Lean Six Sigma Yellow Belt Certification FREE Lean Six Sigma Yellow Belt Root Cause Analysis Questions and Answers 2 — Questions and Answers
Question 1: Which root cause analysis tool uses repeated questioning to drill down from a symptom to its underlying cause?
- 5 Whys (Correct answer)
- Pareto Chart
- Control Chart
- SIPOC Diagram
Correct answer: 5 Whys
The 5 Whys technique involves asking 'why' repeatedly until the fundamental cause of a problem is identified.
Question 2: In a Cause-and-Effect diagram, what does the 'head' of the fish represent?
- The root cause
- The effect or problem (Correct answer)
- The category of causes
- The corrective action
Correct answer: The effect or problem
The head of the fishbone diagram represents the problem or effect being analyzed, while the bones represent potential causes.
Question 3: What is a key limitation of the 5 Whys technique?
- It requires statistical software
- It can follow only one causal path at a time (Correct answer)
- It cannot be used in manufacturing
- It must always reach exactly five levels
Correct answer: It can follow only one causal path at a time
The 5 Whys tends to follow a single chain of causation, potentially missing other contributing root causes.
Question 4: Which category is NOT one of the traditional 6Ms used in an Ishikawa diagram?
- Manpower
- Machine
- Money (Correct answer)
- Method
Correct answer: Money
The traditional 6Ms are Manpower, Machine, Material, Method, Measurement, and Mother Nature (Environment), not Money.
Question 5: What is the primary purpose of a fault tree analysis in root cause analysis?
- To assign blame to individuals
- To map logical relationships between failures and their causes (Correct answer)
- To calculate production costs
- To schedule preventive maintenance
Correct answer: To map logical relationships between failures and their causes
Fault tree analysis uses Boolean logic to map how combinations of lower-level failures can lead to a top-level undesired event.
Question 6: After identifying a root cause, what should be verified before implementing a corrective action?
- That the cause, when removed, actually prevents recurrence of the problem (Correct answer)
- That the cause was documented in a Pareto chart
- That at least five team members agree on the cause
- That the cause appears in the control plan
Correct answer: That the cause, when removed, actually prevents recurrence of the problem
A true root cause is confirmed by verifying that removing or addressing it prevents the problem from recurring.
Lean Six Sigma Yellow Belt Certification FREE Lean Six Sigma Yellow Belt Root Cause Analysis Questions and Answers 2
Which root cause analysis tool uses repeated questioning to drill down from a symptom to its underlying cause?