Dfd to Structure

May 1st, 2015
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Logical Design. Simplifies understanding “divide and conquer”. Allows parallel development Physical Design. Separately compilable modules one change should not require a complete build.

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Dfd to StructureDFD to Structure ChartsGeorgia State UniversityDFDs to Structure ChartsFirst Level Data Flow Diagram0 Library System1Book Catalog3 2Borrowers ListGeorgia State UniversityDFDs to Structure ChartsFunctional Decomposition0 Library System 1 2 32.12.2Georgia State UniversityDFDs to Structure ChartsStructure ChartStructure Chart Example Q: Where do the modules come from?Logical DesignExecutive Module 'Update File' Top because it calls all others none call it at this levelModule 1 e.g. ReadModule 2.. e.g. UpdateModule n e.g. WriteOpen FIleGeorgia State University DFDs to Structure ChartsStructure ChartStructure Chart Example Q: Where do the modules come from?Physical Design2Executive Module 'Update File' Top because it calls all others none call it at this level13Module n e.g. WriteModule 1 e.g. ReadModule 2.. e.g. UpdateOpen FIleGeorgia State University DFDs to Structure ChartsDFD to Structure Charts?0 Library System1Book Catalog?Module 1 e.g. Read Open FIleStructure Chart Example Q: Where do the modules come from?32Executive Module 'Update File' Top because it calls all others none call it at this levelModule 2.. e.g. UpdateModule n e.g. WriteBorrowers ListGeorgia State UniversityDFDs to Structure ChartsWhy Divide Things Up?Logical Design Simplifies understandingdivide and conquer Allows parallel developmentPhysical Design Separately compila

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