It presents a large complex project as a set of small functionalities.They bring customers, and all other users on the same page, making communication easy.They are presented in a simple and non-technical way, easy to understand by all technical and business users.It elicits the functionality as a black box with all the users who have access or a role in it. Using a Case diagram is a functional requirement documentation technique.The diagrams do not give the details of deployment, the trigger of the event, etc. It also presents the functionality’s exceptions, pre-condition, and post-condition. The observable outcome of the functionality to the actor and other stakeholders of the system is shown with clarity. It represented the collaboration and interdependence of the functionality and users in a very easy and understandable manner. The presentation is from the perspective of all users giving a high-level design and basic flow of events of the system. The main purpose is to present all functional requirements of the system diagrammatically to all the users who can access the functionality. Hence multiple use case diagrams represent the complete system. For every single functionality representation, a fresh diagram is used. design, implementation, process, and deployment. Use Case diagram represents the system’s functionality connecting all four perspectives, i.e.
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