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PK0-005 Practice Question: A project team is creating a work breakdown…
A project team is creating a work breakdown structure (WBS) for a software development project. The project manager wants to ensure that all deliverables are identified and decomposed into manageable work packages. Which tool should the team use to represent the hierarchical decomposition of the work?
⚠ Common exam trap
Test-takers frequently confuse the WBS with a Gantt chart (Option D) because both are used in project planning, but the Gantt chart focuses on scheduling and dependencies, not hierarchical decomposition.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Work breakdown structure (WBS)
The Work Breakdown Structure (WBS) is the correct tool because it is specifically designed to represent the hierarchical decomposition of project deliverables into manageable work packages. This aligns directly with the project manager's goal of identifying all deliverables and breaking them down for the software development project.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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RACI chart
Why it's wrong here
A RACI chart maps roles and responsibilities against tasks, not deliverables into work packages. It is tempting because it also documents project work, but its axis is accountability per activity, whereas the WBS requires hierarchical decomposition of scope into manageable work packages.
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Risk register
Why it's wrong here
A risk register records identified risks, their probability, impact and responses; it holds no deliverable hierarchy. It is tempting because it is a core project artefact, but its axis is uncertainty management, whereas the WBS decomposes scope into manageable work packages.
- ✓
Work breakdown structure (WBS)
Why this is correct
A WBS is the only tool that hierarchically decomposes project scope into deliverables and work packages, directly satisfying the stem's requirement for manageable decomposition. Unlike a Gantt chart, which sequences activities over time, or a RACI matrix, which assigns responsibility, the WBS defines scope structure without scheduling or resourcing.
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Gantt chart
Why it's wrong here
A Gantt chart schedules activities against time; it does not decompose deliverables hierarchically. It is tempting because it also displays project work, but its axis is duration and sequencing, whereas the WBS represents scope decomposition into work packages.
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