Up to this point, you seem to have had excellent rapport with Kevin Cahoon, the owner of a musical instrument manufacturing company. When you showed him a set of data flow diagrams you drew, he wasnt able to see how the system you were proposing was described in the diagrams.

1. In a paragraph, write down in general terms how to explain a data flow diagram to a user. Be sure to include a list of symbols and what they mean.

2. It takes some effort to educate users about data flow diagrams. Is it worthwhile to share DFDs with users? Why or why not? Defend your response in a paragraph.

3. Compare data flow diagrams to use cases and use case scenarios. What do data flow diagrams show that use case diagrams have a difficult time trying to explain?