A use case diagram is a formal way of representing the way a business interacts with its environment. It illustrates the activities performed by the users of the system.
Elements of a use case diagram
Actor
An actor is a role that a user can play while interacting with the system. An actor can also represent another system which the system
Example
Back to parent node: UML Diagrams
UML_diagramSOFT2201ISYS2110Functional_Modelling
Reference
- Alan Dennis, David Tegarden, & Barbara Haley Wixom, 2012, Systems Analysis and Design with UML, 4th Edition, Wiley.