Part one of term paper
During the 1950’s, era of computing, computer programs were created using ad hoc software development approach; each system a unique, custom-built intellectual product. In their book, & Design, Edward Yourdon and Carl Argila state “There was no concept of reusability, interchangeability of parts, or for that matter, formal design.” T ...

Part two of term paper
... a software system. This approach required a lot of documentation, as completion of each phase was accompanied by many documents. This approach had one major flaw: because of its strict sequence, nothing of substance could be demonstrated to the end user until the final stage of the waterfall cycle was completed. During the 1970’s, a new approach was developed. Tom Demarco, is his book, Structured Analysis and System Specification, introduced model-based software engineering. Demarco ...