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. Th....

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