Use case diagrams are used to define and organize functional requirements in a system along with specifying the context. They show how a user will trigger a response from the system and what is the expected response. They represent the end-user interaction goals and methods. UML use case diagrams are used for many purposes, for example: Thus, they provide a high-level analysis of the design from the outside without worrying about the functionality details. These requirements are later translated into design choices and development priorities.Īpart from the interaction model, use case diagrams also help to identify internal or external factors that can influence the workflow of the system. Use case diagrams to help to visualize the functional requirements of a system. In UML, the purpose of a use case diagram is to demonstrate the different interaction methods for the end-user.
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