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PK0-005 Practice Question: The 100% rule in work breakdown structure (WBS)…
What is the 100% rule in work breakdown structure (WBS) creation?
⚠ Common exam trap
PK0-005 often tests whether candidates confuse the 100% rule (completeness of scope in the WBS) with other WBS principles like deliverable orientation or decomposition levels.
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
✓
The WBS must include all work required to complete the project scope.
The 100% rule states that the WBS must include 100% of the work defined by the project scope and capture all deliverables — internal, external, and interim — in terms of work to be completed. It also means that the sum of the work at the child level must equal 100% of the work at the parent level, with no work omitted and no extra work included. This ensures the WBS is a complete and accurate decomposition 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.
- ✗
The WBS must be deliverable-oriented.
Why it's wrong here
That is a characteristic of WBS, but not the 100% rule.
- ✗
The WBS must be decomposed to at least three levels.
Why it's wrong here
The 100% rule concerns completeness of scope, not depth; three levels is a common convention, not the rule's definition. It is tempting because decomposition depth is often discussed alongside WBS quality, and would be correct if the question asked about recommended WBS granularity.
- ✗
The WBS must be approved by the customer.
Why it's wrong here
The 100% rule concerns WBS decomposition completeness: child elements must capture 100% of the parent's scope, with no overlap or omission. Customer approval is a governance sign-off activity, not a decomposition rule. Approval would be relevant when establishing acceptance criteria or formal baselines, not when validating that work packages sum to the parent's scope.
- ✓
The WBS must include all work required to complete the project scope.
Why this is correct
The 100% rule requires the WBS to capture every deliverable and activity needed to fulfil the project scope, with no work omitted and no work beyond scope included. This guarantees complete decomposition, so nothing required for delivery is missed.
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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.