Unified Modelling Language (UML) is the set of notations,models and diagrams used when developing object-oriented (OO) systems.

UML is the industry standard OO visual modelling language. The latest version is UML 1.4 and was formed from the coming together of three leading software methodologists; Booch,Jacobson and Rumbaugh.

UML allows the analyst ways of describing structure,behaviour of significant parts of system and their relationships.