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- “Data flow diagrams and flowcharts provide redundant pictures of an Information System. We don’t need both.” Discuss.
- “It is easier to learn to prepare data flow diagrams, which use only a few symbols, than it is to learn to prepare flowcharts, which use a number of different symbols.” Discuss.
- Describe the who, what, where, and how of the following scenario: A customer gives his purchase to a sales
clerk, who enters the sale in a cash register and puts the money in the register drawer. At the end of the day, the sales clerk gives the cash and the register tape to the cashier.
- Why are there many correct logical DFD solutions? Why is there only one correct physical DFD solution?
- Explain why a flow from a higher- to a lower-numbered bubble on a logical DFD is a physical manifestation of the system. Give an example.
- Compare and contrast the purpose of and techniques used in drawing physical DFDs and logical DFDs.
- “If we document a system with a systems flowchart, data flow diagrams, and E-R diagrams, we have over-documented the system.” Discuss.
- “Preparing a table of entities and activities as the first step in documenting systems seems to be unnecessary and unduly cumbersome. It would be a lot easier to bypass this step
and get right to the necessary business of actually drawing the diagrams.” Do you agree? Why or why not?
- “In terms of the sequence used in documenting systems, it would be easier to prepare a systems flowchart before we prepare a data flow diagrams.” Do you
- “Since there are computer-based documentation products that can draw data flow diagrams and systems flowcharts, learning to draw them manually is a waste of time.” Do you agree?
Why or why not?