Label the ovals with verbs that represent the system's functions.Īctors are the users of a system. Place actors outside the system's boundaries.ĭraw use cases using ovals. Basic Use Case Diagram Symbols and Notationsĭraw your system's boundaries using a rectangle that contains use cases. Use case diagrams specify how the system interacts with actors without worrying about the details of how that functionality is implemented. They provide a good high level analysis from outside the system. They also help identify any internal or external factors that may influence the system and should be taken into consideration. Use case diagrams are valuable for visualizing the functional requirements of a system that will translate into design choices and development priorities. The "actors" are people or entities operating under defined roles within the system. In this context, a "system" is something being developed or operated, such as a web site. Use cases are a set of actions, services, and functions that the system needs to perform. Use case diagrams model the functionality of a system using actors and use cases. Use Case Diagram What is a Use Case Diagram?Ī use case diagram is a dynamic or behavior diagram in UML.
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