Object Oriented Analysis 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, Object Oriented Analysis & Design, Edward Yourdon and Carl Argila state “There was no concept of reusability, interchangeability of parts, or for that matter, formal design.” The systems were difficult to maintain or enhance, and became more and more difficult with each change. During the 1960’s, there were efforts to create more maintainable software, and in a more predictable fashion. The waterfall approach, as it was called, required that a number of formal phases be completed in the process of developing a software system. This approach required a lot of documentation, as completio....

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