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The Planning Phase of any project is one of the most critical phases. It is where assumptions and estimates are made about what needs to be done, who will do it, and how long it will take. Dependencies and risk are factored into the development of the plan. With greater certainty we are able to develop a realistic plan. Conversely, with more uncertainty the less realistic the plan will be.
But, how much time, energy and money should we put into the planning phase? At what point do we achieve diminishing returns? At what point must we admit that we are at such a level of uncertainty that we cannot make realistic estimates?
Looking at the Project Management Lifecycle chart below (click to download) we see that the planning phase certainly contains a lot of activities and deliverables. The key defining activity that will give the best guidance to how much planning should be done up front is the WBS.
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