Use Case Model Uml. Using a uml use case model you can t. Select use case subject in toolbox.
Use case models are meant to be a top down horizontal description of functionality not a blow by blow description of behavior. 3 oo uml actor an actor is a role played by an object outside of a system that interacts directly with the system a single object may play several roles and therefore be represented by several actor symbols in the model actors either actively or passively participate in one or more use cases staff visitor. A use case model shows a view of the system from the user perspective thus describing what a system does without describing how the system does it.
Where use cases are used to represent the set of activities services that system needs to perform and actors are the entity that work under defined roles within the system.
A use case diagram consists of a use case and an actor. Drag on the diagram as the size of use case subject. In uml there are five diagrams available to model the dynamic nature and use case diagram is one of them. This uml use case diagram example shows actor and use cases for a hospital s reception.
