What Are the Differences Between Physical DFD and Logical DFD

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The Answer is The logical DFD is concerned with the processes that make up a system - essentially the question of WHAT is happening? In contrast,the physical DFD is focused on the entities that perform these processes - essentially the question of WHO is involved? So the bubbles in the logical DFD describe the processes and activities that occur within a system,while the bubbles in the physical DFD detail the entities involved in the system.Another difference to note between the logical and physical DFDs is the nature of the labels on the data flow arrows.In the physical DFD,these labels all referred to documents or physical items that flowed through the system.In the logical DFD,the flows tell us the type of information being sent.Also observe that,as in the physical DFD,the bubbles in the logical DFD are numbered.These numbers represent the order in which the processes occur,while the ones in the physical DFD indicate the order in which they take part in the process.

What Are the Differences Between Physical DFD and Logical DFD

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