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Lean Six Sigma Green Belt Certification
Examination Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Green Belt Exam
Prep & Study Guide
1. What is the primary objective of Lean Six Sigma?
A. Increase inspection activities
B. Reduce variation and eliminate waste
C. Increase employee overtime
D. Maximize inventory levels
Answer: Reduce variation and eliminate waste
Rationale: Lean focuses on eliminating waste, while Six Sigma focuses on
reducing variation and defects. Together, they improve process performance,
quality, and customer value.
2. Which methodology is most commonly associated with improving an
existing process?
A. DMADV
B. DMAIC
C. DFSS
D. SIPOC
,Answer: DMAIC
Rationale: DMAIC stands for Define, Measure, Analyze, Improve, and Control
and is primarily used to improve existing processes.
3. What does the "D" in DMAIC represent?
A. Develop
B. Determine
C. Define
D. Document
Answer: Define
Rationale: The Define phase establishes the problem, project goals, customer
requirements, scope, and business case.
4. What is the purpose of a project charter?
A. Replace the control plan
B. Define the project's purpose, scope, objectives, and responsibilities
C. Calculate process capability
D. Identify all process defects
Answer: Define the project's purpose, scope, objectives, and responsibilities
Rationale: A project charter formally establishes the project direction and aligns
stakeholders before detailed improvement work begins.
5. What does VOC stand for?
A. Value of Control
B. Voice of the Customer
C. Variation of Capability
D. Verification of Compliance
Answer: Voice of the Customer
,Rationale: VOC represents customer needs, expectations, preferences, and
requirements that should guide process improvement.
6. Which tool is commonly used to translate customer requirements into
measurable requirements?
A. CTQ tree
B. Histogram
C. Scatter plot
D. Control chart
Answer: CTQ tree
Rationale: A Critical-to-Quality tree converts broad customer needs into specific,
measurable performance requirements.
7. What does SIPOC stand for?
A. Suppliers, Inputs, Process, Outputs, Customers
B. Systems, Inputs, Procedures, Operations, Controls
C. Suppliers, Inspection, Process, Outputs, Controls
D. Systems, Information, Process, Operations, Customers
Answer: Suppliers, Inputs, Process, Outputs, Customers
Rationale: SIPOC provides a high-level view of a process and identifies its major
suppliers, inputs, process steps, outputs, and customers.
8. Which DMAIC phase establishes baseline process performance?
A. Define
B. Measure
C. Improve
D. Control
Answer: Measure
, Rationale: The Measure phase determines how the process currently performs
using reliable operational definitions and baseline data.
9. What is an operational definition?
A. A general description of a problem
B. A precise description of how a measurement or condition will be determined
C. A financial statement
D. A project schedule
Answer: A precise description of how a measurement or condition will be
determined
Rationale: Operational definitions ensure that different people measure or
classify the same characteristic consistently.
10.What is a process baseline?
A. The desired future state
B. The current measured level of process performance
C. The project budget
D. The customer complaint list
Answer: The current measured level of process performance
Rationale: A baseline provides a factual starting point against which
improvement can later be compared.
11.Which measure represents the average of a dataset?
A. Range
B. Median
C. Mean
D. Mode
Answer: Mean
Lean Six Sigma Green Belt Certification
Examination Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Green Belt Exam
Prep & Study Guide
1. What is the primary objective of Lean Six Sigma?
A. Increase inspection activities
B. Reduce variation and eliminate waste
C. Increase employee overtime
D. Maximize inventory levels
Answer: Reduce variation and eliminate waste
Rationale: Lean focuses on eliminating waste, while Six Sigma focuses on
reducing variation and defects. Together, they improve process performance,
quality, and customer value.
2. Which methodology is most commonly associated with improving an
existing process?
A. DMADV
B. DMAIC
C. DFSS
D. SIPOC
,Answer: DMAIC
Rationale: DMAIC stands for Define, Measure, Analyze, Improve, and Control
and is primarily used to improve existing processes.
3. What does the "D" in DMAIC represent?
A. Develop
B. Determine
C. Define
D. Document
Answer: Define
Rationale: The Define phase establishes the problem, project goals, customer
requirements, scope, and business case.
4. What is the purpose of a project charter?
A. Replace the control plan
B. Define the project's purpose, scope, objectives, and responsibilities
C. Calculate process capability
D. Identify all process defects
Answer: Define the project's purpose, scope, objectives, and responsibilities
Rationale: A project charter formally establishes the project direction and aligns
stakeholders before detailed improvement work begins.
5. What does VOC stand for?
A. Value of Control
B. Voice of the Customer
C. Variation of Capability
D. Verification of Compliance
Answer: Voice of the Customer
,Rationale: VOC represents customer needs, expectations, preferences, and
requirements that should guide process improvement.
6. Which tool is commonly used to translate customer requirements into
measurable requirements?
A. CTQ tree
B. Histogram
C. Scatter plot
D. Control chart
Answer: CTQ tree
Rationale: A Critical-to-Quality tree converts broad customer needs into specific,
measurable performance requirements.
7. What does SIPOC stand for?
A. Suppliers, Inputs, Process, Outputs, Customers
B. Systems, Inputs, Procedures, Operations, Controls
C. Suppliers, Inspection, Process, Outputs, Controls
D. Systems, Information, Process, Operations, Customers
Answer: Suppliers, Inputs, Process, Outputs, Customers
Rationale: SIPOC provides a high-level view of a process and identifies its major
suppliers, inputs, process steps, outputs, and customers.
8. Which DMAIC phase establishes baseline process performance?
A. Define
B. Measure
C. Improve
D. Control
Answer: Measure
, Rationale: The Measure phase determines how the process currently performs
using reliable operational definitions and baseline data.
9. What is an operational definition?
A. A general description of a problem
B. A precise description of how a measurement or condition will be determined
C. A financial statement
D. A project schedule
Answer: A precise description of how a measurement or condition will be
determined
Rationale: Operational definitions ensure that different people measure or
classify the same characteristic consistently.
10.What is a process baseline?
A. The desired future state
B. The current measured level of process performance
C. The project budget
D. The customer complaint list
Answer: The current measured level of process performance
Rationale: A baseline provides a factual starting point against which
improvement can later be compared.
11.Which measure represents the average of a dataset?
A. Range
B. Median
C. Mean
D. Mode
Answer: Mean
