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  Benefits and Pitfalls of Use Cases

Benefits of use case

  • Uses the use centric approach ,
  • Provide a clearer understanding of what they expect from the proposed system and how to interact with the system,
  • The users can clarify their requirements,
  • Helps in the generation of test cases,
  • Helps to ensure that developers pay greater importance to the task orientation of the system, and.
  • Can be more directly converted into object model in object oriented design.

Pitfalls of use cases:

  • Ensure that the use cases are detailed enough and not too abstract,
  • Do not duplicate the same sequence of steps across multiple use cases,
  • Do not include user interface design and data definitions in use cases and.
  • Do not attempt to create a use case for every requirement,

Some examples are provided to better understand the concept of use case

Example 1.To draw the use case diagram for an editor just like the simplified UNIX VI like editor the essential functions are file manipulation functions that are create, save and open. Insert and modify are intended as higher level phrases covering the typical text editing functions. Note that some capabilities such as search copy and move may be neglected, since they are not mentioned explicitly. In this example, user system interaction occurs and the user can access the various functions o f editor. It is shown in fig 3.6.

Example2.A scenario in the interactive environment marketing case could be the seller; Anita usually counts the number of items available for sale. Computes their prices and then begins to advertise them through the interactive system. Of course if one tries to specify the system in this way one would finish with a huge number of such scenarios. Use cases try  to generalize such  scenarios into  use cases class where each  use case class cover what  might be called a large number of typical scenarios. It is shown in table 3.1

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