Question: 7 . 1 9 What is a DFD ? Why do systems analysts use DFDs ? 7 . 2 0 Explain the rules for drawing

7.19 What is a DFD? Why do systems analysts use DFDs?
7.20 Explain the rules for drawing good DFDs.
7.21 What is decomposition? What is balancing? How can you determine if DFDs are not balanced?
7.22 Explain the convention for naming different levels of DFDs.

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