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A data flow diagram is a graphic representation of a system or portion of system. It consists of data flows, processes, sources, destinations, and stores - all described through the use of easily understood symbols. An entire system can be described from the viewpoint of the data it processes with only four symbols. At the same time, data flow diagrams are powerful enough to show parallel activities. When standard symbols limit communication, a presentation graph, which uses symbols of people, files, terminals, and documents, can be used to discuss a system with users. DFD Principles * The general principle in Data Flow Diagramming is that a system can be decomposed into subsystems, and subsystems can be decomposed into lower level subsystems, and so on. * Each subsystem represents a process or activity in which data is processed. At the lowest level, processes can no longer be decomposed. * Each 'process' (and...

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