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Complete Systems Analysis: The Workbook, the Textbook, the Answers by Tom DeMarco, James Robertson, Suzanne Robertson

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4.5. Solutions: Leveled Data Flow Diagrams

Exercise 1: Find the Leveling Problems

Here are the problems with the parent and child diagrams:

1. The child diagram should be called Diagram 3, not Diagram 1.

2. G is an output in the child, but an input in the parent diagram. It is either incorrectly drawn in one of the diagrams, or the analyst is confused about the use of this piece of data.

3. B is shown as an input to the child Diagram 3, but the parent diagram shows ...

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