Lean Six Sigma Yellow Belt Certification Root Cause Analysis 2

Question 1

In a fishbone diagram, which category would 'outdated software version' fall under?

Accepted Answer

Machine

Answer

Software or equipment issues are classified under the 'Machine' (or Equipment) category in a fishbone diagram.

Question 2

Which of the following best describes a 'contributing cause' in root cause analysis?

Accepted Answer

A factor that increased the likelihood of the root cause occurring

Answer

A contributing cause is a factor that made the root cause more likely to occur but is not the root cause itself.

Question 3

A team uses the 5 Whys and reaches a conclusion that cannot be further questioned. This ending point is called the:

Accepted Answer

Root cause

Answer

The root cause is the deepest identifiable cause in a causal chain that, when corrected, prevents recurrence.

Question 4

Which tool is MOST effective for visually displaying the relationship between a problem and all its potential causes?

Accepted Answer

Ishikawa diagram

Answer

The Ishikawa (fishbone) diagram visually maps a problem to its potential causes across multiple categories.

Question 5

During root cause analysis, a team discovers the defect rate increases every Monday morning. What type of cause is this likely indicating?

Accepted Answer

Special cause

Answer

A recurring pattern tied to a specific condition (Monday mornings) is a special cause of variation, not random noise.

Lean Six Sigma Yellow Belt Certification Practice Test