Planning Poker a game using Story Points to apply estimates to Stories; it uses the Delphi method of arriving at consensus by a voting approach designed to avoid influence bias.
How it Works:
Each estimator selects a set of cards.
Facilitator reads item to be estimated, and moderates a brief discussion to clarify details.
Facilitator calls for estimates. Each estimator places estimate face down, hiding the value.
Facilitator calls for vote, and all estimators turn over cards at the same time.
If all cards agree, their value is recorded as the estimate.
Otherwise, facilitator asks high and low estimators to explain their reasoning, and moderates a brief discussion to clarify issues.
Repeat 3-6 until estimates converge.