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For immediate release: May 28, 2009

MDA provides more major U.S. property insurance carriers with validated property information

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that over the past several months, five major U.S. homeowners insurance carriers have entered into an agreement with MDA’s U.S. subsidiary Marshall & Swift/Boeckh (MSB), to integrate MSB’s InterChange™ database into its policy valuation quoting system for improved point-of-sale processing.

Launched in 2006, InterChange draws on MDA’s combined suite of property information sources in the U.S. and currently holds validated records on nearly half the single-family homes across the U.S., with new property information incorporated as it becomes available. Through proprietary screening, scoring, and amalgamation techniques, aggregated single-family home characteristics data is validated for use by property insurers. Data validation allows homeowners insurers to more accurately determine insurable values and premiums, which improves and streamlines the acquisition of new home insurance policies.

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 information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 3,200 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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