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Planning Poker is an agile estimating and planning technique that is based on the decision made by agreement among group members. The Scrum Master, Product Owner and the development team are part of the Planning Poker activity. Planning and estimation are some of the crucial phases of building your project. In Agile, planing poker helps in achieving the same in Agile. The most important thing is to continuously inspect, adapt and iterate, but having a manageable team size is a good thing to start.