Modeling in UML

					Requirements Engineering
  for Web Applications
    SR: System Vision Document
   Written by key stakeholders
   An executive summary of the solution
   A high-level description of the problem that the system
    will address as a set of issues stated in business terms.
   The list of stakeholders and users of the system with
    their descriptions, concerns, and responsibilities.
   A list of features of the system expressed in business
    terms.
   A list of system constraints described in business terms.
   A list of nonfunctional constraints related to overall
    enterprise environment, including development
    standards and processes of the organization, limitation in
    cost or resources, etc.
              SR: User-Stories
   An effective intermediate stop to the use cases
   A half-day workshop with representative of the
    user community
   Ask them to write up what they expect the
    possible interactions of the various users with the
    system are as stories
   Not give the users too much time to write stories.
   User stories are a throwaway artifact, not
    maintained.
   Used as a basis for system use cases
   Good for user experience model
          SR: Use Case Model - 1
   Actors
       A role played by a person or system that is external to
        the system but interacts with it.
   System use case
       A sequence of actions that describe the interaction
        between the actors and the system for a specific task
        or function
   Use case model
       UML diagrams and the use case definitions
       A synthetic view of the functionality of the system
        SR: Use Case Model - 2
   Objectives of the use case model
     Produce some diagrams that represent the
      actors and their relationships (actor diagrams)
     Produce diagrams that represent the use
      cases with the actors and their relationships
      (use case diagrams)
     Organize the use cases into packages that
      map to the conceptual categorization of the
      system functions
        SR: Use Case Model - 3
   Use the following to produce first draft of
    use cases
     User stories
     Business use case model
     Business object model
     Vision document
   Organize use cases into “business
    packages”, each of which contributes to
    the realization of a specific business
    function
        SR: Use Case Model - 4
   Refine use cases
     Use a template for use case definition
     Remove any ambiguity
     Resolve conflicts
     Use the business rules to identify alternative
      paths in the use cases
     Add concepts that are pertaining to the
      system, but the business to the
      business/system glossary
              SR: Test cases
   As soon as the use cases are defined, test
    designer should start identifying
     Test scenarios
     Test cases

   Preparing of test cases can also help in
    validating use cases
               SR: Summary
   Artifacts of SR
     Vision document
     User stories
     Use case definition
     Use case model
     System glossary
     Use case packages

				
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posted:11/10/2010
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