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For immediate release: June 27, 2006

MDA To Provide Critical Part Of Information Solution For Japanese Space Program

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it has received an Authorization To Proceed (ATP) from Mitsubishi Electric Corporation of Japan to start work on the expected CAD $15.4M contract to provide six critical elements of the real-time information solution which controls the precise maneuvering as Japan's unmanned H-II Transfer Vehicle (HTV) docks with the International Space Station.

The functionality provided by MDA incorporates unique features for observing and controlling the rate of movement of the spacecraft to ensure safe maneuvering as the HTV approaches the Space Station. The HTV will be used to transfer the Japanese Experimental Module (JEM) and other supplies to the Space Station. The use of unmanned transfer vehicles is also being planned by NASA for future Space Station supply missions when the shuttle fleet is retired.

This is a significant contract for MDA's MontrĂ½al operation, which was acquired from EMS last year. The award further affirms MDA's unique capabilities in providing multiple components of the information solution required for close proximity maneuvering of spacecraft - a key element in future space exploration missions and in-orbit spacecraft servicing applications.

About 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 3,000 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.

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Forward-Looking Statements

This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. with respect to future events and financial performance. Any such forward-looking statements are subject to risks and uncertainties and MDA's actual results of operations could differ materially from historical results or current expectations. Additional information on these and other potential factors that could affect MDA's financial results are detailed in documents filed from time to time with the applicable Canadian securities regulatory authorities.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of this release.

For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743

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