What is UML and how it is used for testing?

The Unified Modeling Language (UML) is the industry-standard language for specifying, visualizing, constructing, and documenting the artifacts of software systems. It simplifies the complex process of software design, making a "blueprint" for construction. UML state charts provide a solid basis for test generation in a form that can be easily manipulated. This technique includes coverage criteria that enable highly effective tests to be developed. A tool has been developed that uses UML state charts produced by Rational Software Corporation's Rational Rose tool to generate test data.