Facilitating property calculation within the product and process lifecycle Valentijn de Leeuw STS Associ s, Evry, Franc

1. Facilitating property calculation within the product and process lifecycleValentijn de LeeuwSTS Associ�s, Evry, France

2. Summary Property calculation has an important impact on validity and accuracy of product and process design Cost of accuracy can be high Matter is not to reduce cost, but value received through: Best practices Enterprise-wide roll-out of software tools Standardization Right attitude Organisational optimisation Mainly Research Development and Engineering Operational and Strategic componenent (Well-)managed Process/product lifecycle management Manage all innovation and strategic planning in an integrated manner

3. Product and process lifecycle Innovation has different emphasis depending on industry drivers Commodities: focus mainly on process improvement Specialities/Pharma: focus on product performance and introduction Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

4. S95 MES functions

5. R&D / Engineering and ERP with S95 MES functions

6. R&D / Engineering-related applications

7. Different activities have widely varying requirements for property calculations Product design Molecular property screening Chemistry screening Process synthesis / strategic planning Solvent screening Unit ops / conditions screening Process design FEL and detail design Plant support / Maintenance Robust estimation methods Accurate trends Accuracy hierarchy Highly accurate for main and contaminants Medium accurate for intermediate, non-contaminants Low accuracy for unimportant traces Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

8. �Right� precision for �right� application Precision has a cost. For efficiency precision must not exceed the requirements For screening purposes, robust estimation methods are sufficient, BUT Methods depending on component classes can be ambiguous and/or require additional classification (e.g. Vetere methods) GC can be quite accurate but GC methods can may have missing group contributions that cause results to vary widely in precision (Van Krevelen, UNIFAC, etc.) Molecular simulation maybe too costly Segment NRTL method (unpublished, AspenTech), may have the required intermediate precision level combined with simplicity and small number of known parameters. Other possible enhancements Molecular simulation to fill in gaps in GC parameters (Pricl work for van Krevelen) Automate component classification using segment approach? Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

9. �Right� precision for �right� application For design, operations, detail engineering, planning and maintenance purposes high accuracy is required at low cost Main components and critical pollutants of the mixture must be correlated against measurements with suitable correlative models 2a. For secundary compenents and in case members of a family are studied, the determination of a limited number of GC parameters and GC interactions from representative data can provide accurate estimation for the full family. 2b. For calculation of properties of mixtures of main and secundary components, parameters of secundary components for the correlation model, can be obtained by estimation/translation (e.g. UNIFAC-NRTL). For unimportant and/or traces the procedure 2b. is sufficient without custom GC parameters. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

10. Technical or individual versus enterprise performance Technical excellence and efficiency is necessary but not sufficient In order to deliver benefits, systems / technologies need to be used consistently Additional efficiency must be gained from efficient organization and work practices Organisation and work practice can be designed on theoretical basis, BUT Homogeneous work practices require trade-offs for individuals Team work required (no US and THEM) Human aspects must be taken into account in order to ensure team work and usage of concepts and processes Listen to understand needs and concerns Leverage knowledge and competence of operational levels Create trust by consistent follow-up on action plans Foster sense for collective responsibility through team work

11. Standardization and knowledge management Total cost of ownership (TCO) of software is proportional to The number of vendors (versions, data entry and maintenance, training, license cost, comparison of results) The number of applications versus parameterized runs users make (development versus usage of environment) For maximum efficiency Single vendor Single data entry and 1 central data (package) maintenance Open standards / integration integration among data, theory and calculation providers, integration with synthesis / simulation packages) Benefits Reduced maintenance cost Consistent results Reduced training needs Increased employee mobility within the enterprise Knowledge repository / knowledge management (cost of data availability) Trade-offs Give up �own� tools Give up some flexibility Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

12. Example property calculation: Critical elements: theory, data, calculation Theory sources Industry �Providers� Universities Calculation / simulation sources Industry (�inhouse�) Property calculation Providers DDBST InfoChem, AspenTech, SimSci � Simulation and property calculation providers AspenTech SimSci, � Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

13. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

14. Performance and management of innovation Beyond the individual efficiency, organisational efficiency can be reached Trends in organisation of innovation to improve performance Sequential workflow from department to department Concurrent and collaborative development / engineering Data / recipe / process sharing across boundaries and/or enterprises Early involvement with next stakeholder, better decisions earlier Team work stimulates creativity and perception of well-being Impact on productivity, cost and management efficiency Recent organisation forms (by project or technology) More concurrency Need to secure functional coherence and support Innovation management needs in addition to take the following components into account: Has been proven to be manageable and repeatable process Concurrency and interaction with strategic process (portfolio mgt) desirable Management of competencies and know-how Generation of ideas Capacity of evaluation (half time of alternatives) Delivery of building blocks / molecules / technologies for development Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

15. Strategic component of innovation The enterprise needs to manage its strategic processes well, and take existing calculation methods into account for optimum accuracy Development: Balance of in-house activity development and subcontracting Development know-how portfolio management Strategic know-how must be in-house, Protection Acquisition versus collaboration or alliance (private versus share), also consider spin-off Outsource non-core activities to reliable third parties (providers) Project portfolio management, Research separate from Development Product portfolio management Continuous strategy updates Production: Investment / continuation / divestment studies Long-term cost-benefit and risk analysis Assets, Logistics, Client bases Process portfolio management Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation. Chemical product and process innovations drive the growth of the chemical industry. AspenTech�s chemical industrial applications products, as part of Aspen Engineering Suite, help drive chemical product and process innovations. Specifically, we provide enterprise-wide chemical engineering science software solutions in support of chemists and chemical engineers in their pursuit of chemical product and process innovations, whether in R&D, conceptual design, process engineering, detailed engineering, construction and startup, or operations and maintenance, etc. Our software solutions capture and advance 1st Principles chemical engineering science models and data for physical properties, reaction engineering, and their industrial applications. These 1st Principles models were derived from theoretical advances, experimental results, and molecular simulation.

16. PLM Integral management of innovation, strategic planning and project management is important to reach a global optimum for the enterprise. To reach a global optimimum, technical, social, organisational, economical and environmental impacts should be balanced. In all these components property calculation and any other engineering discipline should have its place and add to the performance of each activity. The global deployment of knowledge present in local areas is a tremendous potential for benefit. The subprocesses should be performing and efficient More information: STS Associ�s, Evry, France Valentijn de Leeuw +33 (1) 60 79 38 81 Mobile: +33 (6) 89 68 43 59 AspenTech Consultant EMEA, Cambridge, UK: Robert Furber +44 (1223) 819 750 Mobile: + 44 (0) 7785 227511

17. Supporting slides

18. STS consulting services STS is a small consulting company in France, which is networked with companies of the same name in Canada and in the USA. STS is active all over Europe and the rest of the world with consultants with international experience, in re designing business processes and facilitating change, and has specialized in the area of : Increasing and managing performance, in particular of R&D and innovation, by applying project oriented organisation forms, Deploying strategy, Implementing collaborative processes and solutions in innovation intensive industries like electronics (Alcatel), telecom (France Telecom), automotive (Valeo), aerospace (Airbus), life sciences (GSK, Merial), and fine chemicals. STS does not implement software, but helps defining processes including the use of software, as well as facilitating change catalyzed by software solutions.

19. STS consulting services The approach is original in that it implies all players in the organisation, by which organisational support and buy-in is ensured. Consulting know-how is transferred to the client in order to ensure sustained performance and increased agility in responding to changing circumstances and pressures. The change is conceived at strategic level and consistently implemented at the operational levels of all businesses or sites concerned. At the operational levels, the implementations is very much customized and can take the form of a mix of consulting and training, which can have components of project management, cost control, team working, knowledge management etc. Economic impact of the approach can be estimated using business case techniques and audited after implementation, social and environmental cost and benefits are taken into account.

20. AspenTech offering Engine for thermodynamic/physical property calculations across all engineering applications One enterprise-wide consistent thermo engine Two main offerings Aspen Properties (AP) and HYPROPIII (HP) Our vision is to expand the offering to become a single common platform for knowledge management of process/product materials, including physical properties and other critical information (such as data management)

21. Elements of the Offering Software Aspen Properties includes Excel add-in, Web interface and Desktop interface HYPROPIII includes COMThermo and a Development Kit Training We offer courses and workshops to address both Thermodynamics and the use of the software packages Services Examples of services include: Implementation of in-house methods and data under the desired platform Consulting in the tailoring and development of high fidelity thermophysical models

22. Value Proposition Rigorous Thermo-physical Property Calculations for the Process Industries � Industry Gold Standard Consistent Physical Properties Results across the Product/Process Lifecycle � Lifecycle Platform Proven Models, Data and Industrial Applications

24. Chemical Product and Process Development

25. Improving Engineering Quality & Efficiency To support business decisions, BP Chemicals needs the consistent use of physical property packages that are validated for our processes throughout the organization. These packages, as well as physical properties in general, must be easily accessible to all our technologists for use within their applications, including Excel spreadsheets. We have found Aspen Properties to be the easiest to use property calculation system available within Excel� Malcolm WoodmanEngineering Technology Manager, Process Simulation BP Chemicals News Releases Aspen Engineering Suite(TM) Embraces the Internet Era and Revolutionizes Innovation and Engineering Workflow AspenTech product suite for process engineering and design acceleratesworkflow, reduces costs and increases knowledge sharing and management CAMBRIDGE, Mass., May 1 /PRNewswire/ -- Aspen Technology, Inc.(Nasdaq: AZPN), the leading supplier of manufacturing enterprise optimizationand extended supply chain solutions for the process industries, todayannounced its new release of the Aspen Engineering Suite (AES). The suiteleverages the Internet to accelerate and optimize business performancethroughout process manufacturers' innovation and engineering lifecycles. AESencompasses the entire engineering workflow process including conceptualdesign, process engineering, detailed engineering, start-up and plantoperations. It integrates with outside sources through common standards, suchas pdXi, CAPE-OPEN, OPC, Microsoft Excel and XML. In addition, the suiteincludes new products such as Aspen Properties(TM) for consistent use ofphysical properties and Aspen WebModels(TM) for model-based business decisionsover the Internet. "With this significant step forward in AES, we will be able to furthermaximize client value," said Ashish A. Shah, Director, Automation, ProcessTechnology, Fluor Daniel who is responsible for corporate-wide implementationof FrontRunner(SM), an Aspen Zyqad(TM) based solution. "AES workflow andstandards support will enable us to make a quantum leap in our MasterPlant(SM)tool FrontRunner(SM) engineering automation initiative. We value inparticular, significant workflow enhancements within Aspen Plus(R) and withinthe Aspen Zyqad engineering system as well as the ability to re-useengineering knowledge between process engineering, carried out within AspenPlus and Aspen Zyqad." "To support business decisions, BP Amoco Chemicals needs the consistentuse of physical property packages that are validated for our processesthroughout the organization," said Malcolm Woodman, Engineering TechnologyManager, Process Simulation, BP Amoco Chemicals. "These packages, as well asphysical properties in general, must be easily accessible to all ourtechnologists for use within their applications, including Excel spreadsheets.We have found Aspen Properties to be the easiest to use property calculationsystem available within Excel. We also get the consistency we require with ourprocess simulation tools since Aspen Properties is part of AES."AES enables e-business and integrates the workflow processes within andbetween plant operation, engineering, vendors and partners. Vendors are ableto make equipment models available to engineering, contractors, and operatingcompanies who use the models in their projects to increase quality and speedof decision making. AES also supports collaborative work through structuredtemplates that enable process knowledge capture in the form of pre-engineeredplant sections and through an intuitive hierarchical environment. Thisfeature allows knowledge re-use and sharing between engineers and projectteams using Aspen Plus. "To truly optimize plants and enterprises, process manufacturers musteliminate lost time due to data re-entry and create synergy among theirconsultants and partners," said Larry Evans, CEO and Chairman of AspenTech."AES's Internet-enabled products expand our potential user base by makingadvanced plant models and property models more accessible throughout anenterprise. Customers are able to achieve additional benefits by sharingknowledge between programs and outside sources." The expert knowledge of plant equipment captured within Aspen CustomModeler(TM) can be reused directly by process engineers within Aspen Plus tobest optimize new designs or revamps and to maximize plant profitability.Best-in-class engineering technologies within AES enable companies tosignificantly minimize operating cost, to increase plant safety and to reducetime-to-benefits. For example, dynamic optimization of batch processessignificantly reduces operating costs. In addition, engineers can capitalizeon models developed in Polymers Plus(R) within Aspen Plus by directlyconducting required plant operability and safety studies within AspenDynamics(TM). Aspen Engineering Suite, Aspen eSupply Chain Suite(TM) and AspenManufacturing Suite(TM) are built on the Aspen Framework and compriseAspenTech's innovative Enterprise Optimization and Plantelligence solutionswhich provide process manufacturers with a fully integrated enterpriseoptimization solution from the plant floor through the entire value chain. New Products Available in the Aspen Engineering SuiteDeep process knowledge, captured within plant and physical propertymodels, can now be easily and securely accessed and used through the Internetfor decision-making by professionals throughout the company or by selectedpartners and licensors. Aspen Properties -- enables operators and engineers to access the physicalproperties and data developed and used within AES from the Internet withMicrosoft Internet Explorer or as property functions within any MicrosoftExcel engineering application. Aspen WebModels -- enables the easy and fast creation of a MicrosoftInternet Explorer front end for a pre-configured Aspen Plus model. The fullAspen Plus model is maintained on a server with restricted access while theMicrosoft Internet Explorer end user has secure access to pre-selected modelinput and output variables. Aspen WebModels is entirely XML-based. Itleverages the Aspen Framework role based security and uses an n-Tierarchitecture to enable the most cost-effective use of available computingcapabilities. About AspenTechAspen Technology, Inc. is the leading supplier of integrated software andsolutions that enable process manufacturers to automate and optimize theirplants and extended supply chains, while enabling e-business. With deepprocess knowledge, best-in-class technology, and strategic alliances withleading business and technology partners, AspenTech offers the industry'sbroadest family of scaleable solutions, allowing process manufacturers toachieve competitive advantage in the Internet economy. AspenTech'sPlantelligence(TM) solutions automate and optimize critical business processesat the plant level. AspenTech's Enterprise Optimization(TM) solutions extendthe scope of optimization across the enterprise and extended supply chain.AspenTech eSupply Chain solutions enable manufacturers to link seamlessly tocustomers, suppliers and on-line trading exchanges, creating a collaborative,flexible extended enterprise. AspenTech employs more than 1,500 peopleworldwide. For more information, visit http://www.aspentech.com. This news release contains forward-looking statements regarding futureevents or financial performance of AspenTech that involve risks anduncertainties. Certain risks and uncertainties are discussed in the RiskFactors section of our Form 10K for the year ended June 30, 1999, whichfactors are incorporated herein by reference. Copies of this document areavailable on request from the Investor Relations Department of AspenTech.AspenTech, Enterprise Optimization, Plantelligence, Aspen EngineeringSuite, Aspen Manufacturing Suite, Aspen eSupplyChain Suite, Aspen CustomModeler, Aspen Dynamics, Aspen Plus, Aspen Properties, Aspen WebModels, AspenZyqad, and the aspen leaf logo are trademarks or registered trademarks ofAspen Technology, Inc., Cambridge, Mass. For Media:Gina CeramiAspen Technology, Inc.(908) 790-7330gina.cerami@aspentech.com Steve DanehySchwartz Communications, Inc.(781) 684-0770steved@schwartz-pr.com For Investors:Joshua YoungAspen Technology, Inc.(617) 949-1274joshua.young@aspentech.com SOURCE Aspen Technology, Inc. Web site: http://www.aspentech.com CONTACT: For Media: Gina Cerami of Aspen Technology, Inc.,908-790-7330, gina.cerami@aspentech.com or Steve Danehy ofSchwartz Communications, Inc., 781-684-0770, steved@schwartz-pr.com or For Investors: Joshua Young of AspenTechnology, Inc., 617-949-1274, joshua.young@aspentech.com News Releases