During the sprint planning meetings, the Scrum team plan the work to be performed during the next sprint. As the Scrum sprint is a time-boxed period, the delivery of software has to be calibrated to fit in it. Planning poker is a collaborative estimation technique used to achieve this goal. Planning Poker is a process defined (and registered) by Mike Cohn. During a planning poker session, upcoming features are discussed and refined by the product owner and the developers. Then, estimators select one card to represent the value of their estimate. All cards are revealed at the same time. The value of the scale can then be translated in story points, ideal days or other concept used by the teams to finalize the sprint planning. The usage of a scale instead of traditional man/days metric offers a simpler and stable measure of the backlog complexity, whether the effort required for each user story and the speed of its delivery (velocity) might vary during the evolution of the team in time. It is important to remember that, as many of the Agile software development practices, the main goal of a planning poker session is to create a discussion in the Scrum team and fulfill the objectives of interactions, collaboration and teamwork promoted by the Agile Manifesto values and principles. The situation is simple if everybody agrees on the complexity of a backlog item. Otherwise, people with smaller or larger estimates should share their reasons for thinking differently than their colleagues. Here [...]
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