10+ Use Case And Activity Diagram. Therefore, those use cases and print receipt use case has the dependency extends. A use case diagram consists of the system, the related use cases and actors and relates these to each other to visualize:
The diagram is used to model the system/subsystem of an application. We model sequential and concurrent activities using activity diagrams. Such diagrams are also used to display the steps involved in the execution of a use case.
Or it might be a complete application;
10+ Use Case And Activity Diagram. So, we basically depict workflows visually using an activity diagram. Your system (4) is whatever you are developing. Or it might be a complete application; Activity diagrams as defined in the unified modeling language1 are derived from various techniques to visually illustrate workflows;