Scrum Effort Estimations – Planning Poker® All user stories within the Scrum Product Backlog have to be estimated to allow the Scrum Product Owner to prioritize them and plan releases. That means the Scrum Product Owner needs a reliable assessment of how much the delivery of each user story will take. Nevertheless, it is recommended that the Scrum Product Owner does not interfere with the estimations that the Scrum Team performs. So the Scrum Team delivers its estimates without feeling any pressure from the Scrum Product Owner.
The Scrum Framework itself does not prescribe a way for the Scrum Teams to estimate their work. The teams who rely on the Scrum Framework do not deliver their estimates of user stories based on time or person-day units. Instead, they provide their estimates by using more abstract metrics to compare and qualify the effort required to deliver the user stories.
Common estimation methods include: • Numeric sizing (1 through 10), • T-shirt sizes (XS, S, M, L, XL, XXL, XXXL), or • the Fibonacci sequence (0, 1, 2, 3, 5, 8, 13, 21, 34, etc)
An Example User story
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