Product Backlog Items (PBIs) are the elements that make up the Product Backlog. They can range from specifications and requirements, to use cases, epics, User Stories, or even bugs and chores. Each PBI must have these qualities:
- Description: What the goal of the PBI is.
- Value: the Business Value of the PBI as determined by the Product Owner.
- Estimate: the Team needs to estimate the relative effort it will take to move the PBI to Done.
- Order: The Product Owner needs to prioritize PBIs by their relative value.
Together these qualities make up the Definition of Ready. Having a ready Backlog can double a Team’s Velocity. Ideally, PBIs reflect the needs of customers or stakeholders. A common way to incorporate the end users’ needs is to write the PBI in the form of a User Story.
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