Chapter 23. Allowing for Inaccuracy in Estimates
It's quite likely, and in fact expected, that an estimate and its actual outcome will differ. It's all part of what it means to be an estimate. If the actual outcome will differ, then it could be different enough to change how the decision should have been made. If a decision to develop a new software product was based on estimated sales and the actual sales turned out to be a lot lower than estimated, the actual sales could conceivably be low enough that the product loses a lot of money. If it were known beforehand how low the sales would actually be, the organization would have decided to not develop the product in the first place. So how do you allow for the fact that the estimate and the actual ...
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