Discussion
What is the primary purpose of a Data Flow Diagram (DFD) ?
Answer: B
The purpose of a DFD is to represent data movement in a system.
A data flow diagram shows how data enters a system from external entities, passes between processes, is held in data stores and leaves as output, at levels from a context diagram down to detailed levels. It shows what happens to the data, not when or in what order.
Program logic and control flow are shown by flowcharts or pseudocode. Database schema is shown by ER diagrams. User interface design uses wireframes or mock-ups.
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