Use Case Diagram Example: Passenger Service

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In UML, use case diagrams model the behavior of a system and help capture the requirements of the system. Use case diagrams illustrate and define the context and requirements of the entire system or significant parts of the system.

  • Use case diagrams describe the high-level functionality and scope of a system.

  • These diagrams also identify the interactions between the system and its actors.

  • In UML, use case diagrams model the behavior of a system and help capture the requirements of the system.

You can use a single use case diagram to model a complex system, or create many use case diagrams to model the components / systems of the system. You will typically develop use case diagrams in the early stages of a project and refer to them throughout the development process.

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