As a rule of thumb,no data flow diagram should have more than about seven processes on it,because the diagram would be too crowded and difficult to understand.

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Quizplus · Accepted Answer

This is true. Generally, a data flow diagram should be easy to read and understand, and having too many processes on it can make it confusing and overwhelming for the viewer. Therefore, it is recommended to keep the number of processes to no more than seven on each diagram.

As a Rule of Thumb,no Data Flow Diagram Should Have