問36
頻出度★★★
プロジェクトで作成する WBS に関する記述のうち, 適切なものはどれか。
令和4年度 ITパスポート試験 問36
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 36
- ア
正解 A WBS (Work Breakdown Structure) is a diagram that hierarchically breaks down, in detail and without omissions, the deliverables to be produced in a project and the work that must be performed to achieve them. Because it is made concrete down to the lowest-level tasks (work packages), the effort, cost, and duration of each individual task can be added up to serve as the “basis” for estimation. Therefore choice ア, which says “a WBS defines the work content and deliverables to be performed, so it can be used as a basis for estimating work effort”, is appropriate.
Incorrectイ
A WBS takes only the deliverables and work within the project scope as objects of decomposition. If work outside the scope is included, work that need not be done gets drawn into the estimation and planning, causing scope creep (uncontrolled expansion of scope). “Considering and including” work outside the scope is inappropriate.
Incorrectウ
How finely a WBS is broken down (the depth of the hierarchy) is decided according to the project's size, complexity, and management needs, and the appropriate granularity differs for each deliverable and task. There is no fixed rule that “every project breaks down to the same level”, so asserting “all” and “to the same level” is the error.
Incorrectエ
A WBS must capture all work within scope without omission (the so-called 100% rule). Even similar tasks, or tasks that seem obvious to the person in charge, must be recorded as long as they are within scope; otherwise it leads to missed effort or gaps in management. “Need not be recorded” is inappropriate.
ここがポイント
- A WBS hierarchically breaks down and lays out a project's deliverables and work, and serves as the basis for estimating effort, cost, and schedule and for assigning responsibilities.
- A WBS includes all work within scope without omission under the 100% rule. The level of decomposition detail is adjusted per project, and work outside the scope is not included.
用語