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For immediate release: October 31, 2006

MDA To Provide Advanced Crime Scene Assessment Solution

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it has signed a $1.5M CAD contract with an interdepartmental Canadian Government agency to provide a prototype mobile information solution to assist first response teams at crime and terror sites in assessing threat levels.

As the prime contractor MDA will integrate its Instant Scene Modeler, a sophisticated 3-Dimensional surveillance camera, with a variety of contaminant sensors on a mobile platform, and provide the data processing and fusion to create a real time three dimensional view of the scene overlayed with physical and contaminant measurements. This information is used by first responders who control the mobile solution from a safe distance to assess the scene and associated contaminant threat levels and to plan their course of action. Contaminant sensors include chemical, biological, radiological and nuclear sensors.

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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