Two Weeks

It seems that the rhythm to developing software in XP marches to a beat marking TwoWeeks. What is magic about TwoWeeks?

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• Nobody can estimate anything with any accuracy of duration greater than TwoWeeks.
• How wrong can you be in TwoWeeks?

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I tried OneWeek instead of TwoWeeks in a project recently, and I think OneWeek is just too short for useful stories to emerge. We ended up tacking simpler stories first since they fit the week boundary, instead of the riskier ones.

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See ProjectVelocity