Agile → Overview → Products, Releases, Sprints, and Teams → Teams
In an agile environment, resource management concepts--demand, velocity, commitment, and acceptance--are focused more on teams than on individuals. An agile team is defined as "all of the team members who commit to all of the work required to complete a single story during a single sprint, including all tasks and dependencies that are related to that story." A team should only commit to working on stories that have a high priority and a high business value. And a team should use its velocity to determine how many stories to which it can commit in an upcoming sprint.
Teams frequently commit to more than one story per sprint, but it is important to understand that the effort required to complete the work required by a single story (including all of its related tasks and dependencies) is done in a single sprint by a single agile team. Some assignments (like tasks) are identified before the sprint begins, while others (like defects and impediments) are discovered during the sprint. Assignments, once completed, are submitted to the team (for review) and to the product owner (for acceptance).
At a minimum, the relationships between product owners, product backlogs, and teams is 1:1 (meaning there is a single product owner who manages a single product backlog; the single product owner assigns work items from the single product backlog to a single agile team. There can, of course, be many more combinations than that.
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