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For immediate release: September 20, 2006

MDA Books Largest UK Local Council Modernization Solution To Date

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it will receive CAD $10.5 million over seven years to provide and maintain an information solution to the Bromsgrove District Council.

This program, which will electronically process land information requests coming from the National Land Information Service (NLIS) in England, will be the largest and most comprehensive Local Authority modernization project MDA has carried out to date in England.

Local Authorities that are undergoing, or have undergone, modernization through MDA's NLIS-LAMP program in the U.K. include Slough, Bolton, Liverpool, Telford & Wrekin, South Norfolk, Canterbury, Sandwell, Redcar and Cleveland, and Waveney.

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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