An important guideline to follow when creating data flow diagrams is to show only one system entity even when several of them perform the same tasks.

Name: An important guideline to follow when creating data flow diagrams is to show only one system entity even when several of them perform the same tasks.
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Data flow diagrams should only show one system entity, even if multiple entities perform the same tasks. This is to avoid cluttering the diagram and to make it easier to understand the flow of data.

An Important Guideline to Follow When Creating Data Flow Diagrams