Rational Unified Process.

Rational Unified Process (RUP) is one of the most popular software development methodologies. RUP was created in 1988 by Rational Software Corporation at now obtain recognition of many software developers in the world. Based on the iterative Life Cycle Model RUP includes four phases: Inception, Elaboration, Construction and Transition. RUP is a use case driven development model. Use cases describe interactions between the users a system.