IASSC Certified Lean Six Sigma Black Belt (ICBB) — Question 34

Which of the following is not a disadvantage of the 5 Whys?

Answer options

• A. The 5 Whys can be subjective
• B. If the investigators do not possess enough skill and knowledge on the topic, they cannot find the causes of the problem
• C. The 5 Whys cannot be easily learnt and applied as it requires no statistical analysis
• D. The 5 Whys help to identify only one root cause of a problem

Correct answer: C

Explanation

Option C is correct because the 5 Whys method is actually straightforward and can be learned easily without needing statistical analysis. Options A, B, and D present valid disadvantages, as the method can indeed be subjective, requires knowledgeable investigators, and typically aims to identify only one root cause.