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ClearCase supports iterative design and development, and so should you. It is good practice to start with planning what to do and when to do it, but you also gain experience by doing. So iterate, do your first small setup, study it, document it, and continue improving your setup.
When you are confident enough with your setup, you will also have a good plan for the larger rollout. But remember, there will always be a need for tuning and improvement as you continue your iterations.
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