For immediate release: August 31, 2005

MDA to Develop Safe Landing Information Solution for Boeing

Richmond, B.C. - MacDONALD, DETTWILER AND ASSOCIATES LTD. (TSX:MDA ), a provider of essential information solutions, announced today that it has received a contract from The Boeing Company to develop a spacecraft landing information solution for NASA's future missions to the moon and Mars. The precision landing and hazard avoidance work is to develop a demonstration as part of NASA's Human and Robotic Technology program. A successful demonstration will pave the way for MDA'' solution to be integrated into future Boeing plans for NASA planetary exploration missions.

This demonstration is designed to show that future NASA crewed and unmanned spacecraft would be able to safely land in areas of great interest that have rocky, dangerous terrain. MDA will integrate its real-time terrain surveillance, analysis, and safe landing site selection capabilities with Boeing's solutions to provide autonomous navigation and hazard avoidance capabilities that do not currently exist.

About MacDONALD, DETTWILER AND ASSOCIATES LTD. (MDA)

MDA provides advanced information solutions that capture and process vast amounts of data, produce essential information, and improve the decision making and operational performance of business and government organizations worldwide.

Focused on markets and customers with strong repeat business potential, MDA delivers a broad spectrum of earth and space based information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 2,500 people in locations across the United States, the United Kingdom, and Canada. The Company's common shares trade on the Toronto Stock Exchange under the symbol TSX:MDA.

Related Websites:
www.mdacorporation.com
www.boeing.com