PMP Question #1113: Real Exam Question with Answer & Explanation

Question

A construction company recently won the bid for a project to build a cable bridge. A project charter has been prepared and a project manager has been assigned. The project manager is creating a work breakdown structure (WBS) for the project. To what level should the project manager decompose their project?

Options

• ATo the lowest level where cost and duration can be estimated and managed
• BTo the level where the highest level of quality is maintained
• CTo level four of the schedule for bridge construction
• DTo the level where the bridge can be constructed safely

Explanation

A Work Breakdown Structure should be decomposed to a level where each work package is small enough for effective estimation of cost and duration, and for manageable assignment and control.

Common mistakes.

• B. While quality is crucial, it's not the primary driver for WBS decomposition levels; rather, quality is managed within the defined work packages.
• C. To "level four of the schedule" is an arbitrary and non-standard measure for WBS decomposition, as the appropriate level varies by project complexity and detail needed.
• D. Safety is a critical consideration for construction but doesn't define the level of decomposition for managing the project work itself; rather, safety measures are integrated into work package execution.

Concept tested. Work Breakdown Structure (WBS) decomposition

Reference. https://www.pmi.org/learning/library/work-breakdown-structure-wbs-project-management-7313

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