Uml Use Case Diagram Multiple Systems. To depict the system boundary draw a box around the use case itself. Use case diagrams specify the events of a system and their flows.
Of course they are split into multiple class diagrams as otherwise they would be totally unreadable. If you look at the uml specification the class diagrams there represent the whole uml language model. After all the functionalities of a system are found out then these functionalities are converted into various use cases which will be used in the use case diagram.
Uml is the modeling toolkit that you can use to build your diagrams.
Use case diagrams are used to analyze the system s high level requirements. These requirements are expressed through different use cases. This use case diagram tutorial will cover the following topics and help you create use cases better. Use case diagrams specify the events of a system and their flows.
