1. Everyone must understand what done means.
2. This varies significantly per Scrum team, members must have a shared understanding of what it means for work to be completed.
3. This guides development team in knowing how many product backlog items it can select during a sprint planning meeting.
4. The purpose of each sprint is to deliver Increments of potentially releasable functionality to the definition of “done”5. Definition of Done may change during the project.