Hence to model the entire system, a number of use case diagrams are used. A single use case diagram captures a particular functionality of a system. The diagram is used to model the system/subsystem of an application. Use case diagrams consists of actors, use cases and their relationships. These internal and external agents are known as actors. ![]() Now as we have to discuss that the use case diagram is dynamic in nature, there should be some internal or external factors for making the interaction. ![]() In UML, there are five diagrams available to model the dynamic nature and use case diagram is one of them. ![]() Only static behavior is not sufficient to model a system rather dynamic behavior is more important than static behavior. Dynamic behavior means the behavior of the system when it is running/operating. To model a system, the most important aspect is to capture the dynamic behavior.
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