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WebA data flow diagram (DFD) is a graphical or visual representation using a standardized set of symbols and notations to describe a business's operations through data movement. … WebMar 20, 2024 · They are the same thing – use cases are process models using the DeMarco and Yourdon notation; and DFD's are process models using the Gane and Sarson notation. 11. Process models are only used to document the current system (that is, the “as-is” system), since that is the system the users know and is the system that will be modified. WebApr 1, 2024 · A data flow diagram is typically organized hierarchically, showing the entire system at one level, followed by major subsystems at the next. Finally, details are shown for each primary subsystem, with … hags automotive