meeting -*- Outline -*-

* Use-Case Model: Writing Requirements in Context (Larman, Ch. 6)

     The Use-case model is the set of all use cases,
     it is a model of the system's functionality and environment

** goals and stories (6.1)
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            USE CASE MODEL
  REQUIREMENTS IN CONTEXT (LARMAN CH. 6)

Use case = 

Key idea:


Example in brief format:

  Process Sale:








       FOR YOU TO DO IN GROUPS

Write one use case, in brief format,
for your system

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     ... story of using the system
     ... how can this fulfill user goals (add value)?
         (vs. just listing features)

     ... work out this first example with students

         brief format is just a paragraph

         Put the student ones on the board
             and discuss

** Use cases and adding value (6.3)

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        MORE TERMS (6.3)

Actor =

Scenario = 


So a use case is:


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     ... something or someone with behavior
                   person identified by role, computer system, organization

     Q: What are some of the actors in the POS system?

     ... a specific sequence of actions and interactions between
         actors and the system
         Scenario also called a use case instance

     
     ... a set of related success and failure scenarios that describes
         actors using a system to support a goal.

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     EXAMPLE CASUAL FORMAT USE CASE

Handle Returns

Main success Scenario:






Alternative Scenario:





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        develop these in class
        concentrate on the alternatives, since we already did the happy path

        ... Alternatives:
              If credit authorization is reject, ...

              If the item identifier is not found in the system, ...

              If the system detects failure to communicate with the
              external tax calculator system, ...

        Start a new paragraph for each actor

        emphasize finding value for the actors,
        don't get a feature and function list

        Have the students do another use case in casual format from
        their system (if time)