Lean Six Sigma Yellow Belt Certification FREE Lean Six Sigma Yellow Belt Control and Sustainment Methods Questions and Answers 2 — Questions and Answers
Question 1: Which document is primarily used to hand off a process improvement to the process owner during the Control phase?
- Control Plan (Correct answer)
- Project Charter
- SIPOC Diagram
- Value Stream Map
Correct answer: Control Plan
A Control Plan documents the methods and responsibilities needed to sustain improvements after the project team disbands.
Question 2: What is the purpose of a Standard Operating Procedure (SOP) in the Sustainment phase?
- To document the new process steps so all operators perform consistently (Correct answer)
- To identify root causes of defects
- To measure baseline process capability
- To prioritize improvement projects
Correct answer: To document the new process steps so all operators perform consistently
SOPs ensure every operator follows the same improved process steps, reducing variation and sustaining gains.
Question 3: In a control chart, what does a point falling outside the Upper Control Limit (UCL) indicate?
- Special cause variation is present (Correct answer)
- The process is in statistical control
- Common cause variation has decreased
- The specification limits need adjustment
Correct answer: Special cause variation is present
A point beyond the UCL signals special cause variation, meaning an assignable factor is affecting the process.
Question 4: Which sustainment technique involves scheduled reviews at 30, 60, and 90 days after implementation?
- Post-implementation audit (Correct answer)
- Gemba walk
- Kaizen event
- Tollgate review
Correct answer: Post-implementation audit
Post-implementation audits at set intervals verify that improvements remain effective and identify any performance drift.
Question 5: What is the primary risk if a Visual Management system is NOT implemented during the Control phase?
- Deviations from the improved process go unnoticed (Correct answer)
- The project charter becomes obsolete
- Fishbone diagrams lose accuracy
- DMAIC reverts to DMADV
Correct answer: Deviations from the improved process go unnoticed
Without Visual Management, operators and supervisors cannot quickly detect when the process drifts from its improved state.
Question 6: Which metric is most appropriate for monitoring whether a sustained process continues to meet customer requirements?
- Process Capability Index (Cpk) (Correct answer)
- Return on Investment (ROI)
- Net Promoter Score (NPS)
- Earned Value (EV)
Correct answer: Process Capability Index (Cpk)
Cpk measures how well a process output stays within customer specification limits, making it ideal for ongoing control monitoring.
