A gret book on that is Agile Estimating and Planning by Mike Cohn[1]. Having that said, there has been a lot of controversy on the value of estimates recently:

A gret book on that is Agile Estimating and Planning by Mike Cohn[1]. Having that said, there has been a lot of controversy on the value of estimates recently: Estimation is Evil[2] Purpose of Estimation[3] I believe their TL;DR comes from the second one: For me, estimation is valuable when it helps you make a significant decision [1] http://www.amazon.com/Agile-Estimating-Planning-Mike-Cohn/dp/0131479415 http://www.amazon.com/Agile-Estimating-Planning-Mike-Cohn/dp... [2] http://pragprog.com/magazines/2013-02/estimation-is-evil http://pragprog.com/magazines/2013-02/estimation-is-evil [3] http://martinfowler.com/bliki/PurposeOfEstimation.html http://martinfowler.com/bliki/PurposeOfEstimation.html