The INVEST mnemonic for Agile software development projects was created by Bill Wake as a reminder of the characteristics of a good quality Product Backlog Item (commonly written in user story format, but not required to be) or PBI for short. Such PBIs may be used in a Scrum backlog, Kanban board or XP project.
|I||Independent||The PBI should be self-contained.|
|N||Negotiable||PBIs are not explicit contracts and should leave space for discussion.|
|V||Valuable||A PBI must deliver value to the stakeholders.|
|E||Estimable||You must always be able to estimate the size of a PBI.|
|S||Small||PBIs should not be so big as to become impossible to plan/task/prioritize within a level of accuracy.|
|T||Testable||The PBI or its related description must provide the necessary information to make test development possible.|
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