Certified Six Sigma Black Belt Exam Voice of the Customer (VOC) 5 — Questions and Answers
Question 1: A Black Belt wants to understand how customers trade off price, delivery speed, and quality. Which advanced VOC technique is most appropriate?
- Conjoint analysis (Correct answer)
- Control charting
- Gage R&R study
- Box-Cox transformation
Correct answer: Conjoint analysis
Conjoint analysis presents customers with trade-off scenarios to reveal the relative importance they place on different product attributes.
Question 2: In the context of VOC, what does 'customer segmentation' allow a Six Sigma team to do?
- Eliminate low-value customers from the project scope
- Tailor CTQs and solutions to the distinct needs of different customer groups (Correct answer)
- Reduce the sample size required for statistical analysis
- Avoid collecting VOC from difficult-to-reach customers
Correct answer: Tailor CTQs and solutions to the distinct needs of different customer groups
Segmentation enables targeted CTQ development so that solutions genuinely address each group's specific requirements rather than a generic average.
Question 3: Which of the following is NOT a recommended practice when conducting customer interviews for VOC?
- Using open-ended questions to elicit detailed responses
- Probing vague answers with 'can you tell me more?'
- Suggesting possible answers to save the customer's time (Correct answer)
- Recording or note-taking with the customer's permission
Correct answer: Suggesting possible answers to save the customer's time
Suggesting answers introduces interviewer bias and anchors the customer's response, compromising the validity of the VOC data.
Question 4: A service company converts VOC data into CTQs and finds the CTQ is 'call resolved in first contact.' How should this be expressed as a measurable specification?
- Improve customer satisfaction scores
- First Contact Resolution (FCR) rate ≥ 85% (Correct answer)
- Reduce call volume by any amount
- Train agents to be more empathetic
Correct answer: First Contact Resolution (FCR) rate ≥ 85%
A valid CTQ specification must be quantifiable with a target value and direction, such as FCR ≥ 85%.
Question 5: The 'outside-in' thinking principle in Six Sigma VOC means:
- Projects should be initiated by external consultants, not internal teams
- Process improvements must be driven by customer requirements, not internal assumptions (Correct answer)
- VOC data should be collected outside company premises only
- External benchmarking always takes priority over internal metrics
Correct answer: Process improvements must be driven by customer requirements, not internal assumptions
Outside-in thinking ensures that the starting point for any improvement is what matters to the customer, not what is convenient internally.
Question 6: A Black Belt reviews customer satisfaction survey results showing a mean score of 7.2/10 with high variance. What does the high variance indicate?
- The mean score is unreliable and should be discarded
- Customer experiences are inconsistent, suggesting a process with high variation (Correct answer)
- The survey instrument is invalid and must be redesigned
- Customers are generally satisfied and no action is needed
Correct answer: Customer experiences are inconsistent, suggesting a process with high variation
High variance in satisfaction scores signals that the process delivers inconsistent customer experiences — a key Six Sigma improvement opportunity.
Question 7: Which phase of the DMAIC cycle is most closely associated with initial VOC collection and CTQ identification?
- Measure
- Analyze
- Define (Correct answer)
- Control
Correct answer: Define
The Define phase establishes the project scope using VOC data and translates customer needs into CTQs that guide the entire project.
Certified Six Sigma Black Belt Exam Voice of the Customer (VOC) 5
A Black Belt wants to understand how customers trade off price, delivery speed, and quality.
Which advanced VOC technique is most appropriate?