News Release-- December 20, 2005

CSC FINALIZES IT SERVICES EXTENSION AGREEMENT WITH DUPONT

EL SEGUNDO, Calif., Dec. 20 – Computer Sciences Corporation (NYSE: CSC) today announced that, in accordance with the interim agreement previously announced on July 1, it has signed a definitive agreement to extend CSC’s information technology (IT) outsourcing services agreement with DuPont. The new contract extends services through December 2014. CSC now estimates the total value of the seven-year and seven-month extension period at $1.6 to $2 billion depending on fluctuations in business volume and future efficiency gains.

CSC’s relationship with DuPont began in June 1997 when the companies signed a landmark 10-year global IT outsourcing contract. CSC operates DuPont's global information systems and technology infrastructure and provides selected applications services in more than 40 countries throughout the world.

“We are pleased to continue our very successful relationship with DuPont,” said CSC Chairman and Chief Executive Officer Van B. Honeycutt. “Our experience in serving large multinational firms like DuPont enables us to deliver operational results that directly support key business goals.”

Founded in 1959, Computer Sciences Corporation is a leading global IT services company. CSC’s mission is to provide customers in industry and government with solutions crafted to meet their specific challenges and enable them to profit from the advanced use of technology.

With approximately 78,000 employees, CSC provides innovative solutions for customers around the world by applying leading technologies and CSC’s own advanced capabilities. These include systems design and integration; IT and business process outsourcing; applications software development; Web and application hosting; and management consulting. Headquartered in El Segundo, Calif., CSC reported revenue of $14.5 billion for the 12 months ended Sept. 30, 2005. For more information, visit the company’s Web site at www.csc.com.