What is the name of the highest-level DFD that shows the system as a single process?

Question

BlackTom AI · Accepted Answer

A Context Diagram represents the entire system as a single process and is the highest-level DFD.

Relevant knowledge points and concepts:
- Data Flow Diagrams (DFDs) are hierarchical visual models that represent how data moves through a system.
- Levels of DFDs: the Context Diagram (sometimes called Level 0), Level 1, Level 2, etc. Each deeper level decomposes processes into greater detail.
- External entities (sources/sinks), data flows, and data stores are standard DFD elements. The Context Diagram typically shows only the single system process, external entities, and data flows between them.

Step-by-step reasoning:
1. Identify what “highest-level DFD” means: it must present the system at the broadest possible scope without internal decomposition.
2. Recall standard DFD naming: the highest-level diagram that treats the system as one process is called the Context Diagram (or Level 0). It abstracts all internal processes into a single bubble representing the whole system.
3. Contrast with Level 1 and Level 2: Level 1 decomposes the single bubble into major sub-processes and internal data stores; Level 2 decomposes Level 1 processes further into more detailed sub-processes.
4. Recognize Physical DFD: a Physical DFD shows implementation details (who, where, how) — not the highest-level conceptual view of the system as one process.

Why the correct answer is correct:
- The Context Diagram shows the system as a single process and maps interactions with external entities and data flows, fulfilling the definition of the highest-level DFD.

Why the other options are incorrect:
- Level 1 DFD: Not highest-level — it breaks the system into multiple processes and shows internal data stores.
- Level 2 DFD: More detailed still; it is lower in the hierarchy than Level 1.
- Physical DFD: Focuses on implementation details (devices, files, people) rather than the top-level single-process abstraction.

Conclusion: The correct answer is Context Diagram, which matches the provided answer.

What is the name of the highest-level DFD that shows the system as a single process?单项选择题

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