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PK0-005 A project manager is creating the WBS Practice Question
A project manager is creating the WBS. Which rule ensures that all deliverables and work required for the project are included in the WBS and no work is omitted?
⚠ Common exam trap
PK0-005 often tests the difference between the 100% rule and decomposition; candidates may confuse the two because both relate to WBS construction, but only the 100% rule guarantees completeness.
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
✓
100% rule
The 100% rule in project management states that the WBS includes 100% of the work defined by the project scope and captures all deliverables—internal, external, interim—in terms of work to be completed. It ensures no work is omitted and no extra work is included, providing a complete and accurate representation of the project scope.
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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Rolling wave planning
Why it's wrong here
Rolling wave planning progressively elaborates deliverables over time; it does not guarantee completeness, which the 100% rule enforces. It is tempting because it is a legitimate WBS technique for uncertain scope, and it would be correct when later phases cannot yet be decomposed in detail.
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Scope verification
Why it's wrong here
Scope verification is the process of formally accepting completed deliverables with the customer, occurring after work is performed, so it cannot ensure the WBS captures all required work during creation. It is tempting because it also addresses scope completeness, but it would be the correct choice when validating that delivered outputs meet acceptance criteria.
- ✓
100% rule
Why this is correct
The 100% rule states that the WBS must capture all deliverables and work within scope, neither more nor less, at every decomposition level. This directly enforces completeness and prevents omitted work, matching the stem's requirement.
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Decomposition rule
Why it's wrong here
Decomposition describes subdividing deliverables into smaller, manageable work packages; it is a technique applied while building the WBS, not the rule guaranteeing 100% inclusion of scope. It would be the correct choice when the question asks how work packages are progressively broken down to a manageable level.
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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 CompTIA exam blueprint
This PK0-005 practice question is part of Courseiva's free CompTIA 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 PK0-005 exam.