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Planning Poker is a way of attaching complexity to items from the Development Team. This practice is used by many teams to estimate and plan work more effectively. You will have to discover whether these practices will work for you too.
As a team applies this practice more frequently, their forecast also becomes more reliable. As a Product Owner, this practice can help you to clarify how many points a team can pick up per Sprint, as well as helping to predict more effectively when you expect that to be delivered.