Richmond, B.C. – MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, today reported financial results for its third quarter ended September 30, 2006. Net earnings for the quarter increased 23% to $21 million, or $0.49 per diluted share, compared to $17 million, or $0.41 per diluted share, reported for the same period last year.

Consolidated revenues for the third quarter increased to $290 million, up 38% compared to $209 million reported for the same period a year ago. Information Products revenues increased to $196 million from $124 million for the same period last year, reflecting continued growth in the Company’s UK property information businesses. The Company’s Information Systems business also performed well, reporting revenues of $94 million for the third quarter of 2006 compared to $86 million for the same period last year.

For the nine months ended September 30, 2006, consolidated revenues increased 22% to $764 million compared to $628 million reported for the same period a year ago. Information Products revenues increased to $478 million and Information Systems revenues increased to $286 million. Net earnings increased 28% to $61 million, or $1.44 per diluted share, compared to $48 million, or $1.19 per diluted share, for the comparable period in 2005.

Three months ended
September 30,
Nine months ended
September 30,
2006
2005

2006
2005
($ millions, except per common share amounts)
Consolidated revenues
289.8
209.5
763.9
628.1
Earnings before income taxes
28.9
24.7

86.6
69.2
Net earnings
20.8
16.9

61.5
48.1
Net earnings per diluted share
0.49
0.41
1.44
1.19

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.

MDA’s Third Quarter 2006 unaudited Consolidated Financials are available at: http://www.mdacorporation.com/investor/financial_reports.shtml

Investor/Analyst Conference Call Today

MDA President and CEO Daniel Friedmann and Executive Vice President and CFO Anil Wirasekara will be available on a Conference Call today, October 31, 2006 at 1:30 p.m. Pacific (4:30 p.m. Eastern) to explain the financial results of the Company and to answer questions.

To participate, dial 1-866-898-9626 in Canada or the United States
In Toronto, dial 416-340-2216

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

Telephone replay will be available until November 7 2006, at the following numbers:
Toll free, International, dial 1-800-408-3053
In Toronto, dial 416-695-5800
Pass Code: 3199843

Related Websites:

www.mdacorporation.com

Forward-Looking Statement

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.