2) Unified Modelling Language Unified Modelling Language (UML)

is a well-defined easy to express powerful and universally applicable modelling language. Its scope is not limited to supporting object-oriented analysis and design but also supports the whole process of software development starting with requirements analysis.The structure of UML: The structure of UML consists of the basic building blocks the rules that govern how these building blocks are put together (the architecture) and a number of mechanisms that apply to the whole of UML.