Lean Six Sigma Yellow Belt Certification Root Cause Analysis 4

Question 1

In the context of RCA, what does 'gemba' refer to?

Accepted Answer

Going to the actual place where the work is done to observe directly

Answer

'Gemba' means 'the real place' in Japanese and refers to going to where work actually happens to gather firsthand observations.

Question 2

A scatter diagram is used in root cause analysis primarily to:

Accepted Answer

Show the relationship or correlation between two variables

Answer

A scatter diagram plots two variables to reveal whether a correlation exists, which can help confirm or rule out potential causes.

Question 3

Which of the following statements about the 5 Whys technique is TRUE?

Accepted Answer

The number 5 is a guideline; you stop when the root cause is reached

Answer

The number 5 is a rule of thumb; the actual number of 'Why' questions asked depends on the complexity of the problem.

Question 4

A defect occurs only when a specific supplier's material is used. In a fishbone diagram, this most likely falls under which category?

Accepted Answer

Material

Answer

Supplier quality, raw materials, and components are classified under the 'Material' category in a fishbone diagram.

Question 5

When performing RCA, data stratification helps by:

Accepted Answer

Breaking data into subgroups to identify patterns or hidden causes

Answer

Stratification splits data by factors like shift, machine, or operator to reveal subgroup patterns that point to specific causes.

Lean Six Sigma Yellow Belt Certification Practice Test