Object Oriented approach to software development is decidedly a part of the mainstream simply because it has proven to be of value in buiding systems in all sorts of problem domains and encompassing all degrees of size and complexity.

The Unified modeling Language(UML) is a standard language for writing software blueprints. The UML may be used to visualize, specify, construct and document the artifacts of a software -intensive system. A modeling language is a language whose vocabulary and rules focus on the conceptual and physical representation of a system.Object-oriented analysis involves developing conceptual models of the problem domain of a software product. Object-oriented design involves developing models of the software solution to the problem clarified during analysis, and constructing programs that implement the design models.