How detailed does the WBS need to be?

The general answer to this question is to go far enough down in levels and details to be sure your schedule estimates will have a good degree of accuracy. One rule of thumb is to take the WBS down to activity blocks of no more than 2-weeks' duration. But the level of detail, and what constitutes the right degree of accuracy, is ultimately a judgment call for the project manager. As you're breaking the work down, ask yourself questions like these…

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