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2. Usually for the first three iterations or until the team feels comfortable with their estimates for project components.
3. If at some any point further on in a project, estimates seem to be systematically inaccurate. If such a situation arises, it is necessary for the team to revisit its estimates and the rationale underlying those estimates.
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1. Agile Estimating and Planning. Mike Cohn. Prentice Hall, 2005.
2.
http://en.wikipedia.org/wiki/Fibonacci_number
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Notes from Agile Estimating and Planning by Mike Cohn.
