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UML (Unified Modeling Language) - a visual modeling language, general purpose of which is to be used for specifying, visualizing, constructing, and documenting the elements of the custom software development systems. The UML was developed by Rational Software Corporation for the unification of the best properties possessed by the earlier methods and ways of notation. In 1997, the organization OMG (Object Management Group - a group of facilities management) recognized it as a standard modeling language. 

The project participants and the process make up of two elements of the "triangle" in the success of a custom software development project. The third element consists of language and modeling tools. The elements requiring being modeled should be expressed and documented.  The Developers need a language to build visual models as well as models of other types, and discuss them with customers and colleagues. The language should permit to build models at different levels of abstraction for the representation of proposed solutions at different levels of detailing.