The Increment is the sum of all the Product Backlog items completed during a Sprint and the value of the Increments of all previous Sprints. At the end of a Sprint, the new Increment must be "Done," which means it must be in useable condition and meet the Scrum Team’s Definition of "Done". An Increment is a body of inspectable, done work that supports empiricism at the end of the Sprint. The Increment is a step toward a vision or goal. The Increment must be in useable condition regardless of whether the Product Owner decides to release it.