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Extreme Programming Installed by Chet Hendrickson, Ann Anderson, Ron Jeffries

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With improving ability to predict everyday progress, and improving ability to relate past stories to future ones, you can easily improve your estimates.

The improved estimates do come closer to promises, but an XP team doesn't fall into that trap. They know that estimates are just guesses wearing a nice outfit. Instead, the XP team uses actual performance, plus enhanced estimates, to control the project outcome.

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