問48
頻出度★★★
プロジェクトマネジメントにおける WBS の作成に関する記述のうち, 適切なものはどれか。
平成30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
Incorrectア
The principle for how finely to break down the lowest-level work (work packages) is to decompose it to a granularity that can be estimated and managed; a fixed criterion such as “work that one person can definitely complete in one day” does not exist in the definition of a WBS. Because the depth of decomposition varies with the scale and nature of the project, this description is inappropriate.
Incorrectイ
A WBS is a top-down method that starts from the deliverables at the top and decomposes downward. The bottom-up explanation of “defining higher-level work by stacking up the smallest units of work one by one” is the reverse of the WBS creation procedure, so it is inappropriate.
- ウ
正解 A WBS (Work Breakdown Structure) places the project “deliverables” at the top level and decomposes the work needed to produce those deliverables top-down, step by step, until each piece reaches a manageable size. Therefore choice ウ, which says to “decompose and define the work needed to produce the deliverables”, correctly expresses the idea behind creating a WBS. By identifying work in a deliverable-oriented way, you can prevent missing tasks and clarify the scope.
Incorrectエ
The depth of the WBS hierarchy (the number of decomposition levels) is a result of breaking things down to an appropriate granularity according to the nature of each deliverable or task, so it may differ from one part to another. The statement that “everything within a single project is defined at the same hierarchical depth” is incorrect.
ここがポイント
- A WBS (Work Breakdown Structure) is deliverable-oriented: it decomposes and defines the work needed to produce the deliverables top-down, step by step.
- The depth of decomposition (number of levels) goes only until a manageable granularity is reached; it may differ from part to part and is not uniform.
用語