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Software Estimation: Demystifying the Black Art by Steve McConnell

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Chapter 15. Use of Multiple Approaches

No single estimation technique is perfect, so using multiple approaches is useful in many contexts. The most sophisticated commercial software producers tend to use at least three different estimating approaches and then look for convergence or spread among their estimates. Convergence among the estimates tells you that you probably have a good estimate. Spread tells you that there are probably factors you have overlooked and need to understand better. This technique applies equally ...

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