Control Phase and Sustainment Flashcards
7 cards from real Lean Six Sigma Green Belt Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Control Phase and Sustainment flashcards as text
A sustained improvement in a transactional process is BEST evidenced by:
Answer: A statistically significant shift in the process output metric sustained over 3-6 months post-implementation
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.
What does it mean when an individuals (I) chart shows a point outside the upper control limit (UCL)?
Answer: A special cause of variation has likely occurred
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.
Which of the following BEST describes the purpose of a lessons-learned document in the Control phase?
Answer: To capture knowledge from the project so future teams can avoid similar problems and replicate successes
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.
A team is choosing between a p chart and a c chart. The deciding factor is:
Answer: Whether they are counting defectives (units) or defects (per unit)
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).
The concept of 'process entitlement' in capability analysis refers to:
Answer: The best short-term capability the process has demonstrated under ideal conditions
Process entitlement is the best capability the process has ever achieved over a short period, representing its potential performance under ideal conditions.
During a process audit 6 months after project closure, the Green Belt finds operators are not following the new SOP. The FIRST action should be:
Answer: Understand WHY operators deviate before implementing additional controls
Understanding the root cause of non-compliance (e.g., unclear steps, tool unavailability, lack of training) is necessary before implementing effective corrective actions.
A control chart with very tight control limits relative to specifications suggests:
Answer: The process is highly capable and the measurement system may be too sensitive
When control limits are much tighter than specification limits, the process Cpk is high, indicating excellent capability with ample room between natural variation and customer tolerances.