UML Basics

UML = Unified Modelling Language

UML Models

• Business System Model (BSM)
• IT System Model (ISM)

UML Views

• BSM
  - External view
  - Internal View
• ISM
  - Static view
  - Dynamic view

UML Diagrams

• Class diagram
  • classes within the system
  • methods and fields
  • associations, generalizations and cardinality
• Component diagram
  • components of the system
  • contains implemented and required interfaces
  • components can be nested
• Sequence diagram
  • shows call sequence
  • shows the calling class, called method and returned data type
  • can show loops
• State diagram
  • shows states or activities
  • shows allowed transitions
  • can be nested
  • can depict internal activities
• Activity diagram
  • modern flowcharts
  • shows process or workflow
  • can be nested
  • can show concurrent actions
  • can have swim lanes
• Layer diagram
  • Microsoft specific (non-standard, invented by MS)
  • shows areas of concern
  • show references between areas
  • can be validated
• Use Case diagram
  • show actors
  • shows use cases
  • binds actors to use cases
  • can depict generalizations