It is essential to analyze the whole system before starting with drawing a use case diagram, and then the system's functionalities are found. It represents the interaction between the actors.It recognizes the internal as well as external factors that influence the system.It depicts the external view of the system.It represents how an entity from the external environment can interact with a part of the system.įollowing are the purposes of a use case diagram given below: It invokes persons, use cases, and several things that invoke the actors and elements accountable for the implementation of use case diagrams. It accumulates the system's requirement, which includes both internal as well as external influences. The main purpose of a use case diagram is to portray the dynamic aspect of a system. It depicts the high-level functionality of a system and also tells how the user handles a system. It models the tasks, services, and functions required by a system/subsystem of an application. It encapsulates the system's functionality by incorporating use cases, actors, and their relationships. A use case diagram is used to represent the dynamic behavior of a system.
