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For immediate release: May 25, 2006

MDA Acquires Legal Search Firm In Northern Ireland

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today the acquisition of Lyttle & Co. in Belfast, Northern Ireland. Lyttle & Co. was established in 1984 and provides all forms of property related search information to the legal and financial sector. This acquisition complements MDA’s recently announced acquisition of the Rochford Brady Group in the Republic of Ireland.

Lyttle & Co. will continue to operate as a separate business reporting into the Rochford Brady Group, headed by Philip Grant. The company’s prior owner, Raymond Lyttle, will continue to be involved in the management of the company.

Daniel Friedmann, MDA President and CEO said: “the acquisition of Lyttle & Co. represents the next step in our strategy to be a leading supplier in the property and legal information markets throughout all of the British Isles.”

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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