News Release-- August 29, 2005

CSC WINS $86 MILLION EPA CONTRACT TO PROVIDE SCIENTIFIC AND TECHNICAL EXPERTISE

Effort Supports Agency’s Mission to Protect Nation’s Water Supplies

EL SEGUNDO, Calif., Aug. 29 - Computer Sciences Corporation (NYSE: CSC) announced today that it has won a contract to provide comprehensive mission support services to the new Water Security Division within the U.S. Environmental Protection Agency’s (EPA) Office of Water. The division was established to address water security and infrastructure protection issues in the wake of the September 11th terrorist attacks. CSC estimates the value of the contract, which has one base year and four one-year options, to be approximately $86 million if all options are exercised.

Under terms of the agreement, CSC will provide scientific, engineering, communications outreach, information technology (IT) and policy support services to assist the newly established security division. Specific responsibilities include planning and training, development and distribution of outreach materials, contaminant research, analytical method development, laboratory network management, engineering support, and security and emergency response improvements at water and wastewater facilities. In addition, CSC will help improve procedures and performance measures for assessing and mitigating the vulnerability of the nation’s water infrastructure.

“The EPA has the responsibility for coordinating and protecting the critical infrastructure for the nation’s water sector,” said Ray Henry, president of CSC’s Civil Systems Development organization. “We are honored to apply our legacy of experience with the agency and deliver the sound results necessary to ensure water resources are secure.”

Among those teaming with CSC are CH2M Hill of Englewood, Colo.; Emergint Technologies of Louisville, Ky; Abt Associates of Cambridge, Mass.; Protection Strategies Inc. of Arlington, Va; Richard Brady & Associates of San Diego, Calif.; the International City/County Management Association of Washington, D.C.; and the Horsley Witten Group of Sandwich, Mass.

About CSC

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 $14.3 billion for the 12 months ended July 1, 2005. For more information, visit the company’s Web site at www.csc.com.