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For immediate release: July 24, 2006

MDA's Second Quarter 2006 Results Conference Call Alert

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, plans to release its Second Quarter 2006 financial results at close of market on Wednesday, July 26, 2006. MDA will host an earnings conference call, featuring remarks by President and CEO, Daniel Friedmann and Anil Wirasekara, Executive Vice-President and CFO, followed by a Q&A session. Included in the conference call will be a discussion of developments with respect to the Home Information Packs. The call is scheduled to begin promptly at 5:30 p.m. Eastern Time (2:30 p.m. Pacific Time). To participate, please call the conference line approximately five minutes prior to the commencement of the call:

Toll free in North America: 1-866-898-9626 In Toronto: 416-340-2216 The conference call will also be Webcast live and then archived at: http://www.mdacorporation.com/corporate/investor/events

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.

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
E-mail: wendy@mdacorporation.com


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