The advantage of a physical data flow diagram versus a logical data flow diagram is that we can concentrate on what activities a system is performing without having to specify how, where or by whom..

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A logical data flow diagram focuses on what activities a system performs without specifying how, where, or by whom, while a physical data flow diagram includes details about how the system is implemented, including hardware, software, files, and people involved.

The Advantage of a Physical Data Flow Diagram Versus a Logical