Dassault Systèmes Announces Principal Sponsorship of 2007 NAFEMS World Congress

SIMULIA to present five papers on realistic simulation at international analysis and simulation conference

Paris, France, and Providence, R.I., USA, April 13, 2007 — Dassault Systèmes (DS) (NASDAQ: DASTY; Euronext Paris: #13065, DSY.PA), a world leader in 3D and Product Lifecycle Management (PLM) solutions, announces that its SIMULIA brand for realistic simulation is the principal sponsor of the 11th NAFEMS World Congress on simulation technology, to be held May 22-25, 2007, in Vancouver, Canada. This year’s Congress features workshops, training classes, roundtables and more than 130 presentations on analysis and simulation technologies.

SIMULIA is sponsoring the congress to showcase its leadership in advancing realistic simulation methods and technology. SIMULIA has authored or co-authored five papers that will be presented during the international conference and will also present in three associated workshops.

Papers to be presented at the NAFEMS Congress include:

• The System Level Integrity Study of the Jaguar S-Type Rear Suspension Using an Integrated FEA and MBS Technique, co-authored with Jaguar/Land Rover LTD
• Accurate and Efficient Modeling of Point and Surface Engineering Connections
• Building Blast Simulation, co-authored with University of Florida
• Coupling FEA to CFD to Investigate the Effects of Pulsatile Blood Flow on the Dilatation of Artery Walls, co-authored with W.L. Gore & Associates
• New Capabilities for Composite Fracture Analysis, authored in cooperation with ATA Engineering Inc

The three workshops in which SIMULIA will participate will cover areas of multiphysics solutions, open multidisciplinary interfaces, and flexible-body mechanism simulation. The SIMULIA team will also demonstrate their solutions at in the conference exhibition hall.

More information about the NAFEMS World Congress is available at http://www.nafems.org/congress.

About SIMULIA
SIMULIA is the Dassault Systèmes brand that delivers an open platform for multiphysics analysis as well as a scalable portfolio of realistic simulation solutions including ABAQUS and the CATIA Analysis applications. By building on established technology, respected quality, and superior service, SIMULIA makes realistic simulation an integral business practice that improves product performance, eliminates physical prototypes, and drives innovation. Headquartered in Providence, RI, USA, with R&D centers in Providence and in Suresnes, France, the SIMULIA brand provides sales, services, and support through a global network of regional offices and distributors. http://www.simulia.com

About Dassault Systèmes
As a world leader in 3D and Product Lifecycle Management (PLM) solutions, Dassault Systèmes brings value to more than 90,000 customers in 80 countries. A pioneer in the 3D software market since 1981, Dassault Systèmes develops and markets PLM application software and services that support industrial processes and provide a 3D vision of the entire lifecycle of products from conception to maintenance. The Dassault Systèmes portfolio consists of CATIA for designing the virtual product - SolidWorks for 3D mechanical design - DELMIA for virtual production - SIMULIA for virtual testing and ENOVIA for global collaborative lifecycle management, including ENOVIA VPLM, ENOVIA MatrixOne and ENOVIA SmarTeam. Dassault Systèmes is listed on the Nasdaq (DASTY) and Euronext Paris (#13065, DSY.PA) stock exchanges. For more information, visit: http://www.3ds.com

CATIA, DELMIA, ENOVIA, SIMULIA and SolidWorks are registered trademarks of Dassault Systèmes or its subsidiaries in the US and/or other countries.

Dassault Systèmes Press Contacts:

Tim Webb (SIMULIA), +1 (401) 276-8105
Tim.Webb@simulia.com

Mikiko Igarashi (AP), +81 3-5442-4138
mikiko_igarashi@ds-jp.com

Derek Lane (Americas), +1 (818) 673-2243
derek_lane@ds-us.com

Arnaud Malherbe (EMEA), +33 1 55 49 87 73
arnaud_malherbe@ds-fr.com