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What is UML?

UML stands for Unified Modeling Language. This object-oriented system of notation has evolved from the work of Grady Booch, James Rumbaugh, Ivar Jacobson, and the Rational Software Corporation. These renowned computer scientists fused their respective technologies into a single, standardized model. Today, UML is accepted by the Object Management Group (OMG) as the standard for modeling object oriented programs.

 

Types of UML Diagrams

UML defines nine types of diagrams: class (package), object, use case, sequence, collaboration, statechart, activity, component, and deployment.

A Hands-On Introduction for Developers   
http://edn.embarcadero.com/article/31863
UML Class Diagrams   
http://www.smartdraw.com/resources/tutorials/uml-class-diagrams/#/resources/tutorials/Introduction-to-UML