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Understanding Use Case Diagrams in Unified Modeling Language (UML)

This document provides an overview of Use Case Diagrams within the Unified Modeling Language (UML), highlighting the relationships between actors and use cases. It defines actors as entities that interact with the system and illustrates how use cases represent specific actions within that system. The diagram includes system boundaries and relationships, such as <<include>> and <<extend>>, which demonstrate how use cases can share functionality. By understanding these concepts, you can better model system interactions and functionalities.

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Understanding Use Case Diagrams in Unified Modeling Language (UML)

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  1. COP 4331 Recitation #1

  2. COP 4331 Recitation #1 • Kia Manoochehri • kiam@knights.ucf.edu

  3. Unified Modeling Language Use Case Diagrams

  4. Use Case Diagram • Describes the relationship between “actors” and use cases • An actor is something that interacts with the system Actors

  5. Use Case Diagram • A use case represents some action that takes place within the system Login

  6. Use Case Diagram • Additionally: • A large box denotes the system boundary • A line between an actor and use case denotes that the actor participates in the use case

  7. Use Case Diagram • <<include>> • A use case includes the functionality described in the previous one. • Represented by a directed arrow having a dotted shaft, labeled with <<include>> Check Fines Pay Fines <<include>>

  8. Use Case Diagram • <<extend>> • A use case may include the functionality described in another use case BorrowItem FindItem <<extend>>

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