Software process model involves 2 categories generic and iterative. Generic method includes 3 main methods which are waterfall, evolutionary and component based software engineering (CBSE). Moreover, iterative consist of 2 main method that happen to be incremental delivery and spiral delivery. Then emphasis of the report will be on Iterative and Incremental method  The Iterative and Incremental method, was introduced by Mr. Harlen Mills In 1970s. The technique..