Lean Six Sigma Yellow Belt Certification Cheat Sheet 2026

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

1. A Pareto chart is not required when using a histogram for problem-solving: False or true → False
2. Which Define phase deliverable identifies all individuals or groups who may affect or be affected by the project? → Stakeholder analysis
3. Which Six Sigma concept refers to any activity that consumes resources but does not add value for the customer? → Waste
4. What is the purpose of a 'corrective action' following root cause identification? → To permanently eliminate the root cause and prevent recurrence
5. Process capability analysis compares: → The natural process spread to the customer specification width
6. What is the primary purpose of verifying the root cause before implementing a solution? → To ensure the fix addresses the actual source of the problem
7. On a control chart, what does it mean when a single data point falls beyond the Upper Control Limit (UCL)? → A special cause of variation is likely present
8. What is the appropriate response when a process displays only common cause variation but does not meet customer specifications? → Redesign or fundamentally change the process system
9. Which of the following is a primary waste identified in Lean methodology? → Overproduction
10. In a control chart, what does a data point outside the upper or lower control limit indicate? → Special cause variation requiring investigation
11. Which of the following is NOT typically included in a Project Charter? → Root cause analysis results
12. How does Lean Six Sigma work? → A process improvement method that combines elements of both Lean and Six Sigma.
13. In Lean, which of the following is an example of 'motion' waste? → An operator walking across the floor to retrieve a tool not stored at the workstation
14. Which of the following best illustrates 'visual management' in a sustained process? → Color-coded floor tape marking where materials should be stored
15. During a process audit in the Control phase, an auditor finds operators are skipping a step defined in the SOP. The BEST immediate action is to: → Retrain operators and investigate why the step is being skipped
16. Which of the following is a visual management tool commonly used to sustain Control phase improvements? → 5S workplace organization
17. Which brainstorming technique involves writing ideas on sticky notes silently before group discussion? → Brainwriting
18. What does a 'future state' value stream map represent in the Improve phase? → The ideal process design after waste is eliminated
19. What is the role of a Yellow Belt in a Lean Six Sigma organization? → Serve as subject matter experts and support Green/Black Belt projects
20. Which of the following would give benefits and working conditions the most consideration? → Voice of the Employee
21. Which type of waste occurs when employees spend time searching for tools or information? → Motion
22. Which Define phase tool is used to identify and prioritize customer needs by translating VOC data into specific, measurable product or process requirements? → Quality Function Deployment (QFD) / House of Quality
23. In Lean, 'continuous flow' means: → Processing one unit at a time and passing it immediately to the next step
24. In a Lean Six Sigma assessment, what does Overall Equipment Effectiveness (OEE) measure? → The combined impact of availability, performance, and quality on productive output
25. A fishbone (Ishikawa) diagram categorizes potential causes typically under which common categories? → People, Machine, Method, Material, Measurement, Environment
26. The Y in the equation Y = F(X) is → Output
27. Which of the following best describes 'poka-yoke'? → An error-proofing mechanism that prevents or detects defects
28. Which of the seven wastes refers to producing more than the customer currently demands? → Overproduction
29. In a Gauge R&R study, 'reproducibility' refers to variation caused by: → Different operators measuring the same part
30. A Yellow Belt is asked to describe the 'as-is' process during Define. This means they should document: → How the process actually works today, not how it is supposed to work