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Practical Project Initiation: A Handbook with Tools by Karl E Wiegers

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Wideband Delphi Evaluated

No estimation method is perfect; if it were, it would be called prediction, not estimation. However, the Wideband Delphi technique incorporates some solid estimating principles. The team approach acknowledges the value of combining multiple expert perspectives. The range of estimates produced reflects the variability intrinsic to the estimation process. Steve McConnell (2006) has found that Wideband Delphi can cut estimation errors by 40 percent to 60 percent. It’s particularly useful in avoiding very large estimation errors.

Although it takes time and requires a panel of experienced estimators, Wideband Delphi removes some of the politics from estimation and filters out extreme initial values. This approach illustrates ...

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