問48
頻出度★★★
プロジェクトで実施する作業の順序設定に関して，次の記述中の a，b に入れる字句の適切な組合せはどれか。 成果物を作成するための作業を，管理しやすい単位に [ a ] によって要素分解し，それらの順序関係を [ b ] によって表示する。
平成29年度 春期 ITパスポート試験 問48
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 48
- ア
正解 Blank a asks for the technique to decompose the work for creating the deliverables into manageable units, which is the WBS (Work Breakdown Structure) that hierarchically breaks the work down so nothing is missed. Blank b asks for the technique to show the order (predecessor-successor) relationships among the activities, which is the Arrow Diagram (PERT chart) that links activities with arrows to depict their predecessor-successor dependencies. Therefore option ア, with a=WBS and b=Arrow Diagram, is correct.
Incorrectイ
a=WBS is correct, but the Pareto chart in b is one of the seven QC tools: it arranges defect or problem items in bars from most to fewest occurrences and shows the cumulative ratio as a line, used to identify the items that deserve priority control. It is not a chart that shows the order relationships among activities, so it is wrong.
Incorrectウ
b=Arrow Diagram is correct, but the Gantt chart in a is a progress-management chart that shows the start/end timing and progress of each activity as horizontal bars on a time axis; it is not a technique for decomposing work into manageable units. It is the WBS that plays the decomposition role, so it is wrong.
Incorrectエ
The Gantt chart in a is not a decomposition technique but a chart for progress and schedule management, and the Pareto chart in b is a QC chart for identifying priority items; neither matches what the question asks for, namely decomposition and showing order relationships, so both are wrong.
ここがポイント
- Keep the roles distinct: the WBS hierarchically decomposes the work for creating the deliverables down to manageable units, while the Arrow Diagram (PERT chart) uses arrows to express the predecessor-successor order relationships among activities.
- Do not confuse them: the Gantt chart is for progress and schedule management and the Pareto chart is for grasping priority items (one of the seven QC tools); these serve different purposes and are not used for work decomposition or for showing order.
用語