Lean Six Sigma Yellow Belt Certification Root Cause Analysis 5

Question 1

Which of the following is an example of a 'containment action' as opposed to a 'corrective action'?

Accepted Answer

Quarantining suspect inventory to prevent defective products from reaching customers

Answer

A containment action is a short-term fix to stop defects from reaching customers while the root cause is being investigated.

Question 2

A team using a fishbone diagram places 'no standard operating procedure exists' under which category?

Accepted Answer

Method

Answer

Standard operating procedures (SOPs) govern how work is done, so their absence is a 'Method' category issue.

Question 3

Which of the following BEST differentiates root cause analysis from troubleshooting?

Accepted Answer

RCA seeks the systemic origin to prevent recurrence; troubleshooting restores function quickly

Answer

Troubleshooting focuses on restoring normal operation quickly, while RCA aims to permanently eliminate the underlying cause.

Question 4

A Lean Six Sigma team notices that defects spike whenever a new batch of reagent is introduced. The MOST appropriate next step in RCA is to:

Accepted Answer

Conduct a designed experiment comparing reagent batches to confirm the cause

Answer

Conducting a controlled experiment on reagent batches confirms whether the material is truly the cause before implementing a permanent fix.

Question 5

In root cause analysis, 'why-why analysis' and '5 Whys' are considered:

Accepted Answer

The same iterative cause-finding approach

Answer

'Why-why analysis' is simply another name for the 5 Whys — both describe iteratively asking why to drill down to the root cause.

Lean Six Sigma Yellow Belt Certification Practice Test