3.5. Review: Selling the Airtime

The Data Flow Diagram As a Recording Device

During your early interviews with the users, the data flow diagram can serve as a note-taking device. As people talk, draw processes and data flows. Your diagrams won’t be great art, but they nevertheless have a use. You capture what the users said, and immediately afterward confirm that you have the correct interpretation of what they said.

For example, the model in Figure 3.5.1 shows that bubble 3.4 SET SALES POLICY RATES updates the BREAKCHART with BREAK MINIMUM RATE. You show this model to Stamford Brook, sales manager, and ask him, “Is this right? Is it true that ...

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