Lean Six Sigma Green Belt Practice Exam Questions And
Correct Answers (Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which Lean Six Sigma method focuses on improving existing processes?
A. DMADV
B. DFSS
C. DMAIC
D. SIPOC
DMAIC is used for improving existing processes, while DMADV/DFSS design
new processes.
2. In DMAIC, which phase identifies the root causes of defects?
A. Measure
B. Analyze
C. Define
D. Control
Analyze isolates the true root causes using tools like regression and fishbone
diagrams.
3. The primary goal of Lean is to:
A. Increase inventory
B. Improve customer relationships
C. Remove waste
D. Reduce defects
Lean focuses mainly on eliminating waste (muda).
4. Six Sigma aims for a defect rate of:
A. 10,000 DPMO
B. 1,000 DPMO
C. 3.4 DPMO
D. 6 DPMO
Six Sigma performance is defined as 3.4 defects per million opportunities.
,5. CTQ stands for:
A. Critical to Quality
B. Cost to Quality
C. Critical to Quality
D. Customer Total Quality
CTQs reflect customer expectations and requirements.
6. A SIPOC diagram is used in which phase?
A. Define
B. Measure
C. Analyze
D. Improve
SIPOC provides a high-level map of the process at the start of the project.
7. Value stream mapping is mainly used to identify:
A. Variability
B. Defects
C. Waste
D. Costs
Value stream maps visualize value-added and non-value-added steps.
8. Which is NOT one of the 7 wastes?
A. Overproduction
B. Motion
C. Waiting
D. Innovation
Innovation is not a Lean waste.
9. The voice of the customer (VOC) is gathered in which DMAIC phase?
, A. Measure
B. Analyze
C. Define
D. Improve
VOC is used to define customer needs early in the project.
10. Standard deviation is a measure of:
A. Central tendency
B. Variation
C. Normality
D. Process capability
σ measures spread or dispersion in data.
11. A control chart is used to:
A. Measure cost
B. Monitor process stability
C. Show customer satisfaction
D. Allocate resources
Control charts detect abnormal variations.
12. A project charter does NOT include:
A. Problem statement
B. Goals
C. Scope
D. Root cause analysis
Root causes are identified later in Analyze.
13. The 5 Whys technique helps determine:
A. DPMO
B. CTQs
C. Cost savings
Correct Answers (Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which Lean Six Sigma method focuses on improving existing processes?
A. DMADV
B. DFSS
C. DMAIC
D. SIPOC
DMAIC is used for improving existing processes, while DMADV/DFSS design
new processes.
2. In DMAIC, which phase identifies the root causes of defects?
A. Measure
B. Analyze
C. Define
D. Control
Analyze isolates the true root causes using tools like regression and fishbone
diagrams.
3. The primary goal of Lean is to:
A. Increase inventory
B. Improve customer relationships
C. Remove waste
D. Reduce defects
Lean focuses mainly on eliminating waste (muda).
4. Six Sigma aims for a defect rate of:
A. 10,000 DPMO
B. 1,000 DPMO
C. 3.4 DPMO
D. 6 DPMO
Six Sigma performance is defined as 3.4 defects per million opportunities.
,5. CTQ stands for:
A. Critical to Quality
B. Cost to Quality
C. Critical to Quality
D. Customer Total Quality
CTQs reflect customer expectations and requirements.
6. A SIPOC diagram is used in which phase?
A. Define
B. Measure
C. Analyze
D. Improve
SIPOC provides a high-level map of the process at the start of the project.
7. Value stream mapping is mainly used to identify:
A. Variability
B. Defects
C. Waste
D. Costs
Value stream maps visualize value-added and non-value-added steps.
8. Which is NOT one of the 7 wastes?
A. Overproduction
B. Motion
C. Waiting
D. Innovation
Innovation is not a Lean waste.
9. The voice of the customer (VOC) is gathered in which DMAIC phase?
, A. Measure
B. Analyze
C. Define
D. Improve
VOC is used to define customer needs early in the project.
10. Standard deviation is a measure of:
A. Central tendency
B. Variation
C. Normality
D. Process capability
σ measures spread or dispersion in data.
11. A control chart is used to:
A. Measure cost
B. Monitor process stability
C. Show customer satisfaction
D. Allocate resources
Control charts detect abnormal variations.
12. A project charter does NOT include:
A. Problem statement
B. Goals
C. Scope
D. Root cause analysis
Root causes are identified later in Analyze.
13. The 5 Whys technique helps determine:
A. DPMO
B. CTQs
C. Cost savings
