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Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).
Concept: Use-Case Model
UML Use Case Diagram - Javatpoint
Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).
Software Engineering – Use Case Diagrams / Descriptions | Computer Science: Source
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