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