A product backlog item is “ready” when it contains at least these five elements:
1. A description
2. Has been placed in the proper order (prioritized)
3. Has been estimated
4. The value of the item has been articulated
5. Contains a test description or an acceptance criteria to prove its completeness when it’s “done”
The product backlog is maintained thorough product backlog refinement.
§ Refinement is the continuous act of adding detail, estimates, and order to items.
§ The Product Owner and Development Team collaborate in the refinement process.
§ Refinement should not take up more than 10% of the Development Team’s time.
§ The higher the order of the product backlog item, the more refined it should be.
The Product Backlog should contain enough “ready” product backlog items to occupy the Development Team for the next sprint so they may be selected by the Development Team to be “done” in the sprint planning event and accomplish a Sprint goal.