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For immediate release: November 20, 2006

MDA's Valuation Information To Assist New York State Property Assessments

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that its subsidiary Marshall & Swift/Boeckh (MSB) has won a US$970,000 5-year contract from the New York State Office of Real Property Services (NYORPS) to upgrade their building cost information for the State's 57 counties. Assessors across the State use this information as one of the tools in the process of determining property values for taxation purposes.

This contract is part of the State of New York's initiative to apply industry's best practices to the property valuation process and support local governments in their pursuit of real property tax equity. James Dunne, Research Director of NYORPS stated: "By working at the State level with an industry leader in the cost valuation field, the assessment community will see tremendous savings and improved quality over what localities could purchase individually".

Peter Wells, President of MSB said, "This is an important state-wide contract won by the Government Services business unit of MSB. We look forward to working with the Office of Real Property Services in serving the local governments and taxpayers of New York State."

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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