QVF Engineering Extends Commitment to AspenTech's Process Modeling Solutions; Leading global supplier of borosilicate glass process plant and plant equipment signs new agreement for simulation and optimization solutions

March 2, 2006

CAMBRIDGE, Mass.--(BUSINESS WIRE)--March 2, 2006--Aspen Technology, Inc. (NASDAQ: AZPN), a leading provider of software and services to the process industries, today announced that QVF Engineering, a major global supplier of borosilicate glass process plant and plant equipment, has signed a new multi-year license agreement for a range of aspenONE(TM) process modeling solutions. QVF will use the simulation and optimization solutions at its two engineering centers in Germany and the UK to optimize the design and performance of process plants for its customers in the chemical and pharmaceutical industries.

QVF delivers a range of engineering services over the plant lifecycle, including full process-optimized plant concepts utilizing the company's own equipment and third-party products. The company has standardized on AspenTech's process modeling solutions to simulate and optimize the plant processes, from initial concept design and engineering through to plant operations. The solutions help to ensure optimum process performance and maximum return on investment for QVF's customers.

"AspenTech's modeling solutions have become an integral part of our process development workflow," said Dr. Frank Dorstewitz, Chemical Engineering Manager, QVF Engineering. "The solutions enable our engineers to identify the best plant concept for our customers, and to ensure that we provide an optimized system that delivers high productivity together with excellent quality."

The new agreement builds on a five year relationship between QVF and AspenTech. The key applications licensed by the company include the Aspen Plus(R) process simulation environment, plus specialized products for the design and optimization of distillation processes and shell & tube heat exchangers.

"We are very pleased to extend our successful partnership with QVF Engineering through this new agreement," said Blair Wheeler, Senior Vice President, AspenTech. "aspenONE process modeling solutions provide companies with an integrated set of tools that can be applied across the full engineering lifecycle. By using consistent models and data, the solutions help companies to maximize return on capital, improve engineering quality and efficiency, and increase operational productivity."

License revenue from this transaction was recognized in AspenTech's fiscal quarter ending December 31, 2005.

About QVF Engineering

QVF Engineering is a leading manufacturer of borosilicate glass plants and glass equipment, with headquarters in Mainz-Mombach (Germany). QVF is part of the De Dietrich Process Systems Gruppe (DDPS), which is a customer-oriented and high-performance provider of process solutions for the chemical, pharmaceutical and associated industries. For more information, visit www.qvf.com.

About AspenTech

Aspen Technology, Inc. provides industry-leading software and professional services that help process companies improve efficiency and profitability by enabling them to model, manage and control their operations. AspenTech's integrated aspenONE(TM) solutions are aligned with the key industry business processes, providing manufacturers the capabilities they need to optimize operational performance, make real-time decisions and synchronize the plant and supply chain. Over 1,500 leading companies already rely on AspenTech's software, including Bayer, BASF, BP, Chevron Corporation, DuPont, ExxonMobil, Fluor, GlaxoSmithKline, Sanofi-Aventis, Shell, and Total. For more information, visit www.aspentech.com.

This press release may contain forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Actual results may vary significantly from AspenTech's expectations based on a number of risks and uncertainties, including, without limitation: AspenTech's plan to improve operational performance may not be implemented effectively; AspenTech has identified material weaknesses in its internal controls with respect to software license revenue recognition and other matters, that, if not remedied effectively, could result in material misstatements; risks around securities litigation and investigations; AspenTech's lengthy sales cycle makes it difficult to predict quarterly operating results; fluctuations in AspenTech's quarterly operating results; AspenTech's dependence on customers in the cyclical chemicals, petrochemicals and petroleum industries; the possibility of new accounting standards or the interpretation of existing accounting standards affecting our financial results; AspenTech's ability to raise additional capital as required; intense competition; AspenTech's need to develop and market products successfully; reliance on relationships with strategic partners; challenges associated with international operations; and other risk factors described from time to time in AspenTech's periodic reports filed with the Securities and Exchange Commission. AspenTech cannot guarantee any future results, levels of activity, performance, or achievements. AspenTech expressly disclaims any current intention to update forward-looking statements after the date of this press release.

AspenTech, aspenONE, Aspen Plus and the aspen leaf logo are trademarks of Aspen Technology, Inc., Cambridge, Mass.

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