Common Project Manager Mistakes: #5 Assuming Estimates can be Right

Estimating is fortune telling. When we estimate how long something will take or how much it will cost or how much resource will be needed, we are using the best information available to us and our experience to predict what is required for an event, activity or deliverable before we begin. This is self-evident, particularly when we see it in writing, but it belies assumptions that we usually fail to account for in the way we estimate or plan.

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