UML Use Case Diagrams Forward and Reverse Engineering

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UML Use Case Diagrams Forward and Reverse Engineering-OOAD Lecture Notes
Forward and Reverse Engineering
To forward engineer a use case diagram: 
  • Identify the objects that interact with the system 
  • Try to identify the various roles that each external object may play
  • Make up an actor to represent each distinct interaction role
  • For each use case in the diagram, identify its flow of events and its exceptional flow of events 
  • Generate a test script for each flow using the flow's preconditions, taking into account the tests initial and post condition state as its success criteria 
  • Generate test scaffolding to show each actor that interacts with the use case wherever necessary 
  • Actors are either simulated or replaced by a real-world equivalent when they push information to the element or are acted upon by the element 
  • Use tools to run these tests whenever needed to release the element to which the use case diagram is assigned 
To reverse engineer a use case diagram: 
  • Analyze each actor that interacts with the system 
  • For each actor, study how the actor interacts with the system, changes the state of the system, or responds to some event 
  • Detect the flow of events in the executable system corresponding to each other 
  • Primary flows must be dealt with first. Later alternative paths should be considered 
  • Cluster related flows by declaring a corresponding use case 
  • Consider modeling variants using extend relationships, and common flows by applying include relationships 
  • Represent these actors and use cases in a use case diagram, and establish their relationships 
  • The executable and the atomic computations are known as the action states. This is because they are the states of the system that represent the execution of an action 


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