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
What is the MAIN risk of setting control limits too wide on an X-bar chart?
Answer: Real process shifts may not be detected until many defects are produced
Overly wide control limits reduce the chart's sensitivity, meaning actual process deterioration may go undetected for an extended period, increasing defect output.
Which metric is MOST appropriate for tracking long-term process capability in the Control phase?
Answer: Cpk (process capability index)
Cpk measures ongoing process capability relative to specifications while accounting for process centering, making it the standard metric for monitoring sustained capability.
An I-MR chart is used instead of an X-bar and R chart when:
Answer: Only one measurement per time period is practical or available
Individuals and Moving Range (I-MR) charts are designed for situations where subgroup sampling is not feasible and only a single observation is available per time period.
A project benefit realization review is typically conducted to:
Answer: Confirm that the financial savings projected during the project were actually achieved
A benefit realization review validates that the anticipated financial and operational benefits (savings, quality improvements) actually occurred after project implementation.
In a control plan, the 'reaction plan' column is triggered when:
Answer: A measurement exceeds the control limit or action threshold
The reaction plan activates when a control measurement signals an out-of-control or out-of-specification condition, providing a predefined escalation and correction sequence.
Which of the following best describes a 'holding the gains' strategy in Lean Six Sigma?
Answer: Using a combination of SOPs, control charts, audits, and training to prevent regression to the old process
Holding the gains uses multiple overlapping controls — documentation, monitoring, training, and periodic audits — to prevent natural organizational drift back to old habits.
When transferring a completed DMAIC project to the process owner, the handoff package should EXCLUDE:
Answer: All raw data and statistical analyses from every phase
The handoff package should include actionable control documents and context, but voluminous raw phase data is typically archived rather than transferred since it is not needed for day-to-day process management.