In UML v1.0 nine types of diagrams are described:
|UML Use Case Diagram||UML Activity Diagram|
|UML Object Diagram||UML Class Diagram|
|UML Sequence Diagram|
|UML Collaboration Diagram||UML StateChart Diagram|
|UML Component Diagram||UML Deployment Diagram|
In v2.0 several aspects of UML got changed. Some of the 9 UML diagram types got significantly updated and four new diagram types were added.