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Introduction Structured Design is a method to convert an informal specification including a set of data flow diagrams and process specifications into a design that could be implemented using a language like Pascal or C It was developed by Edward Yourdon and Larry Constantine reportedly by examining a number of systems that had been developed in the 1960s that were regarded as good design examples and identifying common features and patterns that they contained Structured Design does not produce designs that have a number of desirable properties It doesnt take advantage of the newer features provided by object-oriented programming languages While structured design provides some limited support for encapsulation of data information hiding it doesnt really support inheritance or templates so it doesnt help you to take advantage of opportunities for reuse of software It doesnt produce designs that are suitable for highly interactive systems - that is systems which the user interacts with the system using a mouse as well as a terminal so that the user has more control over the order in which things are done than is generally provided by systems that use a command line interface or that rely on simple menus that could be used with a terminal rather than on a workstation or PC running a windowing system These simpler interfaces command line and simple menu based ones were the only ones in widespread use when this design method was developed It doesnt produce designs that are useful for real time systems or other systems in which performance requirements play a greater role than they do in more traditional business systems We will continue to assume as is still usually the case that its sufficient and therefore appropriate to design and implement without much consideration of performance requirements - and after that well perform tests that include performance tests in order to look for evidence that resource requirements havent been met find bottlenecks and
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