What is the difference between extend and include functions in a use case diagram and their uses? - Quora
![Use Case Diagram, UML Diagrams Example: "Include" and "Extend" Use Cases - Visual Paradigm Community Circle Use Case Diagram, UML Diagrams Example: "Include" and "Extend" Use Cases - Visual Paradigm Community Circle](https://circle.visual-paradigm.com/wp-content/uploads/2017/08/Use-Case-Diagram-Include-and-Extend-Use-Cases-1-1280x720.png)
Use Case Diagram, UML Diagrams Example: "Include" and "Extend" Use Cases - Visual Paradigm Community Circle
![UML use case include relationship shows that behavior of the included use case is inserted into the behavior of the including use case. UML use case include relationship shows that behavior of the included use case is inserted into the behavior of the including use case.](https://www.uml-diagrams.org/use-case-diagrams/use-case-include-split.png)
UML use case include relationship shows that behavior of the included use case is inserted into the behavior of the including use case.
![requirements - Are using <<include>> and <<extend>> relationship in this use -case diagram actually same? - Software Engineering Stack Exchange requirements - Are using <<include>> and <<extend>> relationship in this use -case diagram actually same? - Software Engineering Stack Exchange](https://i.stack.imgur.com/Lg39Q.png)
requirements - Are using <<include>> and <<extend>> relationship in this use -case diagram actually same? - Software Engineering Stack Exchange
![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).
![Use Case Diagram, UML Diagrams Example: Website (structuring use cases with extend and include use case) - Visual Paradigm Community Circle Use Case Diagram, UML Diagrams Example: Website (structuring use cases with extend and include use case) - Visual Paradigm Community Circle](https://circle.visual-paradigm.com/wp-content/uploads/2017/08/Use-Case-Diagram-Website-_-Structuring-use-cases-with-extend-and-include-use-case-3-1280x720.png)
Use Case Diagram, UML Diagrams Example: Website (structuring use cases with extend and include use case) - Visual Paradigm Community Circle
![UML Use Case Diagram: Do generalisation children inherit include/extends from parent? - Stack Overflow UML Use Case Diagram: Do generalisation children inherit include/extends from parent? - Stack Overflow](https://i.stack.imgur.com/c6S0D.png)