The Unified Modeling Language (UML) resulted from a joint effort of leading experts in object-oriented analysis and design, Grady Booch, Jim Rumbaugh and Ivar Jacobson, also known as the three amigos, all currently employees of Rational.

Unified Modeling Language


  • class diagrams -- conceptual structure
  • use cases -- functional requirements
  • interaction diagrams -- operational characteristics
  • package and deployment diagrams -- implementation
  • state and activity diagrams -- dynamic behavior

See and UML Distilled,  [Fowler97]

slide: UML

slide: Class diagrams

slide: Use cases

slide: Interaction diagrams

slide: Package and deployment diagrams

slide: State diagrams


The UML toolbox is very rich. It allows you to model every conceivable aspect of the system. Nevertheless, to my mind, graphical models are not always appropriate. But, on the other hand, most people like them and they often make a good impression, suggesting clarity ...