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The alternate flow, also known as an extending use case, describes normal variations to the basic flow as well as unusual situations.Ī use case should display the following characteristics: A complete use case will include one main or basic flow and various alternate flows. Use cases describe the functional requirements of a system from the end user's perspective, creating a goal-focused sequence of events that is easy for users and developers to follow. The process and steps taken to reach the end goal, including the necessary functional requirements and their anticipated behaviors. The final successful outcome that completes the process. The system user - this can be a single person or a group of people interacting with the process. A use case document can help the development team identify and understand where errors may occur during a transaction so they can resolve them.Įvery use case contains three essential elements:
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Use cases are typically written by business analysts and can be employed during several stages of software development, such as planning system requirements, validating design, testing software and creating an outline for online help and user manuals. The method creates a document that describes all the steps taken by a user to complete an activity. The use case is made up of a set of possible sequences of interactions between systems and users in a particular environment and related to a particular goal. A use case is a methodology used in system analysis to identify, clarify and organize system requirements.