問42
頻出度★★★
システム開発において使用するアローダイアグラムの説明として, 適切なものはどれか。
令和元年度 秋期 ITパスポート試験 問42
マネジメント系プロジェクトマネジメント › プロジェクトマネジメント
This question's explanation and your answers so far.
解説
問 42
Incorrectア
“A diagram that represents the flow of business data” describes a DFD (data flow diagram). It represents the generation, processing, storage, and flow of data, and its purpose differs from that of an arrow diagram, which represents the schedule and dependencies of tasks.
- イ
正解 An arrow diagram (also called a PERT chart, a schedule-planning technique) represents each task with an arrow and represents the connection points that serve as the start and end of tasks with circles (nodes), drawing the sequential and dependency relationships among tasks as a net-like network. This lets you grasp the overall flow of the work and the critical path (the longest path, i.e., the path that determines the required duration). The description in choice “イ,” “a diagram that represents the relationships among tasks as a network,” matches this definition exactly, so it is the correct answer.
Incorrectウ
“A diagram that places tasks on the vertical axis and represents the duration with horizontal bars” describes a Gantt chart. It visualizes the start, end, and duration of each task with a bar chart for progress management, which is different from an arrow diagram that represents dependencies among tasks as a network.
Incorrectエ
“A diagram that represents the relationships among data in software” describes data-modeling diagrams such as an E-R diagram (entity-relationship diagram). It represents the relationships among data (entities) and does not apply to an arrow diagram, which deals with task schedules.
ここがポイント
- Arrow diagram (PERT chart) = a schedule-planning technique that represents tasks with arrows and connection points with nodes, showing the sequential relationships among tasks as a network; used for critical path analysis.
- Distinguishing from similar diagrams: flow of data = DFD; a progress chart showing tasks as horizontal bars = Gantt chart; relationships among data = E-R diagram.
用語