PAM was established byHitachiOne proposedSoftware development method。PAM method hopes to give consideration to Yourdon method, Jackson method and bottom-up methodSoftware development methodTo avoid their disadvantages.Its basic idea is to consider the input and outputdata structure, guide the decomposition of the systemsystems analysisGradually synthesize under guidance.The specific steps of this method are: from input to outputdata structureexportBasic processingBox;Analyze the order of these processing boxes;Gradually synthesize the boxes according to the sequence until the PAD diagram of the whole system is drawn.From the above steps, it can be seen that this method is essentially a comprehensive bottom-up method, but it has been purposefully decomposed before synthesis, which is to fully consider the input and output of the systemdata structure。
Another advantage of the PAM approach is the use of PAD diagrams.This is a two-dimensional tree structure diagram, which is the bestdetailed design It is one of the representation methods, which is far superior to NS diagram and PDL language.
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This method is used inJapanIt is popular, and the success rate of software development is also high.Due to input and outputdata structureThere is also a gap with the whole system, and this method is still only applicable to small and medium-sized problems.
