A Feature is a service that fulfills a stakeholder need. Each feature includes a benefit hypothesis and acceptance criteria, and is sized or split as necessary to be delivered by a single Agile Release Train (ART) in a Program Increment (PI). A Capability is a higher-level solution behavior that typically spans multiple ARTs. Capabilities are sized and split into multiple features to facilitate their implementation in a single PI. Features also lend themselves to the Lean UX process model, which includes a definition of the Minimum Marketable Feature (MMF), a benefit hypothesis, and acceptance criteria. The MMF helps limit the scope and investment, enhances agility, and provides fast feedback. Capabilities behave the same way as features. However, they are at a higher level of abstraction and support the definition and development of large Solutions. Details Features and capabilities are central to the SAFe Requirements Model. They are critical to defining, planning, and implementing Solution value.