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Each division Director will submit their intended representitive representative to SRM. SRM will make the final decision on membership.
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I still think that setting up he dotted line relationship to the Director of ATA would give the Chief Architecture Planners a an enhanced sense of independence, responsibility and importance, however, if you guys can't live with it I will back down. Feel free to put some words in here.
Suggested Approach:
Start with a product, such as BlackBoard, and trace the architectural dependencies.