LEAN SIX SIGMA YELLOW BELT
CERTIFICATION EXAMINATION QUESTION
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What is the primary goal of Lean Six Sigma?
A. Increase inspection activities
B. Reduce employee workload
C. Improve quality and efficiency by reducing waste and variation
D. Eliminate all defects
Rationale: Lean focuses on waste reduction while Six Sigma focuses on
reducing variation to improve performance.
2. Which methodology is most commonly used in Six Sigma projects?
A. PDCA
B. SIPOC
C. DMAIC
D. Kaizen
Rationale: DMAIC (Define, Measure, Analyze, Improve, Control) is the core
Six Sigma improvement framework.
3. What does “Lean” primarily focus on?
A. Statistical analysis
B. Employee training
C. Eliminating non-value-added activities
D. Product design
Rationale: Lean aims to maximize customer value by eliminating waste.
,4. Which of the following is NOT one of the 8 wastes of Lean?
A. Overproduction
B. Waiting
C. Motion
D. Motivation
Rationale: Motivation is not a Lean waste; the wastes include defects,
overproduction, waiting, non-utilized talent, transportation, inventory,
motion, and extra-processing.
5. What does DMAIC stand for?
A. Define, Manage, Analyze, Improve, Control
B. Develop, Measure, Analyze, Improve, Check
C. Define, Measure, Analyze, Improve, Control
D. Design, Measure, Analyze, Improve, Control
Rationale: DMAIC is the standard Six Sigma problem-solving cycle.
6. Who is the customer in Lean Six Sigma?
A. Management
B. Suppliers
C. Anyone who receives the output of a process
D. Regulators
Rationale: Customers can be internal or external recipients of process
outputs.
7. What is a SIPOC diagram used for?
A. Data collection
B. Root cause analysis
C. High-level process mapping
D. Statistical testing
Rationale: SIPOC defines Suppliers, Inputs, Process, Outputs, and
Customers.
8. Which phase of DMAIC identifies the problem and project scope?
A. Measure
B. Analyze
, C. Improve
D. Define
Rationale: The Define phase clarifies objectives, scope, and customer
requirements.
9. What does CTQ stand for?
A. Cost to Quality
B. Control Through Quality
C. Critical to Quality
D. Continuous Total Quality
Rationale: CTQs are key characteristics important to customers.
10.Which tool identifies root causes visually?
A. Histogram
B. Control chart
C. Fishbone diagram
D. Scatter plot
Rationale: Fishbone (Ishikawa) diagrams help categorize potential root
causes.
11.What is variation in a process?
A. Planned changes
B. Differences in process output
C. Customer complaints
D. Machine downtime
Rationale: Variation refers to inconsistency in process results.
12.Six Sigma quality corresponds to approximately how many defects per
million opportunities?
A. 1
B. 100
C. 3.4
CERTIFICATION EXAMINATION QUESTION
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What is the primary goal of Lean Six Sigma?
A. Increase inspection activities
B. Reduce employee workload
C. Improve quality and efficiency by reducing waste and variation
D. Eliminate all defects
Rationale: Lean focuses on waste reduction while Six Sigma focuses on
reducing variation to improve performance.
2. Which methodology is most commonly used in Six Sigma projects?
A. PDCA
B. SIPOC
C. DMAIC
D. Kaizen
Rationale: DMAIC (Define, Measure, Analyze, Improve, Control) is the core
Six Sigma improvement framework.
3. What does “Lean” primarily focus on?
A. Statistical analysis
B. Employee training
C. Eliminating non-value-added activities
D. Product design
Rationale: Lean aims to maximize customer value by eliminating waste.
,4. Which of the following is NOT one of the 8 wastes of Lean?
A. Overproduction
B. Waiting
C. Motion
D. Motivation
Rationale: Motivation is not a Lean waste; the wastes include defects,
overproduction, waiting, non-utilized talent, transportation, inventory,
motion, and extra-processing.
5. What does DMAIC stand for?
A. Define, Manage, Analyze, Improve, Control
B. Develop, Measure, Analyze, Improve, Check
C. Define, Measure, Analyze, Improve, Control
D. Design, Measure, Analyze, Improve, Control
Rationale: DMAIC is the standard Six Sigma problem-solving cycle.
6. Who is the customer in Lean Six Sigma?
A. Management
B. Suppliers
C. Anyone who receives the output of a process
D. Regulators
Rationale: Customers can be internal or external recipients of process
outputs.
7. What is a SIPOC diagram used for?
A. Data collection
B. Root cause analysis
C. High-level process mapping
D. Statistical testing
Rationale: SIPOC defines Suppliers, Inputs, Process, Outputs, and
Customers.
8. Which phase of DMAIC identifies the problem and project scope?
A. Measure
B. Analyze
, C. Improve
D. Define
Rationale: The Define phase clarifies objectives, scope, and customer
requirements.
9. What does CTQ stand for?
A. Cost to Quality
B. Control Through Quality
C. Critical to Quality
D. Continuous Total Quality
Rationale: CTQs are key characteristics important to customers.
10.Which tool identifies root causes visually?
A. Histogram
B. Control chart
C. Fishbone diagram
D. Scatter plot
Rationale: Fishbone (Ishikawa) diagrams help categorize potential root
causes.
11.What is variation in a process?
A. Planned changes
B. Differences in process output
C. Customer complaints
D. Machine downtime
Rationale: Variation refers to inconsistency in process results.
12.Six Sigma quality corresponds to approximately how many defects per
million opportunities?
A. 1
B. 100
C. 3.4
