CAPM Predictive Plan-Based Methodologies Practice Question
A project manager needs to decompose the project scope into smaller, more manageable components to provide a framework for detailed planning. Which technique should the project manager use?
⚠ Common exam trap
CAPM often tests the confusion between scope-decomposition tools (WBS) and scheduling/responsibility tools (Gantt, CPM, RACI), so candidates must anchor on the phrase 'decompose scope into manageable components.'
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)
A Work Breakdown Structure (WBS) is the PMBOK-defined tool for progressively decomposing total project scope into smaller, manageable deliverables called work packages. It provides the hierarchical framework that all subsequent planning (cost, schedule, risk, resources) is built upon. The WBS is deliverable-oriented and represents 100% of the scope — no more, no less.
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 matrix
Why it's wrong here
A RACI matrix assigns responsibility, accountability, consultation and information roles across activities; it does not decompose scope into work packages. It is tempting because RACI genuinely suits clarifying stakeholder roles during execution, where ambiguous ownership causes delays and rework.
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Critical Path Method (CPM)
Why it's wrong here
CPM sequences activities and calculates float along the longest path; it does not break scope into a hierarchy of deliverables. It is tempting because CPM genuinely suits schedule development, where identifying the critical path determines project duration and where float can be consumed.
- ✓
Work Breakdown Structure (WBS)
Why this is correct
The WBS hierarchically decomposes total project scope into deliverables and work packages, giving the structured framework detailed planning requires. Unlike activity lists or network diagrams, it defines scope boundaries rather than schedules, satisfying the stem's need to break scope into manageable components before estimating, assigning responsibility, or controlling change.
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Gantt chart
Why it's wrong here
A Gantt chart displays scheduled activities against a timeline; it presents work already decomposed rather than performing the decomposition. It is tempting because Gantt charts genuinely suit communicating schedule progress to stakeholders, where bar lengths and dependencies show planned versus actual dates.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official PMI exam blueprint
This CAPM practice question is part of Courseiva's free PMI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAPM exam.