4+1

4+1 is an architectural view model. It can be considered as the first version of diagrams.

• Logical view
  • Illustrate functionalities provided to end-users
  • UML diagrams equivalent: class, state
• Process view
  • Illustrate system processes and how they interact and communication
  • UML diagrams equivalent: sequence, communication, activity
• Development view
  • Illustrates system from the programmer point of view
  • UML diagrams equivalent: package, component
• Physical view
  • Illustrate physical component interaction
  • UML diagrams equivalent: deployment
• Scenarios
  • Describe sequences of interaction between objects and processes
  • UML diagram equivalent: use case