shares of
Common Stock upon exercise of this Warrant shall be made without charge to the
Holder for any issue or transfer tax, withholding tax, transfer agent fee or
other incidental tax or expense in respect of the issuance of such certificates,
all of which taxes and expenses shall be paid by the Company; provided, however,
that the Company shall not be required to pay any tax which may be payable in
respect of any transfer involved in the registration of any certificates for
Warrant Shares or Warrants in a name other than that of the Holder. The Holder
shall be responsible for all other tax liability that may arise as a result of
holding or transferring this Warrant or receiving Warrant Shares upon exercise
hereof.

      7. Reservation of Warrant Shares. The Company covenants that it will at
all times reserve and keep available out of the aggregate of its authorized but
unissued and otherwise unreserved Common Stock, solely for the purpose of
enabling it to issue Warrant Shares upon exercise of this Warrant as herein
provided, 665,854 shares of Common Stock (as adjusted for any stock splits,
stock combinations or similar events), free from preemptive rights or any other
contingent purchase rights of persons other than the Holder (taking into account
the adjustments and restrictions of Section 8), less any shares of Common Stock
issued upon exercise of the Warrants and reductions reasonably agreed to by the
Purchasers to reflect shares of Common Stock issued upon exercise of the
Warrants. The Company covenants that all Warrant Shares so issuable and
deliverable shall, upon issuance and the payment of the applicable Exercise
Price in accordance with the terms hereof, be duly and validly authorized,
issued and fully paid and


                                       3

nonassessable. The Company will take all such action as may be necessary to
assure that such shares of stock may be issued as provided herein without
violation of any applicable law or regulation, or of any requirements of any
securities exchange or automated quotation system upon which the stock may be
listed (it being understood that the Company shall not be required to take any
action to assure the issuance of stock to any Purchaser to the extent that such
issuance is prohibited by some act or failure to act of such Purchaser).

      8. Certain Adjustments. The Exercise Price and number of Warrant Shares
issuable upon exercise of this Warrant are subject to adjustment from time to
time as set forth in this Section 8.

            (a) Stock Dividends and Splits. If the Company, at any time while
this Warrant is outstanding, (i) pays a stock dividend on its Common Stock or
otherwise makes a distribution on any class of capital stock that is payable in
shares of Common Stock, (ii) subdivides outstanding shares of Common Stock into
a larger number of shares, or (iii) combines outstanding shares of Common Stock
into a smaller number of shares, then in each such case the Exercise Price shall
be multiplied by a fraction of which the numerator shall be the number of shares
of Common Stock outstanding immediately before such event and of which the
denominator shall be the number of shares of Common Stock outstanding
immediately after such event. Any adjustment made pursuant to clause (i) of this
paragraph shall become effective immediately after the record date for the
determination of stockholders entitled to receive such dividend or distribution,
and any adjustment pursuant to clause (ii) or (iii) of this paragraph shall
become effective immediately after the effective date of such subdivision or
combination.

            (b) Pro Rata Distributions. If the Company, at any time while this
Warrant is outstanding, distributes to holders of Common Stock (i) evidences of
its indebtedness, (ii) any security (other than a distribution of Common Stock
covered by the preceding paragraph), (iii) rights or warrants to subscribe for
or purchase any security, or (iv) any other asset (in each case, "DISTRIBUTED
PROPERTY"), then in each such case the Exercise Price in effect immediately
prior to the record date fixed for determination of stockholders entitled to
receive such distribution shall be adjusted (effective on such record date) to
equal the product of such Exercise Price times a fraction of which the
denominator shall be the average of the Closing Prices for the last five Trading
Days immediately prior to (but not including) such record date and of which the
numerator shall be such average less the then fair market value of the
Distributed Property distributed in respect of one outstanding share of Common
Stock, as determined by the Company's independent certified public accountants
that regularly examine the financial statements of the Company, or, if such
accountants are unable or unwilling to make such determination for any reason,
then a nationally recognized investment banking firm or accounting firm
designated by the Company (an "APPRAISER"). In such event, the Holder, after
receipt of the determination by the Appraiser, shall have the right to select an
additional appraiser (which shall be a nationally recognized investment banking
firm or accounting firm), in which case such fair market value shall be deemed
to equal the average of the values determined by each of the Appraiser and such
appraiser. As an alternative to the foregoing adjustment to the Exercise Price,
at the request of the Holder delivered before the 90th day after such record
date, the Company, within five Trading Days after such request (or, if later, on
the effective date of such distribution), will place the Distributed Property
that such Holder would have been entitled to receive in respect of the Warrant
Shares for which this Warrant could have been exercised


                                       4

immediately prior to such record date in escrow with an escrow agent selected by
the Company and reasonably acceptable to the Holder. Thereafter, upon exercise
of this Warrant in accordance with Section 4, the Holder shall be entitled to
receive, in addition to the number of Warrant Shares issuable such exercise,
that portion of the escrowed Distributed Property attributable to the number of
Warrant Shares for which the Warrant has been exercised, giving effect to all
applicable adjustments called for pursuant to this Section 8 during such escrow
period.

            (c) Fundamental Transactions. If, at any time while this Warrant is
outstanding, (i) the Company effects any merger or consolidation of the Company
with or into another Person, (ii) the Company effects any sale of all or
substantially all of its assets in one or a series of related transactions,
(iii) any tender offer or exchange offer (whether by the Company or another
Person) is completed pursuant to which holders of Common Stock are permitted to
tender or exchange their shares for other securities, cash or property, or (iv)
the Company effects any reclassification of the Common Stock or any compulsory
share exchange pursuant to which the Common Stock is effectively converted into
or exchanged for other securities, cash or property (in any such case, a
"FUNDAMENTAL TRANSACTION"), then the Holder shall have the right thereafter to
receive, upon exercise of this Warrant, the same amount and kind of securities,
cash or property as it would have been entitled to receive upon the occurrence
of such Fundamental Transaction if it had been, immediately prior to such
Fundamental Transaction, the holder of the number of Warrant Shares then
issuable upon exercise in full of this Warrant (the "ALTERNATE CONSIDERATION").
The aggregate Exercise Price for this Warrant will not be affected by any such
Fundamental Transaction, but the Company shall apportion such aggregate Exercise
Price among the Alternate Consideration in a reasonable manner reflecting the
relative value of any different components of the Alternate Consideration. If
holders of Common Stock are given any choice as to the securities, cash or
property to be received in a Fundamental Transaction, then the Holder shall be
given the same choice as to the Alternate Consideration it receives upon any
exercise of this Warrant following such Fundamental Transaction. At the Holder's
request, any successor to the Company or surviving entity in such Fundamental
Transaction shall issue to the Holder a new warrant consistent with the
foregoing provisions, provided that

                  (i) the covenant set forth in Section 7 relating to the
      reservation of Common Stock shall be replaced with a covenant to the
      effect that sufficient Alternate Consideration shall be reserved for
      issuance upon exercise of the Warrant, and

                  (ii) Sections 8(d) and 10 shall be deleted in their entirety,

and evidencing the Holder's right to purchase the Alternate Consideration for
the aggregate Exercise Price upon exercise thereof. The terms of any agreement
pursuant to which a Fundamental Transaction is effected shall include terms
requiring any such successor or surviving entity to comply with the provisions
of this paragraph (c) and ensuring that the Warrant (or any such replacement
security) will be similarly adjusted upon any subsequent transaction analogous
to a Fundamental Transaction.

            (d) Subsequent Equity Sales.


                                       5

                  (i) If, at any time while this Warrant is outstanding, the
      Company or any Subsidiary issues additional shares of Common Stock or
      rights, warrants, options or other securities or debt convertible,
      exercisable or exchangeable for shares of Common Stock or otherwise
      entitling any Person to acquire shares of Common Stock (collectively,
      "Common Stock Equivalents") at an effective net price to the Company per
      share of Common Stock (the "Effective Price") less than the Exercise Price
      (as adjusted hereunder to such date), then the Exercise Price shall be
      reduced to equal the Effective Price. For purposes of this paragraph, in
      connection with any issuance of any Common Stock Equivalents, (A) the
      maximum number of shares of Common Stock potentially issuable at any time
      upon conversion, exercise or exchange of such Common Stock Equivalents
      (the "Deemed Number") shall be deemed to be outstanding upon issuance of
      such Common Stock Equivalents, (B) the Effective Price applicable to such
      Common Stock shall equal the minimum net dollar value of consideration
      payable to the Company to purchase such Common Stock Equivalents and to
      convert, exercise or exchange them into Common Stock, divided by the
      Deemed Number, and (C) no further adjustment shall be made to the Exercise
      Price upon the actual issuance of Common Stock upon conversion, exercise
      or exchange of such Common Stock Equivalents.

                  (ii) If, at any time while this Warrant is outstanding, the
      Company or any Subsidiary issues Common Stock Equivalents with an
      Effective Price or a number of underlying shares that floats or resets or
      otherwise varies or is subject to adjustment based (directly or
      indirectly) on market prices of the Common Stock (a "Floating Price
      Security"), then for purposes of applying the preceding paragraph in
      connection with any subsequent exercise, the Effective Price will be
      determined separately on each Exercise Date and will be deemed to equal
      the lowest Effective Price at which any holder of such Floating Price
      Security is entitled to acquire Common Stock on such Exercise Date
      (regardless of whether any such holder actually acquires any shares on
      such date).

                  (iii) Notwithstanding the foregoing, no adjustment will be
      made under this paragraph (d) in respect of any Excluded Stock.

            (e) Number of Warrant Shares. Simultaneously with any adjustment to
      the Exercise Price pursuant to paragraphs (a), (b) or (d) of this Section,
      the number of Warrant Shares that may be purchased upon exercise of this
      Warrant shall be increased or decreased proportionately, so that after
      such adjustment the aggregate Exercise Price payable hereunder for the
      increased or decreased number of Warrant Shares shall be the same as the
      aggregate Exercise Price in effect immediately prior to such adjustment.

            (f) Calculations. All calculations under this Section 8 shall be
made to the nearest cent or the nearest 1/100th of a share, as applicable. The
number of shares of Common Stock outstanding at any given time shall not include
shares owned or held by or for the account of the Company, and the disposition
of any such shares shall be considered an issue or sale of Common Stock.

            (g) Notice of Adjustments. Upon the occurrence of each adjustment
pursuant to this Section 8, the Company at its expense will promptly compute
such adjustment in accordance with the terms of this Warrant and prepare a
certificate setting forth such adjustment,


                                       6

including a statement of the adjusted Exercise Price and adjusted number or type
of Warrant Shares or other securities issuable upon exercise of this Warrant (as
applicable), describing the transactions giving rise to such adjustments and
showing in detail the facts upon which such adjustment is based. Upon written
request, the Company will promptly deliver a copy of each such certificate to
the Holder and to the Company's Transfer Agent.

            (h) Notice of Corporate Events. If the Company (i) declares a
dividend or any other distribution of cash, securities or other property in
respect of its Common Stock, including without limitation any granting of rights
or warrants to subscribe for or purchase any capital stock of the Company or any
Subsidiary, (ii) authorizes or approves, enters into any agreement contemplating
or solicits stockholder approval for any Fundamental Transaction or (iii)
authorizes the voluntary dissolution, liquidation or winding up of the affairs
of the Company, then the Company shall deliver to the Holder a notice describing
the material terms and conditions of such transaction, at least 20 calendar days
prior to the applicable record or effective date on which a Person would need to
hold Common Stock in order to participate in or vote with respect to such
transaction, and the Company will take all steps reasonably necessary in order
to insure that the Holder is given the practical opportunity to exercise this
Warrant prior to such time so as to participate in or vote with respect to such
transaction; provided, however, that the failure to deliver such notice or any
defect therein shall not affect the validity of the corporate action required to
be described in such notice.

      9. Payment of Exercise Price. The Holder shall pay the Exercise Price in
one of the following manners:

            (a) Cash Exercise. The Holder may deliver immediately available
funds; or

            (b) Cashless Exercise. The Holder may satisfy its obligation to pay
the Exercise Price through a "cashless exercise," in which event the Company
shall issue to the Holder the number of Warrant Shares determined as follows:

                           X = Y [(A-B)/A]
             where:

                           X = the number of Warrant Shares to be issued to the
                           Holder.

                           Y = the number of Warrant Shares with respect to
                           which this Warrant is being exercised.

                           A = the average of the Closing Prices for the five
                           Trading Days immediately prior to (but not including)
                           the Exercise Date.

                           B = the Exercise Price.

For purposes of Rule 144 promulgated under the Securities Act, it is intended,
understood and acknowledged that the Warrant Shares issued in a cashless
exercise transaction shall be deemed to have been acquired by the Holder, and
the holding period for the Warrant Shares shall be


                                       7

deemed to have commenced, on the date this Warrant was originally issued
pursuant to the Purchase Agreement.

      10. Limitation on Exercise.

            (a) Notwithstanding anything to the contrary contained herein, the
number of shares of Common Stock that may be acquired by the Holder upon any
exercise of this Warrant (or otherwise in respect hereof) shall be limited to
the extent necessary to insure that, following such exercise (or other
issuance), the total number of shares of Common Stock then beneficially owned by
such Holder and its Affiliates and any other Persons whose beneficial ownership
of Common Stock would be aggregated with the Holder's for purposes of Section
13(d) of the Exchange Act, does not exceed 4.999% (the "MAXIMUM PERCENTAGE") of
the total number of issued and outstanding shares of Common Stock (including for
such purpose the shares of Common Stock issuable upon such exercise). For such
purposes, beneficial ownership shall be determined in accordance with Section
13(d) of the Exchange Act and the rules and regulations promulgated thereunder.
Each delivery of an Exercise Notice hereunder will constitute a representation
by the Holder that it has evaluated the limitation set forth in this paragraph
and determined that issuance of the full number of Warrant Shares requested in
such Exercise Notice is permitted under this paragraph. The Company's obligation
to issue shares of Common Stock in excess of the limitation referred to in this
Section shall be suspended (and shall not terminate or expire notwithstanding
any contrary provisions hereof) until such time, if any, as such shares of
Common Stock may be issued in compliance with such limitation. By written notice
to the Company, the Holder may waive the provisions of this Section or increase
or decrease the Maximum Percentage to any other percentage specified in such
notice, but (i) any such waiver or increase will not be effective until the 61st
day after such notice is delivered to the Company, and (ii) any such waiver or
increase or decrease will apply only to the Holder and not to any other holder
of Warrants.

            (b) Notwithstanding anything to the contrary contained herein, if
the Trading Market is the Nasdaq National Market or the Nasdaq SmallCap Market
or any other market or exchange with similar applicable rules, then the maximum
number of shares of Common Stock that the Company may issue pursuant to the
Transaction Documents at an effective purchase price less than the Closing Price
on the Trading Day immediately preceding the Closing Date equals 5,825,000
shares (as adjusted for stock splits, stock combinations or similar events) (the
"ISSUABLE MAXIMUM"), unless the Company obtains shareholder approval in
accordance with the rules and regulations of such Trading Market. If, at the
time any Purchaser requests an exercise of any of the Warrants, the Actual
Minimum (excluding any shares issued or issuable at an effective purchase price
in excess of the Closing Price on the Trading Day immediately preceding the
Closing Date) exceeds the Issuable Maximum (and if the Company has not
previously obtained the required shareholder approval), then the Company shall
issue to the Purchaser requesting such exercise a number of shares of Common
Stock not exceeding such Purchaser's pro-rata portion of the Issuable Maximum
(based on such Purchaser's share (vis-a-vis other Purchasers) of the aggregate
purchase price paid under the Purchase Agreement and taking into account any
Warrant Shares previously issued to such Purchaser), and the remainder of the
Warrant Shares issuable in connection with such exercise or conversion (if any)
shall constitute "Excess Shares" pursuant to Section 10(c) below.


                                       8

            (c) In the event that any Purchaser's receipt of shares of Common
Stock upon restricted based on the Issuable Maximum, the Company shall either:
(i) use its best efforts to obtain the required shareholder approval necessary
to permit the issuance of such Excess Shares as soon as is reasonably possible,
but in any event not later than the 60th day after the event giving rise to such
Excess Shares, or (ii) within five Trading Days after such event, pay cash to
such Purchaser, as liquidated damages and not as a penalty, in an amount equal
to the difference between the Black-Scholes value of this Warrant assuming the
limitations in Section 10(b) were not applicable and the Black-Scholes value of
this Warrant after giving effect to the limitations in Section 10(b), measured
as of the date of such event or, if greater, the date of payment (such
difference, the "Cash Amount"). For the purposes of this Section 10(c) the
Black-Scholes value of this Warrant shall be calculated in a manner consistent
with the manner in which the Company performs Black-Scholes calculations to
determine the fair value of option grants for the purposes of the financial
statements contained in its SEC Reports. If the Company elects the first option
under the preceding sentence and the Company fails to obtain the required
shareholder approval on or prior to the 60th day after such event, then within
three Trading Days after such 60th day, the Company shall pay the Cash Amount to
such Purchaser, as liquidated damages and not as a penalty.

      11. Fractional Shares. The Company shall not be required to issue or cause
to be issued fractional Warrant Shares on the exercise of this Warrant. If any
fraction of a Warrant Share would, except for the provisions of this Section, be
issuable upon exercise of this Warrant, the number of Warrant Shares to be
issued will be rounded up to the nearest whole share.

      12. Notices. Any and all notices or other communications or deliveries
hereunder (including without limitation any Exercise Notice) shall be in writing
and shall be deemed given and effective on the earliest of (i) the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile number specified in this Section prior to 6:30 p.m. (New York City
time) on a Trading Day, (ii) the next Trading Day after the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile number specified in this Section on a day that is not a Trading Day or
later than 6:30 p.m. (New York City time) on any Trading Day, (iii) the Trading
Day following the date of mailing, if sent by nationally recognized overnight
courier service, or (iv) upon actual receipt by the party to whom such notice is
required to be given. The address for such notices or communications shall be as
set forth in the Purchase Agreement.

      13. Warrant Agent. The Company shall serve as warrant agent under this
Warrant. Upon 30 days' notice to the Holder, the Company may appoint a new
warrant agent. Any corporation into which the Company or any new warrant agent
may be merged or any corporation resulting from any consolidation to which the
Company or any new warrant agent shall be a party or any corporation to which
the Company or any new warrant agent transfers substantially all of its
corporate trust or shareholders services business shall be a successor warrant
agent under this Warrant without any further act. Any such successor warrant
agent shall promptly cause notice of its succession as warrant agent to be
mailed (by first class mail, postage prepaid) to the Holder at the Holder's last
address as shown on the Warrant Register.

      14. Loss, Theft or Destruction of Warrant. In the event that the Holder
notifies the Company that this Warrant has been lost, stolen or destroyed, then
a replacement Warrant,


                                       9

identical in all respects to the original Warrant (except for any registration
number and any adjustment pursuant hereto to the Exercise Price or number of
Warrant Shares issuable hereunder, if different that the numbers shown on the
original Warrant) shall be delivered to the Holder by the Company, provided that
such Holder executes and delivers to the Company an agreement reasonably
satisfactory to the Company to indemnify the Company from any loss incurred by
the Company in connection with such Warrant.

      15. No Rights as Stockholder until Exercise. Subject to Section 8 of this
Warrant and the provisions of any other Transaction Documents, prior to the
exercise of this Warrant as provided herein, the Holder shall not be entitled to
vote or receive dividends or be deemed the holder of Warrant Shares or any other
securities of the Company that may at any time be issuable on the exercise
hereof for any purpose, nor shall anything contained herein be construed to
confer upon the Holder, as such, any of the rights of a stockholder of the
Company or any right to vote for the election of directors or upon any matter
submitted to the stockholders at any meeting thereof, or to give or withhold
consent to any corporate action or to receive notice of meetings, or to receive
dividend or subscription rights.

      16. Miscellaneous.

            (a) This Warrant shall be binding on and inure to the benefit of the
parties hereto and their respective successors and assigns. Subject to the
preceding sentence, nothing in this Warrant shall be construed to give to any
Person other than the Company and the Holder any legal or equitable right,
remedy or cause of action under this Warrant. This Warrant may be amended only
in writing signed by the Company and the Holder and their successors and
assigns.

            (b) The Company will not, by amendment of its governing documents or
through any reorganization, transfer of assets, consolidation, merger,
dissolution, issue or sale of securities or any other voluntary action, avoid or
seek to avoid the observance or performance of any of the terms of this Warrant,
but will at all times in good faith assist in the carrying out of all such terms
and in the taking of all such action as may be necessary or appropriate in order
to protect the rights of the Holder against impairment. Without limiting the
generality of the foregoing, the Company (i) will not increase the par value of
any Warrant Shares above the amount payable therefor on such exercise, (ii) will
take all such action as may be reasonably necessary or appropriate in order that
the Company may validly and legally issue fully paid and nonassessable Warrant
Shares on the exercise of this Warrant, and (iii) will not close its shareholder
books or records in any manner which interferes with the timely exercise of this
Warrant.

            (c) GOVERNING LAW; VENUE; WAIVER OF JURY TRIAL. THE CORPORATE LAWS
OF THE STATE OF DELAWARE SHALL GOVERN ALL ISSUES CONCERNING THE RELATIVE RIGHTS
OF THE COMPANY AND ITS STOCKHOLDERS. ALL QUESTIONS CONCERNING THE CONSTRUCTION,
VALIDITY, ENFORCEMENT AND INTERPRETATION OF THIS WARRANT SHALL BE GOVERNED BY
AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.
EACH PARTY HEREBY IRREVOCABLY SUBMITS TO THE EXCLUSIVE JURISDICTION OF THE STATE
AND FEDERAL COURTS SITTING IN THE CITY OF NEW YORK, BOROUGH OF MANHATTAN, FOR
THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION HEREWITH OR WITH ANY


                                       10

TRANSACTION CONTEMPLATED HEREBY OR DISCUSSED HEREIN (INCLUDING WITH RESPECT TO
THE ENFORCEMENT OF ANY OF THE TRANSACTION DOCUMENTS), AND HEREBY IRREVOCABLY
WAIVES, AND AGREES NOT TO ASSERT IN ANY SUIT, ACTION OR PROCEEDING, ANY CLAIM
THAT IT IS NOT PERSONALLY SUBJECT TO THE JURISDICTION OF ANY SUCH COURT, THAT
SUCH SUIT, ACTION OR PROCEEDING IS IMPROPER. EACH PARTY HEREBY IRREVOCABLY
WAIVES PERSONAL SERVICE OF PROCESS AND CONSENTS TO PROCESS BEING SERVED IN ANY
SUCH SUIT, ACTION OR PROCEEDING BY MAILING A COPY THEREOF VIA REGISTERED OR
CERTIFIED MAIL OR OVERNIGHT DELIVERY (WITH EVIDENCE OF DELIVERY) TO SUCH PARTY
AT THE ADDRESS IN EFFECT FOR NOTICES TO IT UNDER THIS AGREEMENT AND AGREES THAT
SUCH SERVICE SHALL CONSTITUTE GOOD AND SUFFICIENT SERVICE OF PROCESS AND NOTICE
THEREOF. NOTHING CONTAINED HEREIN SHALL BE DEEMED TO LIMIT IN ANY WAY ANY RIGHT
TO SERVE PROCESS IN ANY MANNER PERMITTED BY LAW. THE COMPANY HEREBY WAIVES ALL
RIGHTS TO A TRIAL BY JURY.

            (d) The headings herein are for convenience only, do not constitute
a part of this Warrant and shall not be deemed to limit or affect any of the
provisions hereof.

            (e) In case any one or more of the provisions of this Warrant shall
be invalid or unenforceable in any respect, the validity and enforceability of
the remaining terms and provisions of this Warrant shall not in any way be
affected or impaired thereby and the parties will attempt in good faith to agree
upon a valid and enforceable provision which shall be a commercially reasonable
substitute therefor, and upon so agreeing, shall incorporate such substitute
provision in this Warrant.


                                       11

      IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed by its authorized officer as of the date first indicated above.

                                            ASPEN TECHNOLOGY, INC.


                                            By:______________________________
                                            Name:____________________________
                                            Title:___________________________


                                       12

FORM OF EXERCISE NOTICE

(To be executed by the Holder to exercise the right to purchase shares of Common
Stock under the foregoing Warrant)

To: Aspen Technology, Inc.

The undersigned is the Holder of Warrant No. _______ (the "WARRANT") issued by
Aspen Technology, Inc., a Delaware corporation (the "COMPANY"). Capitalized
terms used herein and not otherwise defined have the respective meanings set
forth in the Warrant.

1.    The Warrant is currently exercisable to purchase a total of ______________
      Warrant Shares.

2.    The undersigned Holder hereby exercises its right to purchase
      _________________ Warrant Shares pursuant to the Warrant.

3.    The Holder intends that payment of the Exercise Price shall be made as
      (check one):

                  ____ "Cash Exercise" under Section 9(a)

                  ____ "Cashless Exercise" under Section 9(b)

4.    If the holder has elected a Cash Exercise, the holder shall pay the sum of
      $____________ to the Company in accordance with the terms of the Warrant.

5.    Pursuant to this exercise, the Company shall deliver to the holder
      _______________ Warrant Shares in accordance with the terms of the
      Warrant.

6.    Following this exercise, the Warrant shall be exercisable to purchase a
      total of ______________ Warrant Shares.

Dated: _______________,_________            Name of Holder:

                                            (Print)_____________________________

                                            By: ________________________________
                                            Name:_______________________________
                                            Title:______________________________

                                             (Signature must conform in all
                                             respects to name of holder as
                                             specified on the face of the
                                             Warrant)

                               FORM OF ASSIGNMENT

           [To be completed and signed only upon transfer of Warrant]

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto ________________________________ the right represented by the within
Warrant to purchase ____________ shares of Common Stock of Aspen Technology,
Inc. to which the within Warrant relates and appoints ________________ attorney
to transfer said right on the books of Aspen Technology, Inc. with full power of
substitution in the premises.

Dated: _______________,_________


                                        ________________________________________
                                        (Signature must conform in all respects
                                        to name of holder as specified on the
                                        face of the Warrant)

                                        ________________________________________
                                        Address of Transferee

                                        ________________________________________

                                        ________________________________________

In the presence of:

___________________________



                                                                    EXHIBIT 99.4


                       FORM OF WARRANT FOR SECOND CLOSING

THESE SECURITIES HAVE NOT BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE
COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN
EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
"SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT
TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO
AN AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT
AND IN COMPLIANCE WITH APPLICABLE STATE SECURITIES OR BLUE SKY LAWS. THESE
SECURITIES AND THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES MAY BE
PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN SECURED BY
SUCH SECURITIES.

                             ASPEN TECHNOLOGY, INC.

                                     WARRANT

Warrant No. [  ]                                      Dated:  February 28, 2002

      Aspen Technology, Inc., a Delaware corporation (the "COMPANY"), hereby
certifies that, for value received, [Name of Holder] or its registered assigns
(the "HOLDER"), is entitled to purchase from the Company up to a total of
[______] shares of common stock, $0.10 par value per share (the "COMMON STOCK"),
of the Company (each such share, a "WARRANT SHARE" and all such shares, the
"WARRANT SHARES") at an exercise price equal to $[ ] per share (as adjusted from
time to time as provided in Section 8, the "EXERCISE PRICE"), at any time and
from time to time from and after the date hereof and through and including
February 28, 2007 (the "EXPIRATION DATE"), and subject to the following terms
and conditions. This Warrant (this "Warrant") is one of a series of similar
warrants issued pursuant to that certain Securities Purchase Agreement, dated as
of the date hereof, by and among the Company and the Purchasers identified
therein (the "PURCHASE AGREEMENT"). All such warrants are referred to herein,
collectively, as the "WARRANTS."

      1. Definitions. In addition to the terms defined elsewhere in this
Warrant, capitalized terms that are not otherwise defined herein have the
meanings given to such terms in the Purchase Agreement.

      2. Registration of Warrant. The Company shall register this Warrant, upon
records to be maintained by the Company for that purpose (the "WARRANT
REGISTER"), in the name of the record Holder hereof from time to time. The
Company may deem and treat the registered Holder

of this Warrant as the absolute owner hereof for the purpose of any exercise
hereof or any distribution to the Holder, and for all other purposes, absent
actual notice to the contrary.

      3. Registration of Transfers. The Company shall register the transfer of
any portion of this Warrant in the Warrant Register, upon surrender of this
Warrant, with the Form of Assignment attached hereto duly completed and signed
by the Holder, to the Transfer Agent or to the Company at its address specified
herein, provided that any such assignment shall be pursuant to a Qualified
Transfer. Upon any such registration or transfer, a new warrant to purchase
Common Stock, in substantially the form of this Warrant (any such new warrant, a
"NEW WARRANT"), evidencing the portion of this Warrant so transferred shall be
issued to the transferee and a New Warrant evidencing the remaining portion of
this Warrant not so transferred, if any, shall be issued to the transferring
Holder. The acceptance of the New Warrant by the transferee thereof shall be
deemed the acceptance by such transferee of all of the rights and obligations of
a holder of a Warrant.

      4. Exercise and Duration of Warrant.

            (a) This Warrant shall be exercisable by the registered Holder at
any time and from time to time on or after the date hereof to and including the
Expiration Date. At 6:30 P.M., New York City time on the Expiration Date, the
portion of this Warrant not exercised prior thereto shall be and become void and
of no value; provided that, if the average of the Closing Prices for the five
Trading Days immediately prior to (but not including) the Expiration Date
exceeds the Exercise Price on the Expiration Date, then this Warrant shall be
deemed to have been exercised in full (to the extent not previously exercised)
on a "cashless exercise" basis at 6:30 P.M. New York City time on the Expiration
Date.

            (b) Except as provided in Section 4(a), a Holder may exercise this
Warrant by delivering to the Company (i) an Exercise Notice, in the form
attached hereto, appropriately completed and duly signed, and (ii) payment of
the Exercise Price for the number of Warrant Shares as to which this Warrant is
being exercised (which may take the form of a "cashless exercise" if so
indicated in the Exercise Notice), and the date such items are delivered to the
Company (as determined in accordance with the notice provisions hereof), or the
Warrant has been deemed to have been exercised pursuant to Section 4(a), is an
"EXERCISE DATE." The Holder shall not be required to deliver the original
Warrant in order to effect an exercise hereunder. Execution and delivery of the
Exercise Notice shall have the same effect as cancellation of the original
Warrant and issuance of a New Warrant evidencing the right to purchase the
remaining number of Warrant Shares.

      5. Delivery of Warrant Shares.

            (a) Upon exercise of this Warrant, the Company shall promptly (but
in no event later than three Trading Days after the Exercise Date) issue or
cause to be issued and cause to be delivered to or upon the written order of the
Holder and in such name or names as the Holder may designate, a certificate for
the Warrant Shares issuable upon such exercise, free of restrictive legends
unless a registration statement covering the resale of the Warrant Shares and
naming the Holder as a selling stockholder thereunder is not then effective and
the Warrant Shares are not freely transferable without volume restrictions
pursuant to Rule 144 under the


                                       2

Securities Act. Notwithstanding the foregoing, if the Warrant is deemed to have
been exercised pursuant to Section 4(a), then the Company shall issue or cause
to be issued a certificate for the Warrant Shares issuable upon such exercise no
later than three Trading Days after the Holder delivers a notice to the Company
in accordance with Section 12 that the Warrant was deemed to have been exercised
pursuant to Section 4(a). The Holder, or any Person so designated by the Holder
to receive Warrant Shares, shall be deemed to have become holder of record of
such Warrant Shares as of the Exercise Date. The Company shall, upon request of
the Holder, use its commercially reasonable best efforts to deliver Warrant
Shares hereunder electronically through the Depository Trust Corporation or
another established clearing corporation performing similar functions.

            (b) This Warrant is exercisable, either in its entirety or, from
time to time, for a portion of the number of Warrant Shares. Upon surrender of
this Warrant following one or more partial exercises, the Company shall issue or
cause to be issued, at its expense, a New Warrant evidencing the right to
purchase the remaining number of Warrant Shares.

            (c) The Company's obligations to issue and deliver Warrant Shares
subject to and in accordance with the terms hereof are absolute and
unconditional, irrespective of any action or inaction by the Holder to enforce
the same, any waiver or consent with respect to any provision hereof, the
recovery of any judgment against any Person or any action to enforce the same,
or any setoff, counterclaim, recoupment, limitation or termination, or any
breach or alleged breach by the Holder or any other Person of any obligation to
the Company or any violation or alleged violation of law by the Holder or any
other Person, and irrespective of any other circumstance which might otherwise
limit such obligation of the Company to the Holder in connection with the
issuance of Warrant Shares.

      6. Charges, Taxes and Expenses. Issuance of certificates for shares of
Common Stock upon exercise of this Warrant shall be made without charge to the
Holder for any issue or transfer tax, withholding tax, transfer agent fee or
other incidental tax or expense in respect of the issuance of such certificates,
all of which taxes and expenses shall be paid by the Company; provided, however,
that the Company shall not be required to pay any tax which may be payable in
respect of any transfer involved in the registration of any certificates for
Warrant Shares or Warrants in a name other than that of the Holder. The Holder
shall be responsible for all other tax liability that may arise as a result of
holding or transferring this Warrant or receiving Warrant Shares upon exercise
hereof.

      7. Reservation of Warrant Shares. The Company covenants that it will at
all times reserve and keep available out of the aggregate of its authorized but
unissued and otherwise unreserved Common Stock, solely for the purpose of
enabling it to issue Warrant Shares upon exercise of this Warrant as herein
provided, 665,854 shares of Common Stock (as adjusted for any stock splits,
stock combinations or similar events), free from preemptive rights or any other
contingent purchase rights of persons other than the Holder (taking into account
the adjustments and restrictions of Section 8), less any shares of Common Stock
issued upon exercise of the Warrants and reductions reasonably agreed to by the
Purchasers to reflect shares of Common Stock issued upon exercise of the
Warrants. The Company covenants that all Warrant Shares so issuable and
deliverable shall, upon issuance and the payment of the applicable Exercise
Price in accordance with the terms hereof, be duly and validly authorized,
issued and fully paid and


                                       3

nonassessable. The Company will take all such action as may be necessary to
assure that such shares of stock may be issued as provided herein without
violation of any applicable law or regulation, or of any requirements of any
securities exchange or automated quotation system upon which the stock may be
listed (it being understood that the Company shall not be required to take any
action to assure the issuance of stock to any Purchaser to the extent that such
issuance is prohibited by some act or failure to act of such Purchaser).

      8. Certain Adjustments. The Exercise Price and number of Warrant Shares
issuable upon exercise of this Warrant are subject to adjustment from time to
time as set forth in this Section 8.

            (a) Stock Dividends and Splits. If the Company, at any time while
this Warrant is outstanding, (i) pays a stock dividend on its Common Stock or
otherwise makes a distribution on any class of capital stock that is payable in
shares of Common Stock, (ii) subdivides outstanding shares of Common Stock into
a larger number of shares, or (iii) combines outstanding shares of Common Stock
into a smaller number of shares, then in each such case the Exercise Price shall
be multiplied by a fraction of which the numerator shall be the number of shares
of Common Stock outstanding immediately before such event and of which the
denominator shall be the number of shares of Common Stock outstanding
immediately after such event. Any adjustment made pursuant to clause (i) of this
paragraph shall become effective immediately after the record date for the
determination of stockholders entitled to receive such dividend or distribution,
and any adjustment pursuant to clause (ii) or (iii) of this paragraph shall
become effective immediately after the effective date of such subdivision or
combination.

            (b) Pro Rata Distributions. If the Company, at any time while this
Warrant is outstanding, distributes to holders of Common Stock (i) evidences of
its indebtedness, (ii) any security (other than a distribution of Common Stock
covered by the preceding paragraph), (iii) rights or warrants to subscribe for
or purchase any security, or (iv) any other asset (in each case, "DISTRIBUTED
PROPERTY"), then in each such case the Exercise Price in effect immediately
prior to the record date fixed for determination of stockholders entitled to
receive such distribution shall be adjusted (effective on such record date) to
equal the product of such Exercise Price times a fraction of which the
denominator shall be the average of the Closing Prices for the last five Trading
Days immediately prior to (but not including) such record date and of which the
numerator shall be such average less the then fair market value of the
Distributed Property distributed in respect of one outstanding share of Common
Stock, as determined by the Company's independent certified public accountants
that regularly examine the financial statements of the Company, or, if such
accountants are unable or unwilling to make such determination for any reason,
then a nationally recognized investment banking firm or accounting firm
designated by the Company (an "APPRAISER"). In such event, the Holder, after
receipt of the determination by the Appraiser, shall have the right to select an
additional appraiser (which shall be a nationally recognized investment banking
firm or accounting firm), in which case such fair market value shall be deemed
to equal the average of the values determined by each of the Appraiser and such
appraiser. As an alternative to the foregoing adjustment to the Exercise Price,
at the request of the Holder delivered before the 90th day after such record
date, the Company, within five Trading Days after such request (or, if later, on
the effective date of such distribution), will place the Distributed Property
that such Holder would have been entitled to receive in respect of the Warrant
Shares for which this Warrant could have been exercised


                                       4

immediately prior to such record date in escrow with an escrow agent selected by
the Company and reasonably acceptable to the Holder. Thereafter, upon exercise
of this Warrant in accordance with Section 4, the Holder shall be entitled to
receive, in addition to the number of Warrant Shares issuable such exercise,
that portion of the escrowed Distributed Property attributable to the number of
Warrant Shares for which the Warrant has been exercised, giving effect to all
applicable adjustments called for pursuant to this Section 8 during such escrow
period.

            (c) Fundamental Transactions. If, at any time while this Warrant is
outstanding, (i) the Company effects any merger or consolidation of the Company
with or into another Person, (ii) the Company effects any sale of all or
substantially all of its assets in one or a series of related transactions,
(iii) any tender offer or exchange offer (whether by the Company or another
Person) is completed pursuant to which holders of Common Stock are permitted to
tender or exchange their shares for other securities, cash or property, or (iv)
the Company effects any reclassification of the Common Stock or any compulsory
share exchange pursuant to which the Common Stock is effectively converted into
or exchanged for other securities, cash or property (in any such case, a
"FUNDAMENTAL TRANSACTION"), then the Holder shall have the right thereafter to
receive, upon exercise of this Warrant, the same amount and kind of securities,
cash or property as it would have been entitled to receive upon the occurrence
of such Fundamental Transaction if it had been, immediately prior to such
Fundamental Transaction, the holder of the number of Warrant Shares then
issuable upon exercise in full of this Warrant (the "ALTERNATE CONSIDERATION").
The aggregate Exercise Price for this Warrant will not be affected by any such
Fundamental Transaction, but the Company shall apportion such aggregate Exercise
Price among the Alternate Consideration in a reasonable manner reflecting the
relative value of any different components of the Alternate Consideration. If
holders of Common Stock are given any choice as to the securities, cash or
property to be received in a Fundamental Transaction, then the Holder shall be
given the same choice as to the Alternate Consideration it receives upon any
exercise of this Warrant following such Fundamental Transaction. At the Holder's
request, any successor to the Company or surviving entity in such Fundamental
Transaction shall issue to the Holder a new warrant consistent with the
foregoing provisions, provided that

                  (i) the covenant set forth in Section 7 relating to the
      reservation of Common Stock shall be replaced with a covenant to the
      effect that sufficient Alternate Consideration shall be reserved for
      issuance upon exercise of the Warrant, and

                  (ii) Sections 8(d) and 10 shall be deleted in their entirety,

and evidencing the Holder's right to purchase the Alternate Consideration for
the aggregate Exercise Price upon exercise thereof. The terms of any agreement
pursuant to which a Fundamental Transaction is effected shall include terms
requiring any such successor or surviving entity to comply with the provisions
of this paragraph (c) and ensuring that the Warrant (or any such replacement
security) will be similarly adjusted upon any subsequent transaction analogous
to a Fundamental Transaction.

            (d) Subsequent Equity Sales.


                                       5

                  (i) If, at any time while this Warrant is outstanding, the
      Company or any Subsidiary issues additional shares of Common Stock or
      rights, warrants, options or other securities or debt convertible,
      exercisable or exchangeable for shares of Common Stock or otherwise
      entitling any Person to acquire shares of Common Stock (collectively,
      "Common Stock Equivalents") at an effective net price to the Company per
      share of Common Stock (the "Effective Price") less than the Exercise Price
      (as adjusted hereunder to such date), then the Exercise Price shall be
      reduced to equal the Effective Price. For purposes of this paragraph, in
      connection with any issuance of any Common Stock Equivalents, (A) the
      maximum number of shares of Common Stock potentially issuable at any time
      upon conversion, exercise or exchange of such Common Stock Equivalents
      (the "Deemed Number") shall be deemed to be outstanding upon issuance of
      such Common Stock Equivalents, (B) the Effective Price applicable to such
      Common Stock shall equal the minimum net dollar value of consideration
      payable to the Company to purchase such Common Stock Equivalents and to
      convert, exercise or exchange them into Common Stock, divided by the
      Deemed Number, and (C) no further adjustment shall be made to the Exercise
      Price upon the actual issuance of Common Stock upon conversion, exercise
      or exchange of such Common Stock Equivalents.

                  (ii) If, at any time while this Warrant is outstanding, the
      Company or any Subsidiary issues Common Stock Equivalents with an
      Effective Price or a number of underlying shares that floats or resets or
      otherwise varies or is subject to adjustment based (directly or
      indirectly) on market prices of the Common Stock (a "Floating Price
      Security"), then for purposes of applying the preceding paragraph in
      connection with any subsequent exercise, the Effective Price will be
      determined separately on each Exercise Date and will be deemed to equal
      the lowest Effective Price at which any holder of such Floating Price
      Security is entitled to acquire Common Stock on such Exercise Date
      (regardless of whether any such holder actually acquires any shares on
      such date).

                  (iii) Notwithstanding the foregoing, no adjustment will be
      made under this paragraph (d) in respect of any Excluded Stock.

            (e) Number of Warrant Shares. Simultaneously with any adjustment to
the Exercise Price pursuant to paragraphs (a), (b) or (d) of this Section, the
number of Warrant Shares that may be purchased upon exercise of this Warrant
shall be increased or decreased proportionately, so that after such adjustment
the aggregate Exercise Price payable hereunder for the increased or decreased
number of Warrant Shares shall be the same as the aggregate Exercise Price in
effect immediately prior to such adjustment.

            (f) Calculations. All calculations under this Section 8 shall be
made to the nearest cent or the nearest 1/100th of a share, as applicable. The
number of shares of Common Stock outstanding at any given time shall not include
shares owned or held by or for the account of the Company, and the disposition
of any such shares shall be considered an issue or sale of Common Stock.

            (g) Notice of Adjustments. Upon the occurrence of each adjustment
pursuant to this Section 8, the Company at its expense will promptly compute
such adjustment in accordance with the terms of this Warrant and prepare a
certificate setting forth such adjustment,


                                       6

including a statement of the adjusted Exercise Price and adjusted number or type
of Warrant Shares or other securities issuable upon exercise of this Warrant (as
applicable), describing the transactions giving rise to such adjustments and
showing in detail the facts upon which such adjustment is based. Upon written
request, the Company will promptly deliver a copy of each such certificate to
the Holder and to the Company's Transfer Agent.

            (h) Notice of Corporate Events. If the Company (i) declares a
dividend or any other distribution of cash, securities or other property in
respect of its Common Stock, including without limitation any granting of rights
or warrants to subscribe for or purchase any capital stock of the Company or any
Subsidiary, (ii) authorizes or approves, enters into any agreement contemplating
or solicits stockholder approval for any Fundamental Transaction or (iii)
authorizes the voluntary dissolution, liquidation or winding up of the affairs
of the Company, then the Company shall deliver to the Holder a notice describing
the material terms and conditions of such transaction, at least 20 calendar days
prior to the applicable record or effective date on which a Person would need to
hold Common Stock in order to participate in or vote with respect to such
transaction, and the Company will take all steps reasonably necessary in order
to insure that the Holder is given the practical opportunity to exercise this
Warrant prior to such time so as to participate in or vote with respect to such
transaction; provided, however, that the failure to deliver such notice or any
defect therein shall not affect the validity of the corporate action required to
be described in such notice.

      9. Payment of Exercise Price. The Holder shall pay the Exercise Price in
one of the following manners:

            (a) Cash Exercise. The Holder may deliver immediately available
funds; or

            (b) Cashless Exercise. The Holder may satisfy its obligation to pay
the Exercise Price through a "cashless exercise," in which event the Company
shall issue to the Holder the number of Warrant Shares determined as follows:

                                  X = Y [(A-B)/A]

                  where:

                                  X = the number of Warrant Shares to be issued
                                  to the Holder.

                                  Y = the number of Warrant Shares with respect
                                  to which this Warrant is being exercised.

                                  A = the average of the Closing Prices for the
                                  five Trading Days immediately prior to (but
                                  not including) the Exercise Date.

                                  B = the Exercise Price.

For purposes of Rule 144 promulgated under the Securities Act, it is intended,
understood and acknowledged that the Warrant Shares issued in a cashless
exercise transaction shall be deemed to have been acquired by the Holder, and
the holding period for the Warrant Shares shall be


                                       7

deemed to have commenced, on the date this Warrant was originally issued
pursuant to the Purchase Agreement.

      10. Limitation on Exercise.

            (a) Notwithstanding anything to the contrary contained herein, the
number of shares of Common Stock that may be acquired by the Holder upon any
exercise of this Warrant (or otherwise in respect hereof) shall be limited to
the extent necessary to insure that, following such exercise (or other
issuance), the total number of shares of Common Stock then beneficially owned by
such Holder and its Affiliates and any other Persons whose beneficial ownership
of Common Stock would be aggregated with the Holder's for purposes of Section
13(d) of the Exchange Act, does not exceed 4.999% (the "MAXIMUM PERCENTAGE") of
the total number of issued and outstanding shares of Common Stock (including for
such purpose the shares of Common Stock issuable upon such exercise). For such
purposes, beneficial ownership shall be determined in accordance with Section
13(d) of the Exchange Act and the rules and regulations promulgated thereunder.
Each delivery of an Exercise Notice hereunder will constitute a representation
by the Holder that it has evaluated the limitation set forth in this paragraph
and determined that issuance of the full number of Warrant Shares requested in
such Exercise Notice is permitted under this paragraph. The Company's obligation
to issue shares of Common Stock in excess of the limitation referred to in this
Section shall be suspended (and shall not terminate or expire notwithstanding
any contrary provisions hereof) until such time, if any, as such shares of
Common Stock may be issued in compliance with such limitation. By written notice
to the Company, the Holder may waive the provisions of this Section or increase
or decrease the Maximum Percentage to any other percentage specified in such
notice, but (i) any such waiver or increase will not be effective until the 61st
day after such notice is delivered to the Company, and (ii) any such waiver or
increase or decrease will apply only to the Holder and not to any other holder
of Warrants.

            (b) Notwithstanding anything to the contrary contained herein, if
the Trading Market is the Nasdaq National Market or the Nasdaq SmallCap Market
or any other market or exchange with similar applicable rules, then the maximum
number of shares of Common Stock that the Company may issue pursuant to the
Transaction Documents at an effective purchase price less than the Closing Price
on the Trading Day immediately preceding the Closing Date equals 5,825,000
shares (as adjusted for stock splits, stock combinations or similar events) (the
"ISSUABLE MAXIMUM"), unless the Company obtains shareholder approval in
accordance with the rules and regulations of such Trading Market. If, at the
time any Purchaser requests an exercise of any of the Warrants, the Actual
Minimum (excluding any shares issued or issuable at an effective purchase price
in excess of the Closing Price on the Trading Day immediately preceding the
Closing Date) exceeds the Issuable Maximum (and if the Company has not
previously obtained the required shareholder approval), then the Company shall
issue to the Purchaser requesting such exercise a number of shares of Common
Stock not exceeding such Purchaser's pro-rata portion of the Issuable Maximum
(based on such Purchaser's share (vis-a-vis other Purchasers) of the aggregate
purchase price paid under the Purchase Agreement and taking into account any
Warrant Shares previously issued to such Purchaser), and the remainder of the
Warrant Shares issuable in connection with such exercise or conversion (if any)
shall constitute "Excess Shares" pursuant to Section 10(c) below.


                                       8

            (c) In the event that any Purchaser's receipt of shares of Common
Stock upon restricted based on the Issuable Maximum, the Company shall either:
(i) use its best efforts to obtain the required shareholder approval necessary
to permit the issuance of such Excess Shares as soon as is reasonably possible,
but in any event not later than the 60th day after the event giving rise to such
Excess Shares, or (ii) within five Trading Days after such event, pay cash to
such Purchaser, as liquidated damages and not as a penalty, in an amount equal
to the difference between the Black-Scholes value of this Warrant assuming the
limitations in Section 10(b) were not applicable and the Black-Scholes value of
this Warrant after giving effect to the limitations in Section 10(b), measured
as of the date of such event or, if greater, the date of payment (such
difference, the "Cash Amount"). For the purposes of this Section 10(c) the
Black-Scholes value of this Warrant shall be calculated in a manner consistent
with the manner in which the Company performs Black-Scholes calculations to
determine the fair value of option grants for the purposes of the financial
statements contained in its SEC Reports. If the Company elects the first option
under the preceding sentence and the Company fails to obtain the required
shareholder approval on or prior to the 60th day after such event, then within
three Trading Days after such 60th day, the Company shall pay the Cash Amount to
such Purchaser, as liquidated damages and not as a penalty.

      11. Fractional Shares. The Company shall not be required to issue or cause
to be issued fractional Warrant Shares on the exercise of this Warrant. If any
fraction of a Warrant Share would, except for the provisions of this Section, be
issuable upon exercise of this Warrant, the number of Warrant Shares to be
issued will be rounded up to the nearest whole share.

      12. Notices. Any and all notices or other communications or deliveries
hereunder (including without limitation any Exercise Notice) shall be in writing
and shall be deemed given and effective on the earliest of (i) the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile number specified in this Section prior to 6:30 p.m. (New York City
time) on a Trading Day, (ii) the next Trading Day after the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile number specified in this Section on a day that is not a Trading Day or
later than 6:30 p.m. (New York City time) on any Trading Day, (iii) the Trading
Day following the date of mailing, if sent by nationally recognized overnight
courier service, or (iv) upon actual receipt by the party to whom such notice is
required to be given. The address for such notices or communications shall be as
set forth in the Purchase Agreement.

      13. Warrant Agent. The Company shall serve as warrant agent under this
Warrant. Upon 30 days' notice to the Holder, the Company may appoint a new
warrant agent. Any corporation into which the Company or any new warrant agent
may be merged or any corporation resulting from any consolidation to which the
Company or any new warrant agent shall be a party or any corporation to which
the Company or any new warrant agent transfers substantially all of its
corporate trust or shareholders services business shall be a successor warrant
agent under this Warrant without any further act. Any such successor warrant
agent shall promptly cause notice of its succession as warrant agent to be
mailed (by first class mail, postage prepaid) to the Holder at the Holder's last
address as shown on the Warrant Register.

      14. Loss, Theft or Destruction of Warrant. In the event that the Holder
notifies the Company that this Warrant has been lost, stolen or destroyed, then
a replacement Warrant,


                                       9

identical in all respects to the original Warrant (except for any registration
number and any adjustment pursuant hereto to the Exercise Price or number of
Warrant Shares issuable hereunder, if different that the numbers shown on the
original Warrant) shall be delivered to the Holder by the Company, provided that
such Holder executes and delivers to the Company an agreement reasonably
satisfactory to the Company to indemnify the Company from any loss incurred by
the Company in connection with such Warrant.

      15. No Rights as Stockholder until Exercise. Subject to Section 8 of this
Warrant and the provisions of any other Transaction Documents, prior to the
exercise of this Warrant as provided herein, the Holder shall not be entitled to
vote or receive dividends or be deemed the holder of Warrant Shares or any other
securities of the Company that may at any time be issuable on the exercise
hereof for any purpose, nor shall anything contained herein be construed to
confer upon the Holder, as such, any of the rights of a stockholder of the
Company or any right to vote for the election of directors or upon any matter
submitted to the stockholders at any meeting thereof, or to give or withhold
consent to any corporate action or to receive notice of meetings, or to receive
dividend or subscription rights.

      16. Miscellaneous.

            (a) This Warrant shall be binding on and inure to the benefit of the
parties hereto and their respective successors and assigns. Subject to the
preceding sentence, nothing in this Warrant shall be construed to give to any
Person other than the Company and the Holder any legal or equitable right,
remedy or cause of action under this Warrant. This Warrant may be amended only
in writing signed by the Company and the Holder and their successors and
assigns.

            (b) The Company will not, by amendment of its governing documents or
through any reorganization, transfer of assets, consolidation, merger,
dissolution, issue or sale of securities or any other voluntary action, avoid or
seek to avoid the observance or performance of any of the terms of this Warrant,
but will at all times in good faith assist in the carrying out of all such terms
and in the taking of all such action as may be necessary or appropriate in order
to protect the rights of the Holder against impairment. Without limiting the
generality of the foregoing, the Company (i) will not increase the par value of
any Warrant Shares above the amount payable therefor on such exercise, (ii) will
take all such action as may be reasonably necessary or appropriate in order that
the Company may validly and legally issue fully paid and nonassessable Warrant
Shares on the exercise of this Warrant, and (iii) will not close its shareholder
books or records in any manner which interferes with the timely exercise of this
Warrant.

            (c) GOVERNING LAW; VENUE; WAIVER OF JURY TRIAL. THE CORPORATE LAWS
OF THE STATE OF DELAWARE SHALL GOVERN ALL ISSUES CONCERNING THE RELATIVE RIGHTS
OF THE COMPANY AND ITS STOCKHOLDERS. ALL QUESTIONS CONCERNING THE CONSTRUCTION,
VALIDITY, ENFORCEMENT AND INTERPRETATION OF THIS WARRANT SHALL BE GOVERNED BY
AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.
EACH PARTY HEREBY IRREVOCABLY SUBMITS TO THE EXCLUSIVE JURISDICTION OF THE STATE
AND FEDERAL COURTS SITTING IN THE CITY OF NEW YORK, BOROUGH OF MANHATTAN, FOR
THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION HEREWITH OR WITH ANY


                                       10

TRANSACTION CONTEMPLATED HEREBY OR DISCUSSED HEREIN (INCLUDING WITH RESPECT TO
THE ENFORCEMENT OF ANY OF THE TRANSACTION DOCUMENTS), AND HEREBY IRREVOCABLY
WAIVES, AND AGREES NOT TO ASSERT IN ANY SUIT, ACTION OR PROCEEDING, ANY CLAIM
THAT IT IS NOT PERSONALLY SUBJECT TO THE JURISDICTION OF ANY SUCH COURT, THAT
SUCH SUIT, ACTION OR PROCEEDING IS IMPROPER. EACH PARTY HEREBY IRREVOCABLY
WAIVES PERSONAL SERVICE OF PROCESS AND CONSENTS TO PROCESS BEING SERVED IN ANY
SUCH SUIT, ACTION OR PROCEEDING BY MAILING A COPY THEREOF VIA REGISTERED OR
CERTIFIED MAIL OR OVERNIGHT DELIVERY (WITH EVIDENCE OF DELIVERY) TO SUCH PARTY
AT THE ADDRESS IN EFFECT FOR NOTICES TO IT UNDER THIS AGREEMENT AND AGREES THAT
SUCH SERVICE SHALL CONSTITUTE GOOD AND SUFFICIENT SERVICE OF PROCESS AND NOTICE
THEREOF. NOTHING CONTAINED HEREIN SHALL BE DEEMED TO LIMIT IN ANY WAY ANY RIGHT
TO SERVE PROCESS IN ANY MANNER PERMITTED BY LAW. THE COMPANY HEREBY WAIVES ALL
RIGHTS TO A TRIAL BY JURY.

            (d) The headings herein are for convenience only, do not constitute
a part of this Warrant and shall not be deemed to limit or affect any of the
provisions hereof.

            (e) In case any one or more of the provisions of this Warrant shall
be invalid or unenforceable in any respect, the validity and enforceability of
the remaining terms and provisions of this Warrant shall not in any way be
affected or impaired thereby and the parties will attempt in good faith to agree
upon a valid and enforceable provision which shall be a commercially reasonable
substitute therefor, and upon so agreeing, shall incorporate such substitute
provision in this Warrant.


                                       11

      IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed by its authorized officer as of the date first indicated above.

                                            ASPEN TECHNOLOGY, INC.


                                            By: ________________________________
                                            Name:_______________________________
                                            Title:______________________________


                                       12

                             FORM OF EXERCISE NOTICE

(To be executed by the Holder to exercise the right to purchase shares of Common
Stock under the foregoing Warrant)

To:  Aspen Technology, Inc.

The undersigned is the Holder of Warrant No. _______ (the "WARRANT") issued by
Aspen Technology, Inc., a Delaware corporation (the "COMPANY"). Capitalized
terms used herein and not otherwise defined have the respective meanings set
forth in the Warrant.

1.    The Warrant is currently exercisable to purchase a total of ______________
      Warrant Shares.

2.    The undersigned Holder hereby exercises its right to purchase
      _________________ Warrant Shares pursuant to the Warrant.

3.    The Holder intends that payment of the Exercise Price shall be made as
      (check one):

                        ____ "Cash Exercise" under Section 9(a)

                        ____ "Cashless Exercise" under Section 9(b)

4.    If the holder has elected a Cash Exercise, the holder shall pay the sum of
      $____________ to the Company in accordance with the terms of the Warrant.

5.    Pursuant to this exercise, the Company shall deliver to the holder
      _______________ Warrant Shares in accordance with the terms of the
      Warrant.

6.    Following this exercise, the Warrant shall be exercisable to purchase a
      total of ______________ Warrant Shares.

Dated: ________________,_____          Name of Holder:

                                       (Print)__________________________________


                                       By:______________________________________
                                       Name:____________________________________
                                       Title:___________________________________

                                       (Signature must conform in all respects
                                       to name of holder as specified on the
                                       face of the Warrant)

                               FORM OF ASSIGNMENT

      [To be completed and signed only upon transfer of Warrant]

      FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto ________________________________ the right represented by the within
Warrant to purchase ____________ shares of Common Stock of Aspen Technology,
Inc. to which the within Warrant relates and appoints ________________ attorney
to transfer said right on the books of Aspen Technology, Inc. with full power of
substitution in the premises.

Dated: ________________,_____


                                       _________________________________________
                                       (Signature must conform in all respects
                                       to name of holder as specified on the
                                       face of the Warrant)

                                       _________________________________________
                                       Address of Transferee

                                       _________________________________________

                                       _________________________________________

In the presence of:

____________________________


                                                                    EXHIBIT 99.5

                                 AMENDMENT NO. 1
                                       TO
                                 WARRANT NO. __
                                       OF
                             ASPEN TECHNOLOGY, INC.

      This Amendment No. 1 (the "AMENDMENT") to Warrant No. __ dated February
___, 2002 (the "WARRANT"), is entered into as of March 19, 2002 between Aspen
Technology, Inc., a Delaware corporation (the "Company"), and [__________] (the
"Holder"). Terms used and not otherwise defined herein shall have the meanings
ascribed to them in the Warrant.

      WHEREAS, the Company and the Purchasers, including the Holder, are
contemporaneously entering into the Amended and Restated Securities Purchase
Agreement dated as of the date hereof (the "PURCHASE AGREEMENT") and
consummating the Third Closing under the Purchase Agreement;

      WHEREAS, in connection with the execution and delivery of the Purchase
Agreement and the consummation of the Third Closing, the Company and the
Purchasers wish to amend certain provisions of each of the Warrants previously
issued to the Purchasers by the Company;

      NOW, THEREFORE, in consideration of the premises and mutual agreements set
forth herein, the Company and the Holder agree as follows:

      1. Section 7 of the Warrant is hereby deleted in its entirety and the
following is substituted in lieu thereof:

            "7. Reservation of Warrant Shares. The Company covenants that it
      will at all times reserve and keep available out of the aggregate of its
      authorized but unissued and otherwise unreserved Common Stock, solely for
      the purpose of enabling it to issue Warrant Shares upon exercise of the
      Warrants, each as therein provided, 791,044 shares of Common Stock (as
      adjusted for any stock splits, stock combinations or similar events), free
      from preemptive rights or any other contingent purchase rights of persons
      other than the Holder (taking into account the adjustments and
      restrictions of Section 8), less any shares of Common Stock issued upon
      exercise of the Warrants and reductions reasonably agreed to by the
      Purchasers to reflect shares of Common Stock issued upon exercise of the
      Warrants. The Company covenants that all Warrant Shares so issuable and
      deliverable shall, upon issuance and the payment of the applicable
      Exercise Price in accordance with the terms hereof, be duly and validly
      authorized, issued and fully paid and nonassessable. The Company will take
      all such action as may be necessary to assure that such shares of stock
      may be issued as provided herein without violation of any applicable law
      or regulation, or of any requirements of any securities exchange or
      automated quotation system upon which the stock may be listed (it being
      understood that the Company shall not be required to take any action to
      assure the issuance of stock to any Purchaser to the extent that such
      issuance is prohibited by some act or failure to act of such Purchaser)."

      2. Section 10(c) of the Warrant is hereby deleted in its entirety and the
following is substituted in lieu thereof:

            "(c) In the event that any Purchaser's receipt of shares of Common
      Stock is restricted based on the Issuable Maximum, the Company shall
      either: (i) use its best efforts to obtain the required shareholder
      approval necessary to permit the issuance of such Excess Shares as soon as
      is reasonably possible, but in any event not later than the 60th day after
      the event giving rise to such Excess Shares, or (ii) within five Trading
      Days after such event, pay to such Purchaser, as liquidated damages and
      not as a penalty, in an amount equal to the difference between the
      Black-Scholes value of this Warrant assuming the limitations in Section
      10(b) were not applicable and the Black-Scholes value of this Warrant
      after giving effect to the limitations in Section 10(b), measured as of
      the date of such event or, if greater, the date of payment (such
      difference, the "WARRANT DAMAGE AMOUNT"). For the purposes of this Section
      10(c) the Black-Scholes value of this Warrant shall be calculated in a
      manner consistent with the manner in which the Company performs
      Black-Scholes calculations to determine the fair value of option grants
      for the purposes of the financial statements contained in its SEC Reports.
      If the Company elects the option set forth in clause (i) above and the
      Company fails to obtain the required shareholder approval on or prior to
      the 60th day after such event, then within three Trading Days after such
      60th day, the Company shall pay the Warrant Damage Amount to such
      Purchaser, as liquidated damages and not as a penalty. Any Warrant Damage
      Amount may be paid at the Company's option in cash or in Series C
      Preferred Stock. In the event that the Company elects to pay the Warrant
      Damage Amount in shares of Series C Preferred Stock, the number of shares
      of Series C Preferred Stock to be issued to the Purchaser in payment of
      the Warrant Damage Amount shall be determined by dividing the total
      Warrant Damage Amount then payable to such Purchaser by $10,000 (the
      initial Stated Value per share of the Series C Preferred Stock) and
      rounding downward to the nearest whole number of shares of Series C
      Preferred Stock. In addition, the Company shall pay to the Purchaser in
      cash the amount, if any, by which the Warrant Damage Amount payable to
      such Purchaser exceeds the aggregate Stated Value of the Series C
      Preferred Stock issued pursuant to the preceding sentence. If the Warrant
      Damage Amount payable to such Purchaser is less than $10,000, then the
      Corporation shall pay such amount to such Purchaser entirely in cash."

      3. This Amendment may be executed in counterparts, both of which when
taken together shall be considered one and the same agreement and shall become
effective when counterparts have been signed by both parties to this Amendment
and each party has delivered its counterpart to the other party.

      4. Except as otherwise set forth in this Amendment, all other terms and
conditions of the Warrant shall remain the same and in full force and effect.

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                            SIGNATURE PAGE TO FOLLOW]


                                       2

      IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 1 to
be duly executed by their respective authorized signatories as of the date first
indicated above.

                                           ASPEN TECHNOLOGY, INC.

                                           By:__________________________________
                                               Lisa W. Zappala
                                               Senior Vice President and
                                               Chief Financial Officer


                                           [HOLDER]

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                       3


                                                                    EXHIBIT 99.6


                       FORM OF WARRANT FOR THIRD CLOSING

THESE SECURITIES HAVE NOT BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE
COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN
EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
"SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT
TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO
AN AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT
AND IN COMPLIANCE WITH APPLICABLE STATE SECURITIES OR BLUE SKY LAWS. THESE
SECURITIES AND THE SECURITIES ISSUABLE UPON EXERCISE OF THESE SECURITIES MAY BE
PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN SECURED BY
SUCH SECURITIES.

                             ASPEN TECHNOLOGY, INC.

                                     WARRANT

Warrant No. [ ]                                          Dated:  March 19, 2002

      Aspen Technology, Inc., a Delaware corporation (the "COMPANY"), hereby
certifies that, for value received, [Name of Holder] or its registered assigns
(the "HOLDER"), is entitled to purchase from the Company up to a total of
[_____] shares of common stock, $0.10 par value per share (the "COMMON STOCK"),
of the Company (each such share, a "WARRANT SHARE" and all such shares, the
"WARRANT SHARES") at an exercise price equal to $23.99 per share (as adjusted
from time to time as provided in Section 8, the "EXERCISE PRICE"), at any time
and from time to time from and after the date hereof and through and including
March 19, 2007 (the "EXPIRATION DATE"), and subject to the following terms and
conditions. This Warrant (this "Warrant") is one of a series of similar warrants
issued pursuant to that certain Amended and Restated Securities Purchase
Agreement, dated as of the date hereof, by and among the Company and the
Purchasers identified therein (the "PURCHASE AGREEMENT"). All such warrants are
referred to herein, collectively, as the "WARRANTS."

      1. Definitions. In addition to the terms defined elsewhere in this
Warrant, capitalized terms that are not otherwise defined herein have the
meanings given to such terms in the Purchase Agreement.

      2. Registration of Warrant. The Company shall register this Warrant, upon
records to be maintained by the Company for that purpose (the "WARRANT
REGISTER"), in the name of the record Holder hereof from time to time. The
Company may deem and treat the registered Holder of this Warrant as the absolute
owner hereof for the purpose of any exercise hereof or any distribution to the
Holder, and for all other purposes, absent actual notice to the contrary.

      3. Registration of Transfers. The Company shall register the transfer of
any portion of this Warrant in the Warrant Register, upon surrender of this
Warrant, with the Form of Assignment attached hereto duly completed and signed
by the Holder, to the Transfer Agent or to the Company at its address specified
herein, provided that any such assignment shall be pursuant to a Qualified
Transfer. Upon any such registration or transfer, a new warrant to purchase
Common Stock, in substantially the form of this Warrant (any such new warrant, a
"NEW WARRANT"), evidencing the portion of this Warrant so transferred shall be
issued to the transferee and a New Warrant evidencing the remaining portion of
this Warrant not so transferred, if any, shall be issued to the transferring
Holder. The acceptance of the New Warrant by the transferee thereof shall be
deemed the acceptance by such transferee of all of the rights and obligations of
a holder of a Warrant.

      4. Exercise and Duration of Warrant.

            (a) This Warrant shall be exercisable by the registered Holder at
any time and from time to time on or after the date hereof to and including the
Expiration Date. At 6:30 P.M., New York City time on the Expiration Date, the
portion of this Warrant not exercised prior thereto shall be and become void and
of no value; provided that, if the average of the Closing Prices for the five
Trading Days immediately prior to (but not including) the Expiration Date
exceeds the Exercise Price on the Expiration Date, then this Warrant shall be
deemed to have been exercised in full (to the extent not previously exercised)
on a "cashless exercise" basis at 6:30 P.M. New York City time on the Expiration
Date.

            (b) Except as provided in Section 4(a), a Holder may exercise this
Warrant by delivering to the Company (i) an Exercise Notice, in the form
attached hereto, appropriately completed and duly signed, and (ii) payment of
the Exercise Price for the number of Warrant Shares as to which this Warrant is
being exercised (which may take the form of a "cashless exercise" if so
indicated in the Exercise Notice), and the date such items are delivered to the
Company (as determined in accordance with the notice provisions hereof), or the
Warrant has been deemed to have been exercised pursuant to Section 4(a), is an
"EXERCISE DATE." The Holder shall not be required to deliver the original
Warrant in order to effect an exercise hereunder. Execution and delivery of the
Exercise Notice shall have the same effect as cancellation of the original
Warrant and issuance of a New Warrant evidencing the right to purchase the
remaining number of Warrant Shares.

      5. Delivery of Warrant Shares.

            (a) Upon exercise of this Warrant, the Company shall promptly (but
in no event later than three Trading Days after the Exercise Date) issue or
cause to be issued and cause to be delivered to or upon the written order of the
Holder and in such name or names as the Holder may designate, a certificate for
the Warrant Shares issuable upon such exercise, free of restrictive legends
unless a registration statement covering the resale of the Warrant Shares and
naming the Holder as a selling stockholder thereunder is not then effective and
the Warrant Shares are not freely transferable without volume restrictions
pursuant to Rule 144 under the Securities Act. Notwithstanding the foregoing, if
the Warrant is deemed to have been exercised pursuant to Section 4(a), then the
Company shall issue or cause to be issued a certificate for the Warrant Shares
issuable upon such exercise no later than three Trading Days after the Holder


                                       2

delivers a notice to the Company in accordance with Section 12 that the Warrant
was deemed to have been exercised pursuant to Section 4(a). The Holder, or any
Person so designated by the Holder to receive Warrant Shares, shall be deemed to
have become holder of record of such Warrant Shares as of the Exercise Date. The
Company shall, upon request of the Holder, use its commercially reasonable best
efforts to deliver Warrant Shares hereunder electronically through the
Depository Trust Corporation or another established clearing corporation
performing similar functions.

            (b) This Warrant is exercisable, either in its entirety or, from
time to time, for a portion of the number of Warrant Shares. Upon surrender of
this Warrant following one or more partial exercises, the Company shall issue or
cause to be issued, at its expense, a New Warrant evidencing the right to
purchase the remaining number of Warrant Shares.

            (c) The Company's obligations to issue and deliver Warrant Shares
subject to and in accordance with the terms hereof are absolute and
unconditional, irrespective of any action or inaction by the Holder to enforce
the same, any waiver or consent with respect to any provision hereof, the
recovery of any judgment against any Person or any action to enforce the same,
or any setoff, counterclaim, recoupment, limitation or termination, or any
breach or alleged breach by the Holder or any other Person of any obligation to
the Company or any violation or alleged violation of law by the Holder or any
other Person, and irrespective of any other circumstance which might otherwise
limit such obligation of the Company to the Holder in connection with the
issuance of Warrant Shares.

      6. Charges, Taxes and Expenses. Issuance of certificates for shares of
Common Stock upon exercise of this Warrant shall be made without charge to the
Holder for any issue or transfer tax, withholding tax, transfer agent fee or
other incidental tax or expense in respect of the issuance of such certificates,
all of which taxes and expenses shall be paid by the Company; provided, however,
that the Company shall not be required to pay any tax which may be payable in
respect of any transfer involved in the registration of any certificates for
Warrant Shares or Warrants in a name other than that of the Holder. The Holder
shall be responsible for all other tax liability that may arise as a result of
holding or transferring this Warrant or receiving Warrant Shares upon exercise
hereof.

      7. Reservation of Warrant Shares. The Company covenants that it will at
all times reserve and keep available out of the aggregate of its authorized but
unissued and otherwise unreserved Common Stock, solely for the purpose of
enabling it to issue Warrant Shares upon exercise of the Warrants, each as
therein provided, 791,044 shares of Common Stock (as adjusted for any stock
splits, stock combinations or similar events), free from preemptive rights or
any other contingent purchase rights of persons other than the Holder (taking
into account the adjustments and restrictions of Section 8), less any shares of
Common Stock issued upon exercise of the Warrants and reductions reasonably
agreed to by the Purchasers to reflect shares of Common Stock issued upon
exercise of the Warrants. The Company covenants that all Warrant Shares so
issuable and deliverable shall, upon issuance and the payment of the applicable
Exercise Price in accordance with the terms hereof, be duly and validly
authorized, issued and fully paid and nonassessable. The Company will take all
such action as may be necessary to assure that such shares of stock may be
issued as provided herein without violation of any applicable law or regulation,
or of any requirements of any securities exchange or


                                       3

automated quotation system upon which the stock may be listed (it being
understood that the Company shall not be required to take any action to assure
the issuance of stock to any Purchaser to the extent that such issuance is
prohibited by some act or failure to act of such Purchaser).

      8. Certain Adjustments. The Exercise Price and number of Warrant Shares
issuable upon exercise of this Warrant are subject to adjustment from time to
time as set forth in this Section 8.

            (a) Stock Dividends and Splits. If the Company, at any time while
this Warrant is outstanding, (i) pays a stock dividend on its Common Stock or
otherwise makes a distribution on any class of capital stock that is payable in
shares of Common Stock, (ii) subdivides outstanding shares of Common Stock into
a larger number of shares, or (iii) combines outstanding shares of Common Stock
into a smaller number of shares, then in each such case the Exercise Price shall
be multiplied by a fraction of which the numerator shall be the number of shares
of Common Stock outstanding immediately before such event and of which the
denominator shall be the number of shares of Common Stock outstanding
immediately after such event. Any adjustment made pursuant to clause (i) of this
paragraph shall become effective immediately after the record date for the
determination of stockholders entitled to receive such dividend or distribution,
and any adjustment pursuant to clause (ii) or (iii) of this paragraph shall
become effective immediately after the effective date of such subdivision or
combination.

            (b) Pro Rata Distributions. If the Company, at any time while this
Warrant is outstanding, distributes to holders of Common Stock (i) evidences of
its indebtedness, (ii) any security (other than a distribution of Common Stock
covered by the preceding paragraph), (iii) rights or warrants to subscribe for
or purchase any security, or (iv) any other asset (in each case, "DISTRIBUTED
PROPERTY"), then in each such case the Exercise Price in effect immediately
prior to the record date fixed for determination of stockholders entitled to
receive such distribution shall be adjusted (effective on such record date) to
equal the product of such Exercise Price times a fraction of which the
denominator shall be the average of the Closing Prices for the last five Trading
Days immediately prior to (but not including) such record date and of which the
numerator shall be such average less the then fair market value of the
Distributed Property distributed in respect of one outstanding share of Common
Stock, as determined by the Company's independent certified public accountants
that regularly examine the financial statements of the Company, or, if such
accountants are unable or unwilling to make such determination for any reason,
then a nationally recognized investment banking firm or accounting firm
designated by the Company (an "APPRAISER"). In such event, the Holder, after
receipt of the determination by the Appraiser, shall have the right to select an
additional appraiser (which shall be a nationally recognized investment banking
firm or accounting firm), in which case such fair market value shall be deemed
to equal the average of the values determined by each of the Appraiser and such
appraiser. As an alternative to the foregoing adjustment to the Exercise Price,
at the request of the Holder delivered before the 90th day after such record
date, the Company, within five Trading Days after such request (or, if later, on
the effective date of such distribution), will place the Distributed Property
that such Holder would have been entitled to receive in respect of the Warrant
Shares for which this Warrant could have been exercised immediately prior to
such record date in escrow with an escrow agent selected by the Company and
reasonably acceptable to the Holder. Thereafter, upon exercise of this Warrant
in accordance with Section 4, the Holder shall be entitled to receive, in
addition to the number of


                                       4

Warrant Shares issuable such exercise, that portion of the escrowed Distributed
Property attributable to the number of Warrant Shares for which the Warrant has
been exercised, giving effect to all applicable adjustments called for pursuant
to this Section 8 during such escrow period.

            (c) Fundamental Transactions. If, at any time while this Warrant is
outstanding, (i) the Company effects any merger or consolidation of the Company
with or into another Person, (ii) the Company effects any sale of all or
substantially all of its assets in one or a series of related transactions,
(iii) any tender offer or exchange offer (whether by the Company or another
Person) is completed pursuant to which holders of Common Stock are permitted to
tender or exchange their shares for other securities, cash or property, or (iv)
the Company effects any reclassification of the Common Stock or any compulsory
share exchange pursuant to which the Common Stock is effectively converted into
or exchanged for other securities, cash or property (in any such case, a
"FUNDAMENTAL TRANSACTION"), then the Holder shall have the right thereafter to
receive, upon exercise of this Warrant, the same amount and kind of securities,
cash or property as it would have been entitled to receive upon the occurrence
of such Fundamental Transaction if it had been, immediately prior to such
Fundamental Transaction, the holder of the number of Warrant Shares then
issuable upon exercise in full of this Warrant (the "ALTERNATE CONSIDERATION").
The aggregate Exercise Price for this Warrant will not be affected by any such
Fundamental Transaction, but the Company shall apportion such aggregate Exercise
Price among the Alternate Consideration in a reasonable manner reflecting the
relative value of any different components of the Alternate Consideration. If
holders of Common Stock are given any choice as to the securities, cash or
property to be received in a Fundamental Transaction, then the Holder shall be
given the same choice as to the Alternate Consideration it receives upon any
exercise of this Warrant following such Fundamental Transaction. At the Holder's
request, any successor to the Company or surviving entity in such Fundamental
Transaction shall issue to the Holder a new warrant consistent with the
foregoing provisions, provided that

                  (i) the covenant set forth in Section 7 relating to the
      reservation of Common Stock shall be replaced with a covenant to the
      effect that sufficient Alternate Consideration shall be reserved for
      issuance upon exercise of the Warrant, and

                  (ii) Sections 8(d) and 10 shall be deleted in their entirety,

and evidencing the Holder's right to purchase the Alternate Consideration for
the aggregate Exercise Price upon exercise thereof. The terms of any agreement
pursuant to which a Fundamental Transaction is effected shall include terms
requiring any such successor or surviving entity to comply with the provisions
of this paragraph (c) and ensuring that the Warrant (or any such replacement
security) will be similarly adjusted upon any subsequent transaction analogous
to a Fundamental Transaction.

            (d) Subsequent Equity Sales.

                  (i) If, at any time while this Warrant is outstanding, the
      Company or any Subsidiary issues additional shares of Common Stock or
      rights, warrants, options or other securities or debt convertible,
      exercisable or exchangeable for shares of Common Stock or otherwise
      entitling any Person to acquire shares of Common Stock (collectively,


                                       5

      "Common Stock Equivalents") at an effective net price to the Company per
      share of Common Stock (the "Effective Price") less than the Exercise Price
      (as adjusted hereunder to such date), then the Exercise Price shall be
      reduced to equal the Effective Price. For purposes of this paragraph, in
      connection with any issuance of any Common Stock Equivalents, (A) the
      maximum number of shares of Common Stock potentially issuable at any time
      upon conversion, exercise or exchange of such Common Stock Equivalents
      (the "Deemed Number") shall be deemed to be outstanding upon issuance of
      such Common Stock Equivalents, (B) the Effective Price applicable to such
      Common Stock shall equal the minimum net dollar value of consideration
      payable to the Company to purchase such Common Stock Equivalents and to
      convert, exercise or exchange them into Common Stock, divided by the
      Deemed Number, and (C) no further adjustment shall be made to the Exercise
      Price upon the actual issuance of Common Stock upon conversion, exercise
      or exchange of such Common Stock Equivalents.

                  (ii) If, at any time while this Warrant is outstanding, the
      Company or any Subsidiary issues Common Stock Equivalents with an
      Effective Price or a number of underlying shares that floats or resets or
      otherwise varies or is subject to adjustment based (directly or
      indirectly) on market prices of the Common Stock (a "Floating Price
      Security"), then for purposes of applying the preceding paragraph in
      connection with any subsequent exercise, the Effective Price will be
      determined separately on each Exercise Date and will be deemed to equal
      the lowest Effective Price at which any holder of such Floating Price
      Security is entitled to acquire Common Stock on such Exercise Date
      (regardless of whether any such holder actually acquires any shares on
      such date).

                  (iii) Notwithstanding the foregoing, no adjustment will be
      made under this paragraph (d) in respect of any Excluded Stock.

            (e) Number of Warrant Shares. Simultaneously with any adjustment to
the Exercise Price pursuant to paragraphs (a), (b) or (d) of this Section, the
number of Warrant Shares that may be purchased upon exercise of this Warrant
shall be increased or decreased proportionately, so that after such adjustment
the aggregate Exercise Price payable hereunder for the increased or decreased
number of Warrant Shares shall be the same as the aggregate Exercise Price in
effect immediately prior to such adjustment.

            (f) Calculations. All calculations under this Section 8 shall be
made to the nearest cent or the nearest 1/100th of a share, as applicable. The
number of shares of Common Stock outstanding at any given time shall not include
shares owned or held by or for the account of the Company, and the disposition
of any such shares shall be considered an issue or sale of Common Stock.

            (g) Notice of Adjustments. Upon the occurrence of each adjustment
pursuant to this Section 8, the Company at its expense will promptly compute
such adjustment in accordance with the terms of this Warrant and prepare a
certificate setting forth such adjustment, including a statement of the adjusted
Exercise Price and adjusted number or type of Warrant Shares or other securities
issuable upon exercise of this Warrant (as applicable), describing the
transactions giving rise to such adjustments and showing in detail the facts
upon which such


                                       6

adjustment is based. Upon written request, the Company will promptly deliver a
copy of each such certificate to the Holder and to the Company's Transfer Agent.

            (h) Notice of Corporate Events. If the Company (i) declares a
dividend or any other distribution of cash, securities or other property in
respect of its Common Stock, including without limitation any granting of rights
or warrants to subscribe for or purchase any capital stock of the Company or any
Subsidiary, (ii) authorizes or approves, enters into any agreement contemplating
or solicits stockholder approval for any Fundamental Transaction or (iii)
authorizes the voluntary dissolution, liquidation or winding up of the affairs
of the Company, then the Company shall deliver to the Holder a notice describing
the material terms and conditions of such transaction, at least 20 calendar days
prior to the applicable record or effective date on which a Person would need to
hold Common Stock in order to participate in or vote with respect to such
transaction, and the Company will take all steps reasonably necessary in order
to insure that the Holder is given the practical opportunity to exercise this
Warrant prior to such time so as to participate in or vote with respect to such
transaction; provided, however, that the failure to deliver such notice or any
defect therein shall not affect the validity of the corporate action required to
be described in such notice.

      9. Payment of Exercise Price. The Holder shall pay the Exercise Price in
one of the following manners:

            (a) Cash Exercise. The Holder may deliver immediately available
funds; or

            (b) Cashless Exercise. The Holder may satisfy its obligation to pay
the Exercise Price through a "cashless exercise," in which event the Company
shall issue to the Holder the number of Warrant Shares determined as follows:

                                      X = Y [(A-B)/A]
             where:
                                      X = the number of Warrant Shares to be
                                      issued to the Holder.

                                      Y = the number of Warrant Shares with
                                      respect to which this Warrant is being
                                      exercised.

                                      A = the average of the Closing Prices for
                                      the five Trading Days immediately prior to
                                      (but not including) the Exercise Date.

                                      B = the Exercise Price.

For purposes of Rule 144 promulgated under the Securities Act, it is intended,
understood and acknowledged that the Warrant Shares issued in a cashless
exercise transaction shall be deemed to have been acquired by the Holder, and
the holding period for the Warrant Shares shall be deemed to have commenced, on
the date this Warrant was originally issued pursuant to the Purchase Agreement.


                                       7

      10. Limitation on Exercise.

            (a) Notwithstanding anything to the contrary contained herein, the
number of shares of Common Stock that may be acquired by the Holder upon any
exercise of this Warrant (or otherwise in respect hereof) shall be limited to
the extent necessary to insure that, following such exercise (or other
issuance), the total number of shares of Common Stock then beneficially owned by
such Holder and its Affiliates and any other Persons whose beneficial ownership
of Common Stock would be aggregated with the Holder's for purposes of Section
13(d) of the Exchange Act, does not exceed 4.999% (the "MAXIMUM PERCENTAGE") of
the total number of issued and outstanding shares of Common Stock (including for
such purpose the shares of Common Stock issuable upon such exercise). For such
purposes, beneficial ownership shall be determined in accordance with Section
13(d) of the Exchange Act and the rules and regulations promulgated thereunder.
Each delivery of an Exercise Notice hereunder will constitute a representation
by the Holder that it has evaluated the limitation set forth in this paragraph
and determined that issuance of the full number of Warrant Shares requested in
such Exercise Notice is permitted under this paragraph. The Company's obligation
to issue shares of Common Stock in excess of the limitation referred to in this
Section shall be suspended (and shall not terminate or expire notwithstanding
any contrary provisions hereof) until such time, if any, as such shares of
Common Stock may be issued in compliance with such limitation. By written notice
to the Company, the Holder may waive the provisions of this Section or increase
or decrease the Maximum Percentage to any other percentage specified in such
notice, but (i) any such waiver or increase will not be effective until the 61st
day after such notice is delivered to the Company, and (ii) any such waiver or
increase or decrease will apply only to the Holder and not to any other holder
of Warrants.

            (b) Notwithstanding anything to the contrary contained herein, if
the Trading Market is the Nasdaq National Market or the Nasdaq SmallCap Market
or any other market or exchange with similar applicable rules, then the maximum
number of shares of Common Stock that the Company may issue pursuant to the
Transaction Documents at an effective purchase price less than the Closing Price
on the Trading Day immediately preceding the Closing Date equals 6,401,394
shares (as adjusted for stock splits, stock combinations or similar events) (the
"ISSUABLE MAXIMUM"), unless the Company obtains shareholder approval in
accordance with the rules and regulations of such Trading Market. If, at the
time any Purchaser requests an exercise of any of the Warrants, the Actual
Minimum (excluding any shares issued or issuable at an effective purchase price
in excess of the Closing Price on the Trading Day immediately preceding the
Closing Date) exceeds the Issuable Maximum (and if the Company has not
previously obtained the required shareholder approval), then the Company shall
issue to the Purchaser requesting such exercise a number of shares of Common
Stock not exceeding such Purchaser's pro-rata portion of the Issuable Maximum
(based on such Purchaser's share (vis-a-vis other Purchasers) of the aggregate
purchase price paid under the Purchase Agreement and taking into account any
Warrant Shares previously issued to such Purchaser), and the remainder of the
Warrant Shares issuable in connection with such exercise or conversion (if any)
shall constitute "Excess Shares" pursuant to Section 10(c) below.

            (c) In the event that any Purchaser's receipt of shares of Common
Stock is restricted based on the Issuable Maximum, the Company shall either: (i)
use its best efforts to obtain the required shareholder approval necessary to
permit the issuance of such Excess Shares


                                       8

as soon as is reasonably possible, but in any event not later than the 60th day
after the event giving rise to such Excess Shares, or (ii) within five Trading
Days after such event, pay to such Purchaser, as liquidated damages and not as a
penalty, in an amount equal to the difference between the Black-Scholes value of
this Warrant assuming the limitations in Section 10(b) were not applicable and
the Black-Scholes value of this Warrant after giving effect to the limitations
in Section 10(b), measured as of the date of such event or, if greater, the date
of payment (such difference, the "WARRANT DAMAGE AMOUNT"). For the purposes of
this Section 10(c) the Black-Scholes value of this Warrant shall be calculated
in a manner consistent with the manner in which the Company performs
Black-Scholes calculations to determine the fair value of option grants for the
purposes of the financial statements contained in its SEC Reports. If the
Company elects the option set forth in clause (i) above and the Company fails to
obtain the required shareholder approval on or prior to the 60th day after such
event, then within three Trading Days after such 60th day, the Company shall pay
the Warrant Damage Amount to such Purchaser, as liquidated damages and not as a
penalty. Any Warrant Damage Amount may be paid at the Company's option in cash
or in Series C Preferred Stock. In the event that the Company elects to pay the
Warrant Damage Amount in shares of Series C Preferred Stock, the number of
shares of Series C Preferred Stock to be issued to the Purchaser in payment of
the Warrant Damage Amount shall be determined by dividing the total Warrant
Damage Amount then payable to such Purchaser by $10,000 (the initial Stated
Value per share of the Series C Preferred Stock) and rounding downward to the
nearest whole number of shares of Series C Preferred Stock. In addition, the
Company shall pay to the Purchaser in cash the amount, if any, by which the
Warrant Damage Amount payable to such Purchaser exceeds the aggregate Stated
Value of the Series C Preferred Stock issued pursuant to the preceding sentence.
If the Warrant Damage Amount payable to such Purchaser is less than $10,000,
then the Corporation shall pay such amount to such Purchaser entirely in cash.

      11. Fractional Shares. The Company shall not be required to issue or cause
to be issued fractional Warrant Shares on the exercise of this Warrant. If any
fraction of a Warrant Share would, except for the provisions of this Section, be
issuable upon exercise of this Warrant, the number of Warrant Shares to be
issued will be rounded up to the nearest whole share.

      12. Notices. Any and all notices or other communications or deliveries
hereunder (including without limitation any Exercise Notice) shall be in writing
and shall be deemed given and effective on the earliest of (i) the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile number specified in this Section prior to 6:30 p.m. (New York City
time) on a Trading Day, (ii) the next Trading Day after the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile number specified in this Section on a day that is not a Trading Day or
later than 6:30 p.m. (New York City time) on any Trading Day, (iii) the Trading
Day following the date of mailing, if sent by nationally recognized overnight
courier service, or (iv) upon actual receipt by the party to whom such notice is
required to be given. The address for such notices or communications shall be as
set forth in the Purchase Agreement.

      13. Warrant Agent. The Company shall serve as warrant agent under this
Warrant. Upon 30 days' notice to the Holder, the Company may appoint a new
warrant agent. Any corporation into which the Company or any new warrant agent
may be merged or any corporation resulting from any consolidation to which the
Company or any new warrant agent


                                       9

shall be a party or any corporation to which the Company or any new warrant
agent transfers substantially all of its corporate trust or shareholders
services business shall be a successor warrant agent under this Warrant without
any further act. Any such successor warrant agent shall promptly cause notice of
its succession as warrant agent to be mailed (by first class mail, postage
prepaid) to the Holder at the Holder's last address as shown on the Warrant
Register.

      14. Loss, Theft or Destruction of Warrant. In the event that the Holder
notifies the Company that this Warrant has been lost, stolen or destroyed, then
a replacement Warrant, identical in all respects to the original Warrant (except
for any registration number and any adjustment pursuant hereto to the Exercise
Price or number of Warrant Shares issuable hereunder, if different that the
numbers shown on the original Warrant) shall be delivered to the Holder by the
Company, provided that such Holder executes and delivers to the Company an
agreement reasonably satisfactory to the Company to indemnify the Company from
any loss incurred by the Company in connection with such Warrant.

      15. No Rights as Stockholder until Exercise. Subject to Section 8 of this
Warrant and the provisions of any other Transaction Documents, prior to the
exercise of this Warrant as provided herein, the Holder shall not be entitled to
vote or receive dividends or be deemed the holder of Warrant Shares or any other
securities of the Company that may at any time be issuable on the exercise
hereof for any purpose, nor shall anything contained herein be construed to
confer upon the Holder, as such, any of the rights of a stockholder of the
Company or any right to vote for the election of directors or upon any matter
submitted to the stockholders at any meeting thereof, or to give or withhold
consent to any corporate action or to receive notice of meetings, or to receive
dividend or subscription rights.

      16. Miscellaneous.

            (a) This Warrant shall be binding on and inure to the benefit of the
parties hereto and their respective successors and assigns. Subject to the
preceding sentence, nothing in this Warrant shall be construed to give to any
Person other than the Company and the Holder any legal or equitable right,
remedy or cause of action under this Warrant. This Warrant may be amended only
in writing signed by the Company and the Holder and their successors and
assigns.

            (b) The Company will not, by amendment of its governing documents or
through any reorganization, transfer of assets, consolidation, merger,
dissolution, issue or sale of securities or any other voluntary action, avoid or
seek to avoid the observance or performance of any of the terms of this Warrant,
but will at all times in good faith assist in the carrying out of all such terms
and in the taking of all such action as may be necessary or appropriate in order
to protect the rights of the Holder against impairment. Without limiting the
generality of the foregoing, the Company (i) will not increase the par value of
any Warrant Shares above the amount payable therefor on such exercise, (ii) will
take all such action as may be reasonably necessary or appropriate in order that
the Company may validly and legally issue fully paid and nonassessable Warrant
Shares on the exercise of this Warrant, and (iii) will not close its shareholder
books or records in any manner which interferes with the timely exercise of this
Warrant.


                                       10

            (c) GOVERNING LAW; VENUE; WAIVER OF JURY TRIAL. THE CORPORATE LAWS
OF THE STATE OF DELAWARE SHALL GOVERN ALL ISSUES CONCERNING THE RELATIVE RIGHTS
OF THE COMPANY AND ITS STOCKHOLDERS. ALL QUESTIONS CONCERNING THE CONSTRUCTION,
VALIDITY, ENFORCEMENT AND INTERPRETATION OF THIS WARRANT SHALL BE GOVERNED BY
AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.
EACH PARTY HEREBY IRREVOCABLY SUBMITS TO THE EXCLUSIVE JURISDICTION OF THE STATE
AND FEDERAL COURTS SITTING IN THE CITY OF NEW YORK, BOROUGH OF MANHATTAN, FOR
THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION HEREWITH OR WITH ANY
TRANSACTION CONTEMPLATED HEREBY OR DISCUSSED HEREIN (INCLUDING WITH RESPECT TO
THE ENFORCEMENT OF ANY OF THE TRANSACTION DOCUMENTS), AND HEREBY IRREVOCABLY
WAIVES, AND AGREES NOT TO ASSERT IN ANY SUIT, ACTION OR PROCEEDING, ANY CLAIM
THAT IT IS NOT PERSONALLY SUBJECT TO THE JURISDICTION OF ANY SUCH COURT, THAT
SUCH SUIT, ACTION OR PROCEEDING IS IMPROPER. EACH PARTY HEREBY IRREVOCABLY
WAIVES PERSONAL SERVICE OF PROCESS AND CONSENTS TO PROCESS BEING SERVED IN ANY
SUCH SUIT, ACTION OR PROCEEDING BY MAILING A COPY THEREOF VIA REGISTERED OR
CERTIFIED MAIL OR OVERNIGHT DELIVERY (WITH EVIDENCE OF DELIVERY) TO SUCH PARTY
AT THE ADDRESS IN EFFECT FOR NOTICES TO IT UNDER THIS AGREEMENT AND AGREES THAT
SUCH SERVICE SHALL CONSTITUTE GOOD AND SUFFICIENT SERVICE OF PROCESS AND NOTICE
THEREOF. NOTHING CONTAINED HEREIN SHALL BE DEEMED TO LIMIT IN ANY WAY ANY RIGHT
TO SERVE PROCESS IN ANY MANNER PERMITTED BY LAW. THE COMPANY HEREBY WAIVES ALL
RIGHTS TO A TRIAL BY JURY.

            (d) The headings herein are for convenience only, do not constitute
a part of this Warrant and shall not be deemed to limit or affect any of the
provisions hereof.

            (e) In case any one or more of the provisions of this Warrant shall
be invalid or unenforceable in any respect, the validity and enforceability of
the remaining terms and provisions of this Warrant shall not in any way be
affected or impaired thereby and the parties will attempt in good faith to agree
upon a valid and enforceable provision which shall be a commercially reasonable
substitute therefor, and upon so agreeing, shall incorporate such substitute
provision in this Warrant.


                                       11

      IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed by its authorized officer as of the date first indicated above.

                                            ASPEN TECHNOLOGY, INC.


                                            By:_________________________________
                                            Name:_______________________________
                                            Title:______________________________


                                       12

                             FORM OF EXERCISE NOTICE

(To be executed by the Holder to exercise the right to purchase shares of Common
Stock under the foregoing Warrant)

To: Aspen Technology, Inc.

The undersigned is the Holder of Warrant No. _______ (the "WARRANT") issued by
Aspen Technology, Inc., a Delaware corporation (the "COMPANY"). Capitalized
terms used herein and not otherwise defined have the respective meanings set
forth in the Warrant.

1.    The Warrant is currently exercisable to purchase a total of ______________
      Warrant Shares.

2.    The undersigned Holder hereby exercises its right to purchase
      _________________ Warrant Shares pursuant to the Warrant.

3.    The Holder intends that payment of the Exercise Price shall be made as
      (check one):

                        ____ "Cash Exercise" under Section 9(a)

                        ____ "Cashless Exercise" under Section 9(b)

4.    If the holder has elected a Cash Exercise, the holder shall pay the sum of
      $____________ to the Company in accordance with the terms of the Warrant.

5.    Pursuant to this exercise, the Company shall deliver to the holder
      _______________ Warrant Shares in accordance with the terms of the
      Warrant.

6.    Following this exercise, the Warrant shall be exercisable to purchase a
      total of ______________ Warrant Shares.

Dated: _________________, ______         Name of Holder:

                                         (Print)_____________________________


                                         By:_________________________________
                                         Name:_______________________________
                                         Title:______________________________

                                         (Signature must conform in all respects
                                         to name of holder as specified on the
                                         face of the Warrant)

                               FORM OF ASSIGNMENT

      [To be completed and signed only upon transfer of Warrant]

      FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto ________________________________ the right represented by the within
Warrant to purchase ____________ shares of Common Stock of Aspen Technology,
Inc. to which the within Warrant relates and appoints ________________ attorney
to transfer said right on the books of Aspen Technology, Inc. with full power of
substitution in the premises.

Dated: _________________, ______


                                         _______________________________________
                                         (Signature must conform in all respects
                                         to name of holder as specified on the
                                         face of the Warrant)

                                         _______________________________________
                                         Address of Transferee

                                         _______________________________________

                                         _______________________________________

In the presence of:

_________________________


                                                                    EXHIBIT 99.8

                            AMENDMENT AGREEMENT NO. 4
                               TO CREDIT AGREEMENT


      This AMENDMENT AGREEMENT NO. 4 (this "Amendment"), made effective as of
March 19, 2002, by and between ASPEN TECHNOLOGY, a Delaware corporation
("Borrower") and FLEET NATIONAL BANK, a national banking association (the
"Bank"), amends the Credit Agreement dated as of October 27, 2000, as amended as
of June 29, 2001, November 2, 2001 and February 6, 2002 (as the same may be
further amended, modified, or supplemented from time to time, the "Credit
Agreement"), by and between the Borrower and the Bank. Capitalized terms used
but not defined herein shall have the meanings set forth for such terms in the
Credit Agreement.

      WHEREAS, the Borrower has requested that the Bank agree to amend the
Credit Agreement in certain respects; and

      WHEREAS, subject to the terms and provisions hereof, the Bank is willing
to do so;

      NOW, THEREFORE, the parties hereto hereby agree as follows:

      1. Amendment to Credit Agreement. The definition of "Permitted Restricted
Payments" set forth in Section 1.1 of the Credit Agreement is hereby deleted in
its entirety and replaced with the following:

            "Permitted Restricted Payments" shall mean any dividend,
      distribution or other payment, or any purchase, redemption or other
      acquisition for value of capital stock of the Borrower, pursuant to (i)
      Section 3, 9 or 10 of the Certificate of Designations of Series B-I
      Convertible Preferred Stock and Series B-II Convertible Preferred Stock
      (as amended from time to time, the "Series B Certificate") forming part of
      the Certificate of Incorporation, as amended, of the Borrower, (ii)
      Section 4.5, 4.9, 4.10, 4.11 or 6.2 of the Amended and Restated Securities
      Purchase Agreement, dated as of even date herewith, by and between the
      Borrower and the entities listed on the signature pages thereto (as
      amended from time to time, the "Purchase Agreement"), (iii) Section 6 or
      10(c) of the warrants to purchase common stock (the "Warrants") issued by
      the Borrower pursuant to the Purchase Agreement (or any warrant issued
      upon the transfer thereof, in connection with a partial exercise thereof
      or otherwise as contemplated thereby), (iv) Section 2(e), 2(g), 4 or 5 of
      the Amended and Restated Registration Rights Agreement, dated of even date
      herewith, by and between the Borrower and the entities listed on the
      signature pages thereto (as amended from time to time, the "Rights
      Agreement") and (v) Section 3 or 7 of the Certificate of Designations of
      Series C Preferred Stock (as amended from time to time, the "Series C
      Certificate").

      2. Representations and Warranties. The Borrower hereby confirms (a) that
the representations of the Borrower contained in Section 4 of the Credit
Agreement are true and correct on and as of the date hereof as if made on the
date hereof, treating this Amendment, the

Credit Agreement as amended hereby, and the other Loan Document as amended
hereby, as "Loan Documents" for the purposes of making said representations; and
(b) after giving effect to this Amendment, no Default or Event of Default has
occurred and is continuing under the Credit Agreement.

      3. Delivery of Documents. Promptly following the date hereof, the Borrower
shall provide to the Bank final definitive copies of the following documents,
bearing signatures where appropriate: (a) the Purchase Agreement, (b) the Series
B Certificate, (c) the Warrants, (d) the Rights Agreement and (e) the Series C
Certificate.

      4. Miscellaneous Provisions. Except as otherwise expressly provided by
this Amendment, all of the terms, conditions and provisions of the Credit
Agreement and the other Loan Documents shall remain in full force and effect.
The parties hereto hereby acknowledge and agree that all references to the
Credit Agreement contained in any of the Loan Documents shall be references to
the Credit Agreement as amended hereby and as the same has been or may be
amended, modified, supplemented, or restated from time to time. This Amendment
may be executed in any number of counterparts, but all such counterparts shall
together constitute but one instrument. In making proof of this Amendment it
shall not be necessary to produce or account for more than one counterpart
signed by each party hereto by and against which enforcement hereof is sought.
The Borrower hereby confirms its obligations to pay promptly upon request all
reasonable out-of-pocket costs and expenses incurred or sustained by the Bank in
connection with this Amendment, including the reasonable fees and expenses of
Sullivan & Worcester LLP.

      5. Governing Law. This Amendment shall be construed according to and
governed by the internal laws of The Commonwealth of Massachusetts without
reference to principles of conflicts of law.

      IN WITNESS WHEREOF, the parties hereto have executed this Amendment as a
sealed instrument as of the date first above written.

                                    ASPEN TECHNOLOGY, INC.

                                    By: /s/ Lisa W. Zappala
                                       -----------------------------------------
                                         Name: Lisa W. Zappala
                                         Title: Senior Vice President and
                                                Chief Financial Officer


                                    FLEET NATIONAL BANK

                                    By: /s/ Larisa B Chilton
                                       -----------------------------------------
                                         Name:      Larisa B. Chilton
                                         Title:     Vice President


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