Lean Six Sigma Green Belt Certification Cheat Sheet 2026

The 30 highest-yield Lean Six Sigma Green Belt Certification facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which two components of variation does a Gage R&R study measure? → Repeatability and Reproducibility
2. Which type of control chart would be most appropriate for monitoring the number of defects per unit after implementing improvements? → U-chart
3. A Lean Six Sigma project's authorized written plan detailing the anticipated advantages to the business and anticipated cost savings is known as a → Project business case
4. Which chart is most appropriate for tracking a single process metric over time to detect trends or shifts? → Run chart
5. What is the primary purpose of a Value Stream Map (VSM) in Lean methodology? → To visualize the flow of materials and information and identify waste
6. What does the %Tolerance method in Gage R&R analysis compare? → Measurement system variation as a percentage of the engineering specification tolerance
7. What is the significance of a Cp value greater than 1.33 in process capability analysis? → The process is considered capable with an adequate safety margin
8. In a cause-and-effect (fishbone) diagram, which of the following is NOT a traditional 6M category? → Money
9. A approach called "the voice of the customer" understanding is used to give customers: → Services and products that meet the customer expectations and needs
10. What does MSA stand for in the context of the Control phase? → Measurement System Analysis
11. What is the purpose of a measurement system analysis (MSA) in Six Sigma? → To evaluate the reliability and accuracy of a measurement system
12. In the context of process improvement, what does a low standard deviation signify? → The process data points are tightly clustered around the mean.
13. Which of the items below best illustrates how a SIPOC diagram develops? → Critical-to-Quality Requirements
14. What role does a cost-benefit analysis play in the Improve phase? → It quantifies the financial impact of proposed solutions to justify implementation
15. Which metric represents the acceptable range of variation a customer will tolerate? → Customer specification limits
16. In a 2^3 full factorial DOE, how many experimental runs are required? → 8
17. Which tool is most appropriate for identifying potential failure modes and their effects on a process? → Failure Mode and Effects Analysis (FMEA)
18. What is the relationship between process capability index Cp and specification width? → Cp = (USL - LSL) / (6 × standard deviation)
19. What is the formula for calculating Defects Per Million Opportunities (DPMO)? → (Defects / (Units x Opportunities)) x 1,000,000
20. Which concept in Lean manufacturing refers to building in quality at the source by stopping production immediately when a defect is detected? → Jidoka
21. In a cause-and-effect (Ishikawa) diagram, which of the following is a standard category used to classify potential causes? → Measurement
22. In a measurement system analysis, what does 'reproducibility' specifically evaluate? → Variation due to different operators measuring the same part
23. What is the purpose of a poka-yoke device in Lean manufacturing? → To mistake-proof a process so errors cannot occur or are immediately detected
24. What is the main difference between a control chart and a run chart? → Control charts include statistically calculated control limits
25. In a Measure phase data collection plan, what should be defined FIRST? → The operational definition of what is being measured
26. Which of these 5S's is predominantly driven by management, despite the fact that management of a company must set the framework for all improvement efforts? → Sustain
27. Which of the following is an essential component of a robust Data Collection Plan in the Measure Phase? → An operational definition of what is being measured.
28. In a Pareto chart, what principle guides the prioritization of problems? → The 80/20 rule states that roughly 80% of effects come from 20% of causes
29. Which of the following statements regarding the fitted line plot is true? → The predicted output Y is close to -18 when the Reactant level is set to 6.
30. Which Lean tool uses a visual board with columns such as To Do, In Progress, and Done to manage workflow? → Kanban board