Planning Poker represents expert-based estimation with a structured group consensus approach. The method originates from agile software development where it was created in order to provide a lightweight approach for estimating software development interactions and planning the scope of software releases. Unlike other alternative expert-based methods, Planning Poker explicitly makes use of historical project data. Actually, the method focuses on estimating the functional size of developed software and then uses historical data on development productivity to come up with the effort required to develop software of a given functionality.
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