![Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors). Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).](https://www.uml-diagrams.org/use-case-diagrams/use-case-diagram-elements.png)
Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).
![PDF] An Automatic Subsystem Grouping Scheme using Use Case Dependency Graph for Large Complex Systems | Semantic Scholar PDF] An Automatic Subsystem Grouping Scheme using Use Case Dependency Graph for Large Complex Systems | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/7b14abf0d22aa7cabccd134b64e0b1c3ce14b456/5-Figure4-1.png)
PDF] An Automatic Subsystem Grouping Scheme using Use Case Dependency Graph for Large Complex Systems | Semantic Scholar
![Financial Trade UML Use Case Diagram Example | UML Use Case Diagram Example. Registration System | UML Use Case Diagram Example - Estate Agency | Use Case Sample Financial Trade UML Use Case Diagram Example | UML Use Case Diagram Example. Registration System | UML Use Case Diagram Example - Estate Agency | Use Case Sample](https://www.conceptdraw.com/How-To-Guide/picture/financial-trade-uml.png)
Financial Trade UML Use Case Diagram Example | UML Use Case Diagram Example. Registration System | UML Use Case Diagram Example - Estate Agency | Use Case Sample
![Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors). Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).](https://www.uml-diagrams.org/use-case-diagrams/business-use-case-diagram-elements.png)
Use case diagrams are UML diagrams describing units of useful functionality (use cases) performed by a system in collaboration with external users (actors).
![Difference Between Use Case Diagram and Activity Diagram | Compare the Difference Between Similar Terms Difference Between Use Case Diagram and Activity Diagram | Compare the Difference Between Similar Terms](https://i1.wp.com/www.differencebetween.com/wp-content/uploads/2018/06/Difference-Between-Use-Case-Diagram-and-Activity-Diagram-fig-1.png?resize=568%2C358&ssl=1)