Summary System Analysis and Design Chapter 5

Chapter 5
Use Case Descriptions
 Use case description: textual model that lists and describes the processing details for a use case
 Fully developed use case descriptions provide information about each use case, including actors,
stakeholders, preconditions, post conditions, the flow of activities and exceptions conditions




Use Case Description Details
 Use case name
 Verb-noun
 Scenario (if needed)
 Unique set of internal activities within a use case
 A use case can have more than one scenario (special case or more specific path)
 Triggering event
 Based on event decomposition technique
 Brief description
 Written previously when use case was identified
 Actors
 One or more users from use case diagrams
 Related use cases <<includes>>
 If one use case invokes or includes another
 Stakeholders
 Anyone with an interest in the use case
 Preconditions
 Condition that must be true before the use case begins
 Post conditions
 Condition that must be true when the use case is completed
 Use for planning test case expected results
 Flow of activities
 The activities that go on between actor and the system
 Exception conditions
 Where and what can go wrong

, Fully developed use case description example (Create customer account)




Activity Diagram for Use Case (Create Customer Account)



 Synchronization bar for loop
 Decision diamond