Lean Six Sigma Green Belt Certification Control Phase and Sustainment 4

Question 1

A sustained improvement in a transactional process is BEST evidenced by:

Accepted Answer

A statistically significant shift in the process output metric sustained over 3-6 months post-implementation

Answer

True sustainment requires demonstrating that the improved performance has been maintained over a meaningful time horizon with statistical evidence, not just at a single point in time.

Question 2

What does it mean when an individuals (I) chart shows a point outside the upper control limit (UCL)?

Accepted Answer

A special cause of variation has likely occurred

Answer

A point outside the UCL on an individuals chart signals that a special cause has likely shifted the process, requiring investigation to identify and eliminate the root cause.

Question 3

Which of the following BEST describes the purpose of a lessons-learned document in the Control phase?

Accepted Answer

To capture knowledge from the project so future teams can avoid similar problems and replicate successes

Answer

A lessons-learned document captures what worked, what did not, and key insights so that organizational knowledge is retained and future projects benefit from the experience.

Question 4

A team is choosing between a p chart and a c chart. The deciding factor is:

Accepted Answer

Whether they are counting defectives (units) or defects (per unit)

Answer

A c chart tracks the count of defects per inspection unit (multiple defects possible per unit), while a p chart tracks the proportion of defective units (a unit is either defective or not).

Question 5

The concept of 'process entitlement' in capability analysis refers to:

Accepted Answer

The best short-term capability the process has demonstrated under ideal conditions

Answer

Process entitlement is the best capability the process has ever achieved over a short period, representing its potential performance under ideal conditions.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Control Phase and Sustainment 4