You have the permission to use, distribute, and reproduce these in any medium, provided the source and authors are credited. To add text, just click and type.All visualizations, data, and code produced by Our World in Data are completely open access under the Creative Commons BY license. You can quickly add shapes and users and connect them. Start with one of SmartDraw's blank UML diagram templates or an included use case diagram example. An "extends" relationship indicates alternative options under a certain use case. For relationships among use cases, use arrows labeled either "uses" or "extends." A "uses" relationship indicates that one use case is needed by another in order to perform a task. Illustrate relationships between an actor and a use case with a simple line. When one system is the actor of another system, label the actor system with the actor stereotype. 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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