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A Data flow diagram (DFD) is used to express system requirements in a graphical form. It is also known as a bubble chart. A DFD depicts information flow and transform that are applied as data moves from input. Use of DFD helps to clarify the system requirements. DFD are drawn surging analysis and are the starting point for the design phase. A DFD could be used represent a physical system, at the beginning of analysis, or a logical system at alter point in the system development life cycle. Being graphical, it is easy to understand.
A DFD is used to describe what data flows rather how if flows. The concern is understanding the transforms that are required that are required to convert the input to output. It is independent of hardware, software, data structure and file organization.
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