PK0-005 Tools and Documentation Practice Question
During a quality audit, the project team discovers that 80% of customer complaints are caused by 20% of the defect types. Which quality tool should the project manager use to present this data and prioritize corrective actions?
⚠ Common exam trap
PK0-005 often tests the confusion between Pareto charts (prioritization by frequency, 80/20 rule) and cause-and-effect diagrams (root cause identification) or control charts (process stability over time).
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
✓
Pareto chart
A Pareto chart is the correct tool because it combines a bar chart of defect frequencies (ordered from highest to lowest) with a cumulative percentage line, visually demonstrating the 80/20 principle. It helps the project manager prioritize corrective actions by focusing on the 20% of defect types causing 80% of complaints.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Scatter diagram
Why it's wrong here
A scatter diagram shows correlation between two continuous variables, not the ranked frequency of defect categories. It is tempting because it is a quality tool that reveals relationships, and it would be the correct choice if the team needed to test whether one variable influences another rather than prioritise defect types.
- ✗
Control chart
Why it's wrong here
A control chart tracks process stability over time against control limits; it does not display defect categories ranked by contribution. It is tempting because it is a quality tool used during audits, and it would be the correct choice if the requirement were detecting whether a process is statistically in or out of control.
- ✓
Pareto chart
Why this is correct
A Pareto chart ranks defect categories by frequency in descending bars with a cumulative line, exposing the 80/20 concentration. This lets the project manager visually justify focusing corrective action on the few defect types causing most complaints, exactly as the audit data shows.
- ✗
Cause-and-effect diagram
Why it's wrong here
A cause-and-effect diagram maps potential causes to an effect but does not rank defect types by frequency or cumulative percentage. It is tempting because it drives corrective action planning, and it would be the correct choice if the team needed to brainstorm root causes rather than present Pareto data.
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JA
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.