Käyttötapauskaavion
Käyttötapauskaavio, known in English as a Use Case Diagram, is a behavioral diagram in the Unified Modeling Language (UML) that visually represents the functionality of a system from the perspective of its users. It illustrates the interactions between different actors and the use cases they perform. Actors are typically external entities, such as people, other systems, or devices, that interact with the system. Use cases, on the other hand, describe a specific sequence of actions a system performs to achieve a measurable result for an actor.
The primary purpose of a use case diagram is to capture the functional requirements of a system.