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Use Case

Use Case. What is it?. Of who can do what within a system?. Basic Definition. Describe system from user’s point of view Describe interaction between user and system Indicate system response to request/trigger originating outside the system (by user)

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Use Case

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  1. Use Case What is it?

  2. Of who can do what within a system? Basic Definition

  3. Describe system from user’s point of view • Describe interaction between user and system • Indicate system response to request/trigger originating outside the system (by user) • Provide sequence of steps involved in interaction • Depicts functional requirements of the system for a task (how task/goal achieved) Purpose of use case

  4. Users • End user • Other systems • Hardware devices Focus on the user end

  5. Complete series of events for one particular use of a system • Use case simplified from usage scenarios/usage case Why Use Case?

  6. Who creates use case?

  7. Who uses use case?

  8. Use case should: • Describe what the system shall do for the actor to achieve a particular goal. • Include no implementation-specific language. • Be at the appropriate level of detail. • Not include detail regarding user interfaces and screens. This is done in user-interface design. From http://en.wikipedia.org/wiki/Use_case#History Requirements of use case

  9. Systems design • Programming • Object-oriented design • UML (unified modeling language) • Wherever functional requirements need to be captured • Business use • Software use Applications of use case

  10. Diagram used in UML (unified modeling language) in software engineering • http://en.wikipedia.org/wiki/Use_case_diagram Use case diagram (in UML)

  11. Use case template Sample template – see http://en.wikipedia.org/wiki/Use_case for what would go in each of fields in the right hand column of this template

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