Use Case Diagram


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• For example, a timer that triggers sending of an e-mail reminder • primary - a user whose goals are fulfilled by the system • importance: define user goals • supporting - provides a service (e.g., info) to the system • importance: clarify external interfaces and protocols • offstage - has an interest in the behavior but is not primary or supporting, e.g., government • importance: ensure all interests (even subtle) are identified and satisfied Finding Actors 1 External objects that produce/consume data: • Must serve as sources and destinations for data • Must be external to the system Finding Actors 2 Ask the following questions: • • • • • Who are the system’s primary users Who requires system support for daily tasks Who are the system’s secondary users What hardware does the system handle Which other (if any) systems interact with the system in question • Do any entities interacting with the system perform multiple roles as actors • Which other entities (human or otherwise) might have an interest in the system s output What is a user story •An abbreviated description of a use case •Used in agile development Answers 3 questions: 1.Who 2.Does what 3.And why As a type of user , I want some behavior from the system so that some value is achieved Use Case Diagrams • A picture • describes how actors relate to use cases • and use cases relate to one another • Diagrams are not essential • They are helpful in giving an overview, but only secondary in importance to the textual description • They do not capture the full information of the actual use cases • In contrast, text is essential Use Case Diagram Objective • Built in early stages of development • Purpose • Specify the context of a system • Capture the requirements of a system • Validate a systems architecture • Drive implementation and generate test cases • Developed by analysts and domain experts How do use case diagrams fit in This applies also to use case descriptions..


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