DASSAULT SYSTEMES Schedules Third Quarter 2006 Conference Call Webcast for October 26, 2006

Dassault Systèmes (DS) (NASDAQ:DASTY)(Paris:DSY), a world leader in 3D and Product Lifecycle Management (PLM) solutions, will host a conference call on Thursday, October 26, 2006, to discuss its operating performance for the third quarter 2006 ended September 31, 2006. The management of Dassault Systèmes will host the conference call at 9:00 AM New York Time – 3:00 PM Paris Time to discuss the Company’s operating performance. The conference call will be available via the Internet by accessing Dassault Systèmes’ website at http://www.3ds.com/corporate/investors/. Follow the directions on the main page to link to the audio. Please go to the website at least fifteen minutes prior to the call to register, to download and install any necessary audio software. The webcast will be archived for 30 days. About Dassault Systèmes As a world leader in 3D and Product Lifecycle Management (PLM) solutions, the Dassault Systèmes group 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.