Systems documentation is important in preserving the corporate memory of the process. A representation of the system of interest and the entities that provide inputs to, or receive outputs from, the system of interest is referred to as a:单项选择题
A
physical DFD.
B
logical DFD.
C
context diagram.
D
systems flowchart.

Question

Systems documentation is important in preserving the corporate memory of the process. A representation of the system of interest and the entities that provide inputs to, or receive outputs from, the system of interest is referred to as a:单项选择题

A

physical DFD.

B

logical DFD.

C

context diagram.

D

systems flowchart.

BlackTom AI · Accepted Answer

A context diagram is a top-level data-flow diagram that shows the system of interest as a single process and the external entities that provide inputs to or receive outputs from that system.

1. Relevant knowledge points and concepts
- Data Flow Diagram (DFD): a modeling tool that represents processes, data stores, data flows, and external entities.
- Context diagram: the highest-level DFD that depicts the entire system as one process and only its interactions (inputs/outputs) with external entities.
- Logical DFD: shows what the system does (processes and data flows) without implementation details.
- Physical DFD: shows how the system is implemented (hardware, software, files, people).
- Systems flowchart: a diagram that shows the sequence of operations, control flow, and physical movement of data, often at a lower/implementation level.

2. Step-by-step reasoning
- The prompt specifies "a representation of the system of interest and the entities that provide inputs to, or receive outputs from, the system of interest." That description matches a diagram whose primary purpose is to show system boundaries and external interactions.
- A context diagram represents the entire system as a single bubble/process and explicitly labels external entities and the input/output flows between them and the system.
- Logical and physical DFDs show internal processes in more detail; a logical DFD decomposes processes into sub-processes and a physical DFD includes implementation details — neither is limited to just the system-as-one-process plus external entities.
- A systems flowchart focuses on control flow and procedural steps rather than the boundary-level input/output relationships emphasized here.

3. Calculations/intermediate steps
- Map description → "system as a single process + external entities" → definition of context diagram.

4. Why the correct answer is correct
- The context diagram’s defining characteristic is representing the system as a single node and showing all external entities that interact with it, exactly matching the wording in the question.

5. Why other options are incorrect
- Physical DFD: includes implementation details, not just boundary interactions.
- Logical DFD: decomposes internal processes and shows internal data flows, not just the external context.
- Systems flowchart: shows procedural and control details, not the boundary-level external-entity view.

Conclusion: The correct answer is context diagram. This matches the provided answer.

Systems documentation is important in preserving the corporate memory of the process. A representation of the system of interest and the entities that provide inputs to, or receive outputs from, the system of interest is referred to as a:单项选择题

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