What Is the UML?
The Unified Modeling Language (UML) is the successor to the wave of object-oriented analysis and design (OOA&D) methods that appeared in the late '80s and early '90s. It most directly unifies the methods of Booch, Rumbaugh (OMT), and Jacobson, but its reach is wider than that. The UML went through a standardization process with the OMG (Object Management Group) and is now an OMG standard.
The UML is called a modeling language, not a method. Most methods consist, at least in principle, of both a modeling language and a process. The modeling language is the (mainly graphical) notation that methods use to express designs. The process is their advice on what steps to take in doing a design.
The process parts of many methods books ...
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