Lean Six Sigma Green Belt Certification FREE Lean Six Sigma Green Belt DMAIC: Improve and Control Questions and Answers 2 — Questions and Answers
Question 1: Which tool is most commonly used in the Improve phase to identify the optimal settings for key process variables?
- Design of Experiments (DOE) (Correct answer)
- Control Chart
- Pareto Chart
- SIPOC Diagram
Correct answer: Design of Experiments (DOE)
Design of Experiments systematically varies input factors to determine their effect on outputs and identify optimal process settings.
Question 2: What is the primary purpose of a control plan in the Control phase of DMAIC?
- To document the system for monitoring and controlling key process variables (Correct answer)
- To identify root causes of defects
- To define the project scope
- To collect baseline data
Correct answer: To document the system for monitoring and controlling key process variables
A control plan documents the methods and responsibilities for monitoring key inputs and outputs to sustain improvements.
Question 3: In the Improve phase, what does a pilot test help the team accomplish before full-scale implementation?
- Validate the proposed solution on a small scale to identify risks (Correct answer)
- Establish the project charter
- Create a value stream map
- Calculate the process sigma level
Correct answer: Validate the proposed solution on a small scale to identify risks
A pilot test validates solutions in a controlled, small-scale environment to reduce risk before broader rollout.
Question 4: Which type of control chart would be most appropriate for monitoring the number of defects per unit after implementing improvements?
- U-chart (Correct answer)
- X-bar and R chart
- P-chart
- I-MR chart
Correct answer: U-chart
A U-chart tracks the number of defects per unit when sample sizes may vary, making it ideal for monitoring defect rates.
Question 5: What is the purpose of conducting a Failure Modes and Effects Analysis (FMEA) during the Improve phase?
- To prioritize potential failures by severity, occurrence, and detection before implementing solutions (Correct answer)
- To map the current state of the process
- To calculate the cost of poor quality
- To verify measurement system accuracy
Correct answer: To prioritize potential failures by severity, occurrence, and detection before implementing solutions
FMEA evaluates potential failure modes and ranks them by Risk Priority Number to prioritize preventive actions before implementation.
Question 6: What does Statistical Process Control (SPC) primarily help a team detect during the Control phase?
- Special cause variation indicating the process has shifted out of control (Correct answer)
- Common cause variation that is inherent to the process
- The average cycle time of the process
- The total number of defects produced
Correct answer: Special cause variation indicating the process has shifted out of control
SPC uses control charts to detect special cause variation, signaling that the process has deviated from its stable, improved state.
Lean Six Sigma Green Belt Certification FREE Lean Six Sigma Green Belt DMAIC: Improve and Control Questions and Answers 2
Which tool is most commonly used in the Improve phase to identify the optimal settings for key process variables?