Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).
PDF] Modelling Dependencies between Variation Points in Use Case Diagrams | Semantic Scholar
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Reuse in Use-Case Models: <<extend>>, <<include>>, and Inheritance
Financial Trade UML Use Case Diagram Example | UML Use Case Diagram Example. Registration System | UML Use Case Diagram Example - Estate Agency | Use Case Sample
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Comp310: Use Cases
Use Case Diagram - Play Hard Girls Cinema
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UML Use Case Diagrams: Tips
3 Use case diagrams
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Structuring a Use Case Model | Enterprise Architect User Guide