13+ Use Case Diagram Definition. It models how an external entity interacts with the system to make it work. A use case diagram at its simplest is a representation of a user's interaction with the system that shows the relationship between the user and the different use cases in which the user is involved.
• built in early stages of development • purpose. It models how an external entity interacts with the system to make it work. Normally, domain experts and business analysts should be involved in writing use cases.
Jacobson has continued to promote this approach to system analysis to the present day.
13+ Use Case Diagram Definition. A use case is a software and system engineering term that describes how a user uses a system to accomplish a particular goal. Uml use case diagrams are ideal for: A use case diagram captures the business processes carried out in the system. While support for business modeling was declared as one of the goals of the uml, uml specification provides no notation specific note again, both business use case as well as business actor are not defined in uml standard, so you will either need to use some uml tool.