Lean Six Sigma Green Belt Certification
Exam Practice Questions And Correct
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1. Which phase of the DMAIC methodology focuses primarily on
identifying the root causes of process variation?
A. Define
B. Measure
C. Analyze
D. Control
Rationale: The Analyze phase uses statistical and analytical tools such as
cause-and-effect diagrams, hypothesis testing, regression analysis, and
process analysis to identify the root causes of defects and process variation
before improvements are implemented.
2. In Lean Six Sigma, a Critical to Quality (CTQ) characteristic is best
defined as:
A. A financial objective established by senior management.
B. A measurable product or service characteristic that is essential to
meeting customer requirements.
,C. A performance indicator selected by the production supervisor.
D. A regulatory requirement applicable to all manufacturing organizations.
Rationale: CTQs are measurable characteristics that directly affect
customer satisfaction and are derived from the Voice of the Customer
(VOC). They ensure improvement efforts focus on customer expectations.
3. Which metric is commonly used to express the number of defects
occurring per one million opportunities?
A. Yield
B. Cp
C. Sigma Level
D. Defects Per Million Opportunities (DPMO)
Rationale: DPMO standardizes defect measurement by considering both
the number of defects and the number of opportunities for defects,
allowing comparison across different processes.
4. A process with excessive waiting time, transportation, and
unnecessary movement is primarily exhibiting which Lean concept?
A. Variation
B. Overprocessing
C. Waste (Muda)
D. Voice of Customer
Rationale: Waiting, transportation, and unnecessary motion are among
the eight wastes (Muda) identified in Lean methodology and should be
eliminated to improve process efficiency.
5. During the Define phase, which document formally authorizes the
project and identifies its objectives, scope, business case, and team
members?
,A. SIPOC Diagram
B. Control Plan
C. Process Map
D. Project Charter
Rationale: The Project Charter establishes the project's purpose, goals,
scope, timeline, stakeholders, and expected benefits, providing direction
for the improvement team.
6. Which graphical tool is most appropriate for identifying the small
number of causes responsible for the majority of problems?
A. Scatter Diagram
B. Histogram
C. Run Chart
D. Pareto Chart
Rationale: The Pareto Chart applies the 80/20 principle, helping teams
prioritize improvement efforts by identifying the most significant
contributors to defects or problems.
7. The Voice of the Customer (VOC) is primarily collected to:
A. Determine employee performance ratings.
B. Estimate manufacturing costs.
C. Understand customer expectations and translate them into measurable
requirements.
D. Develop accounting procedures.
Rationale: VOC captures customer needs and expectations, which are
translated into measurable CTQ requirements that guide improvement
initiatives.
8. Which Lean tool visually displays every step in a process while
distinguishing value-added and non-value-added activities?
, A. Fishbone Diagram
B. Affinity Diagram
C. Value Stream Map
D. Check Sheet
Rationale: Value Stream Mapping provides a comprehensive view of
material and information flow, allowing teams to identify waste and
opportunities for process improvement.
9. Which measure represents the proportion of units that pass through a
process without requiring rework?
A. Defect Density
B. First Pass Yield (FPY)
C. DPMO
D. Process Capability Index
Rationale: First Pass Yield measures process effectiveness by determining
the percentage of products or services completed correctly the first time.
10. Which statement best describes process capability?
A. The average time required to complete production.
B. The amount of inventory available.
C. The ability of a stable process to consistently meet specification limits.
D. The percentage of products inspected.
Rationale: Process capability evaluates whether a stable process can
consistently produce outputs within customer or engineering specifications,
commonly using indices such as Cp and Cpk.
11. Which tool is primarily used in Lean Six Sigma to identify
relationships between potential causes and an effect?
A. Control Chart
B. Fishbone (Ishikawa) Diagram
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. Which phase of the DMAIC methodology focuses primarily on
identifying the root causes of process variation?
A. Define
B. Measure
C. Analyze
D. Control
Rationale: The Analyze phase uses statistical and analytical tools such as
cause-and-effect diagrams, hypothesis testing, regression analysis, and
process analysis to identify the root causes of defects and process variation
before improvements are implemented.
2. In Lean Six Sigma, a Critical to Quality (CTQ) characteristic is best
defined as:
A. A financial objective established by senior management.
B. A measurable product or service characteristic that is essential to
meeting customer requirements.
,C. A performance indicator selected by the production supervisor.
D. A regulatory requirement applicable to all manufacturing organizations.
Rationale: CTQs are measurable characteristics that directly affect
customer satisfaction and are derived from the Voice of the Customer
(VOC). They ensure improvement efforts focus on customer expectations.
3. Which metric is commonly used to express the number of defects
occurring per one million opportunities?
A. Yield
B. Cp
C. Sigma Level
D. Defects Per Million Opportunities (DPMO)
Rationale: DPMO standardizes defect measurement by considering both
the number of defects and the number of opportunities for defects,
allowing comparison across different processes.
4. A process with excessive waiting time, transportation, and
unnecessary movement is primarily exhibiting which Lean concept?
A. Variation
B. Overprocessing
C. Waste (Muda)
D. Voice of Customer
Rationale: Waiting, transportation, and unnecessary motion are among
the eight wastes (Muda) identified in Lean methodology and should be
eliminated to improve process efficiency.
5. During the Define phase, which document formally authorizes the
project and identifies its objectives, scope, business case, and team
members?
,A. SIPOC Diagram
B. Control Plan
C. Process Map
D. Project Charter
Rationale: The Project Charter establishes the project's purpose, goals,
scope, timeline, stakeholders, and expected benefits, providing direction
for the improvement team.
6. Which graphical tool is most appropriate for identifying the small
number of causes responsible for the majority of problems?
A. Scatter Diagram
B. Histogram
C. Run Chart
D. Pareto Chart
Rationale: The Pareto Chart applies the 80/20 principle, helping teams
prioritize improvement efforts by identifying the most significant
contributors to defects or problems.
7. The Voice of the Customer (VOC) is primarily collected to:
A. Determine employee performance ratings.
B. Estimate manufacturing costs.
C. Understand customer expectations and translate them into measurable
requirements.
D. Develop accounting procedures.
Rationale: VOC captures customer needs and expectations, which are
translated into measurable CTQ requirements that guide improvement
initiatives.
8. Which Lean tool visually displays every step in a process while
distinguishing value-added and non-value-added activities?
, A. Fishbone Diagram
B. Affinity Diagram
C. Value Stream Map
D. Check Sheet
Rationale: Value Stream Mapping provides a comprehensive view of
material and information flow, allowing teams to identify waste and
opportunities for process improvement.
9. Which measure represents the proportion of units that pass through a
process without requiring rework?
A. Defect Density
B. First Pass Yield (FPY)
C. DPMO
D. Process Capability Index
Rationale: First Pass Yield measures process effectiveness by determining
the percentage of products or services completed correctly the first time.
10. Which statement best describes process capability?
A. The average time required to complete production.
B. The amount of inventory available.
C. The ability of a stable process to consistently meet specification limits.
D. The percentage of products inspected.
Rationale: Process capability evaluates whether a stable process can
consistently produce outputs within customer or engineering specifications,
commonly using indices such as Cp and Cpk.
11. Which tool is primarily used in Lean Six Sigma to identify
relationships between potential causes and an effect?
A. Control Chart
B. Fishbone (Ishikawa) Diagram
