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For immediate release: April 13, 2006

Provincial Government Awards Imaging Information Solution To MDA

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it has been contracted by the Government of Ontario, through a broad public sector partnership coordinated by the Ontario Ministry of Natural Resources, Land information Ontario project to deliver an information solution consisting of high-resolution satellite imagery of eastern, central and selected areas of northern Canada captured by the QuickBird satellite.

"This information solution represents the largest application of high-resolution satellite imagery we have undertaken in Canada," said John Hornsby of MDA. "Over 120,000 square kilometers of Eastern Canada will be monitored from space at a resolution of 60 centimeters. In other words, we can see individual objects as small as 60cm." Multiple levels in the Provincial and Local Government will use the information extracted from the images for such applications as source-water protection, conservation, land cover classification and detection of changes in the environment.

The solution delivered by MDA will also support emergency planning. By analyzing current imagery, emergency workers can quickly determine the location and progress of damaging fire or flood. This will allow them to provide crucial information to emergency personnel and people in the area. The initial work is valued at over CAD $1.9 million and is expected to provide significant benefits to public sector organizations across the province.

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 2,700 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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