![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).
![uml - I want to create a Use Case Diagram of a Brick Breaker game, is mine correct? - Stack Overflow uml - I want to create a Use Case Diagram of a Brick Breaker game, is mine correct? - Stack Overflow](https://i.stack.imgur.com/NlAzl.png)
uml - I want to create a Use Case Diagram of a Brick Breaker game, is mine correct? - Stack Overflow
![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)