A data flow diagram (DFD) is a graphical representation of the flow of data between processes. DFDs are used in the preliminary stages of systemsanalysis to help understand the current system and to represent a required system. Data flow diagrams (DFDs) are the method of choice over technical descriptions for three principal reasons:-
DFDs are easier to understand by technical andnontechnical audiences.
DFDs can provide a high level system overview, complete with boundaries and connections to other systems.
DFDs can provide a detailed representation of system components.
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