MDA Reports First Quarter 2008 Results

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, today reported financial results for the three months ended March 31, 2008.

First quarter net earnings increased to $26 million, or $0.64 per diluted share, on consolidated revenues of $290 million. This is compared to net earnings of $21 million, or $0.49 per diluted share, and consolidated revenues of $306 million for the first quarter of 2007. Results for the current quarter were impacted by the appreciation of the Canadian dollar. Consolidated revenues would have been $316 million and diluted earnings per share would have been $0.70 if the average foreign exchange rates had been comparable to the first quarter last year.

Information Products revenues were $194 million compared to $210 million for the same period a year ago, as a higher level of sales activity this quarter was offset by foreign exchange translation adjustments. Information Systems revenues were $96 million, consistent with the first quarter of 2007.

	Three months ended March 31, 2008	Three months ended March 31, 2007
($ thousands, except per common share amounts)
Consolidated revenues	$ 290,437	$ 306,238
Earnings before income taxes	34,781	29,365
Net earnings	26,086	21,348
Net earnings per diluted common share	0.64	0.49
All results are reported in Canadian dollars and are prepared in accordance with Canadian generally accepted accounting principles.

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 3,000 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.

MDA's First Quarter 2008 unaudited consolidated financial statements are available at:
http://www.mdacorporation.com/investor/financial_reports.shtml

MDA President and CEO Daniel Friedmann and Executive Vice President and CFO
Anil Wirasekara will be available on a Conference Call today, May 12, 2008 at 2:30 p.m. Pacific (5:30 p.m. Eastern) to explain the financial results of the Company and to answer questions.

To participate, dial 1-888-789-9572 in Canada or the United States
In Toronto, dial 416-695-7806
Pass Code: 3260146

The Conference Call will also be Webcast live and archived at:
http://www.mdacorporation.com/investor/events.shtml

Telephone replay will be available until May 19, 2008 at the following numbers:

Toll free, International, dial 1-800-408-3053
In Toronto, dial 416-695-5800
Pass Code: 3260146

Related Websites:
www.mdacorporation.com

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.