Arrows is a flow chart that represents the order of events arrows in DFD represents flowing data. Remember that DFD is not a flow chart.This makes it easier to refer to elements in the DFD. The following observations about DFDs are essential: The DFD is also called as a data flow graph or bubble chart. It may be used as a communication tool between a system analyst and any person who plays a part in the order that acts as a starting point for redesigning a system. The objective of a DFD is to show the scope and boundaries of a system as a whole. It shows how data enters and leaves the system, what changes the information, and where data is stored. It can be manual, automated, or a combination of both. A neat and clear DFD can depict the right amount of the system requirement graphically. A Data Flow Diagram (DFD) is a traditional visual representation of the information flows within a system.
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