ACCY 231 Chapter 4 - Chapter 4 Documentation DFD(data flow...

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Chapter 4: Documentation DFD(data flow diagram) and Flowchart 1. Physical DFD: --- a graphical representation of a system showing the system’s internal and external entities and the flows of data into and out of these entities 2. Logical DFD: --- a graphical representation of a system showing the system’s processes (as bubbles), data stores and the flows of data into and out of the processes and data stores 3. Differences between physical DFDs and logical DFDs --- physical DFDs specify where, how and by whom a system’s activities are accomplished while not showing what activities are being accomplished --- logical DFDs allow us to concentrate on the activities that a system performs --- a logical DFD portrays a system’s activities, whereas a physical DFD depicts a system’s infrastructure 4. Internal Entity: an entity within the system that transforms data.
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  • Three '12
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  • graphical representation, physical dfd, logical DFD

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