Unified Modeling Language - Topics - Diagrams Overview

Diagrams Overview

UML diagrams
Structural UML diagrams
  • Class diagram
  • Component diagram
  • Composite structure diagram
  • Deployment diagram
  • Object diagram
  • Package diagram
  • Profile diagram
Behavioral UML diagrams
  • Activity diagram
  • Communication diagram
  • Interaction overview diagram
  • Sequence diagram
  • State diagram
  • Timing diagram
  • Use case diagram

UML 2.2 has 14 types of diagrams divided into two categories. Seven diagram types represent structural information, and the other seven represent general types of behavior, including four that represent different aspects of interactions. These diagrams can be categorized hierarchically as shown in the following class diagram:

UML does not restrict UML element types to a certain diagram type. In general, every UML element may appear on almost all types of diagrams; this flexibility has been partially restricted in UML 2.0. UML profiles may define additional diagram types or extend existing diagrams with additional notations.

In keeping with the tradition of engineering drawings, a comment or note explaining usage, constraint, or intent is allowed in a UML diagram.

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