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product backlog
Within agile project management, product backlog refers to a prioritized list of functionality which a product should contain. It is sometimes referred to as a to-do list, and is considered an 'artifact' (a form of documentation) within the scrum software development framework. The product backlog is referred to with different names in different project management frameworks, such as product backlog in scrum, work item list in disciplined agile, and option pool in lean. In the scrum framework, creation and continuous maintenance of the product backlog is part of the responsibility of the product owner.A sprint backlog consists of selected elements from the product backlog which are planned to be developed within that particular sprint.
In scrum, coherence is defined as a measure of the relationships between backlog items which make them worthy of consideration as a whole.