O'Reilly logo

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

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

4.4. Solutions: More on Data Flow Diagrams

Exercise 1: Any Defects?

The errors, in no particular order, found in Figure 2.6.15 are these:

1. All but one of the data flows have a single-character name; these should be replaced with clearly functional names.

2. Bubble 3 has no output. There is no reason for a process to have input but no output.

3. Bubble 4 has no input. Apart from a random number generator, or the production of pure fiction, processes must have some kind of data input to transform into their output.

4. The data flow SOMETHING TO DO WITH INVOICES is badly named. It appears ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required