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PSP by Watts S. Humphrey

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6The PROBE Estimating Method

The principal objective of the estimating process is to produce accurate estimates. To do this, you must start with the best requirements you can get, obtain good historical data, and use a sound estimating method. Because your early estimates will likely have large errors, you also need a way to judge and improve your estimating accuracy. The PROBE method shows you how to obtain estimating data, how to use these data to make estimates, and how to measure and improve the accuracy of your estimates.

6.1 Estimating from Data

The PROBE method guides you in using historical data to make estimates. For example, in estimating the work to develop a database query system, you would first produce the conceptual design and ...

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