Data flow diagrams evolve from the more general to the more detailed as current and replacement systems are better understood.

Question

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Data flow diagrams start with a high-level overview of the system and its processes, and then gradually become more detailed as the analyst gains a better understanding of the system's requirements and functions. This is known as a top-down approach, where the broader view is developed first and then broken down into smaller units.

Data Flow Diagrams Evolve from the More General to the More