PK0-005 Project Life Cycle Practice Question
A project team is decomposing the project scope into work packages. Which of the following best describes the purpose of a Work Breakdown Structure (WBS)?
⚠ Common exam trap
PK0-005 often tests the confusion between the WBS and the schedule or risk register; candidates must remember that the WBS is strictly about scope decomposition, not timing, risk, or communication.
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
✓
To provide a hierarchical representation of all work required to complete the project deliverables
A Work Breakdown Structure (WBS) is a deliverable-oriented hierarchical decomposition of the total scope of work required to complete the project. It breaks the project down from the final deliverable into progressively smaller, more manageable components called work packages. This provides the foundation for estimating, scheduling, and assigning responsibility.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
To provide a hierarchical representation of all work required to complete the project deliverables
Why this is correct
The WBS decomposes the total project scope into progressively smaller, manageable work packages, giving a hierarchical view of every deliverable and its associated work. This directly satisfies the need to break scope down into work packages for planning and control.
- ✗
To list all project risks and their responses
Why it's wrong here
A WBS decomposes scope into deliverables and work packages; risk identification is performed in risk management processes and recorded in a risk register. Listing risks and responses is correct when planning risk responses, not when breaking down scope, so this fails the decomposition requirement stated in the stem.
- ✗
To identify the critical path of the project schedule
Why it's wrong here
Critical path identification happens during schedule development, using network diagram dependencies and durations, not during scope decomposition. A WBS structures deliverables and work packages hierarchically. Identifying the critical path is correct when analysing schedule float and determining the longest dependent sequence of activities.
- ✗
To define the communication channels among stakeholders
Why it's wrong here
Communication channels are defined in the communications management plan, which records stakeholder information needs, formats and frequency. A WBS decomposes scope into deliverables and work packages. Defining communication channels is correct when planning stakeholder engagement, not when structuring project scope hierarchically.
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Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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