Drive implementation and generate test cases.Use case diagrams are usually developed in the early stages of development, and people often use use case modeling for the following purposes. In other words, the use of the system must be viewed from the outside, that is, the system should not be viewed from the inside, but from a higher level to determine the functionality that the system should provide to the external actors. It is an effective technique to communicate system behavior in user terms by specifying all externally visible system behaviors. A key concept of use case modeling is that it helps us to design the system from the end-user’s perspective. Once a use case is specified, it can be represented in a textual and visual representation (i.e., a case diagram). The purpose of a use case diagram is to visualize what the system should do (what) at this stage, it does not consider how (how) to do it. UML use case diagrams are the primary form of system/software requirements for new software programs under development.
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