Lean Six Sigma Green Belt Certification Exam | Complete
Practice Questions, Verified Answers & Detailed Rationales
(2026/2027)
QUESTION 1
What is the primary purpose of a Project Charter in the Define phase of
DMAIC?
A. To document the final financial savings after project completion.
B. To define the project's scope, objectives, business case, and team
roles, serving as a contract between leadership and the team.
C. To test hypotheses using statistical software like Minitab.
D. To design the physical layout of a manufacturing plant using 5S.
Correct Answer: B. To define the project's scope, objectives, business
case, and team roles, serving as a contract between leadership and the
team.
Detailed Rationale: A project charter keeps the team focused, prevents
scope creep, and ensures alignment between project sponsors and
team members from the very beginning.
QUESTION 2
What does SIPOC stand for in process mapping?
A. Suppliers, Inputs, Process, Outputs, Customers
B. Safety, Inspection, Production, Operations, Control
C. Standard, Implementation, Procedure, Output, Cost
,D. System, Interface, Processing, Objective, Check
Correct Answer: A. Suppliers, Inputs, Process, Outputs, Customers
Detailed Rationale: SIPOC is a high-level tool used in the Define phase
to scope a process and identify all key elements affecting it.
QUESTION 3
Which of the following represents the "M" in the 8 Wastes acronym
TIMWOODS?
A. Manufacturing
B. Motion
C. Management
D. Measurement
Correct Answer: B. Motion
Detailed Rationale: TIMWOODS stands for Transportation, Inventory,
Motion, Waiting, Overproduction, Overprocessing, Defects, and Skills.
"Motion" refers to unnecessary physical movement of people.
QUESTION 4
Data that can be counted and falls into distinct categories (e.g.,
pass/fail, number of defects) is classified as what type of data?
A. Continuous data
B. Discrete (attribute) data
C. Interval data
D. Ratio data
,Correct Answer: B. Discrete (attribute) data
Detailed Rationale: Discrete data represents countable items or
classifications, whereas continuous data can take on any fractional
value within a range (e.g., weight, time, temperature).
QUESTION 5
What does a Process Capability index ( ) value of less than 1.0 indicate
about a process?
A. The process is extremely capable and producing zero defects.
B. The process is centered perfectly between the specifications.
C. The process is not capable of meeting customer specifications and is
producing defects.
D. Measurement system error is zero.
Correct Answer: C. The process is not capable of meeting customer
specifications and is producing defects.
Detailed Rationale: A of less than 1.0 means the process spread
exceeds the customer specification limits, resulting in products falling
outside allowable tolerances.
QUESTION 6
What is the primary purpose of a Gage R&R (Repeatability and
Reproducibility) study?
A. To measure how fast operators can assemble a product.
B. To evaluate the variation introduced by the measurement system
itself versus the actual process variation.
, C. To test customer satisfaction levels.
D. To determine equipment downtime costs.
Correct Answer: B. To evaluate the variation introduced by the
measurement system itself versus the actual process variation.
Detailed Rationale: A Gage R&R ensures that the measurement system
is trustworthy before data collection begins, separating equipment
error from operator error.
QUESTION 7
Which tool is primarily used during the Analyze phase to brainstorm
and visually organize potential root causes of a specific problem,
categorized typically by Man, Machine, Material, Method,
Measurement, and Milieu (Environment)?
A. Pareto Chart
B. Fishbone (Ishikawa) Diagram
C. Control Chart
D. Scatter Plot
Correct Answer: B. Fishbone (Ishikawa) Diagram
Detailed Rationale: The Fishbone diagram helps structure team
brainstorming sessions to explore all potential categories of causes
leading to an effect or problem.
QUESTION 8
What is the core methodology behind the "5 Whys" technique?
A. Asking a customer why they bought a product five times.
Practice Questions, Verified Answers & Detailed Rationales
(2026/2027)
QUESTION 1
What is the primary purpose of a Project Charter in the Define phase of
DMAIC?
A. To document the final financial savings after project completion.
B. To define the project's scope, objectives, business case, and team
roles, serving as a contract between leadership and the team.
C. To test hypotheses using statistical software like Minitab.
D. To design the physical layout of a manufacturing plant using 5S.
Correct Answer: B. To define the project's scope, objectives, business
case, and team roles, serving as a contract between leadership and the
team.
Detailed Rationale: A project charter keeps the team focused, prevents
scope creep, and ensures alignment between project sponsors and
team members from the very beginning.
QUESTION 2
What does SIPOC stand for in process mapping?
A. Suppliers, Inputs, Process, Outputs, Customers
B. Safety, Inspection, Production, Operations, Control
C. Standard, Implementation, Procedure, Output, Cost
,D. System, Interface, Processing, Objective, Check
Correct Answer: A. Suppliers, Inputs, Process, Outputs, Customers
Detailed Rationale: SIPOC is a high-level tool used in the Define phase
to scope a process and identify all key elements affecting it.
QUESTION 3
Which of the following represents the "M" in the 8 Wastes acronym
TIMWOODS?
A. Manufacturing
B. Motion
C. Management
D. Measurement
Correct Answer: B. Motion
Detailed Rationale: TIMWOODS stands for Transportation, Inventory,
Motion, Waiting, Overproduction, Overprocessing, Defects, and Skills.
"Motion" refers to unnecessary physical movement of people.
QUESTION 4
Data that can be counted and falls into distinct categories (e.g.,
pass/fail, number of defects) is classified as what type of data?
A. Continuous data
B. Discrete (attribute) data
C. Interval data
D. Ratio data
,Correct Answer: B. Discrete (attribute) data
Detailed Rationale: Discrete data represents countable items or
classifications, whereas continuous data can take on any fractional
value within a range (e.g., weight, time, temperature).
QUESTION 5
What does a Process Capability index ( ) value of less than 1.0 indicate
about a process?
A. The process is extremely capable and producing zero defects.
B. The process is centered perfectly between the specifications.
C. The process is not capable of meeting customer specifications and is
producing defects.
D. Measurement system error is zero.
Correct Answer: C. The process is not capable of meeting customer
specifications and is producing defects.
Detailed Rationale: A of less than 1.0 means the process spread
exceeds the customer specification limits, resulting in products falling
outside allowable tolerances.
QUESTION 6
What is the primary purpose of a Gage R&R (Repeatability and
Reproducibility) study?
A. To measure how fast operators can assemble a product.
B. To evaluate the variation introduced by the measurement system
itself versus the actual process variation.
, C. To test customer satisfaction levels.
D. To determine equipment downtime costs.
Correct Answer: B. To evaluate the variation introduced by the
measurement system itself versus the actual process variation.
Detailed Rationale: A Gage R&R ensures that the measurement system
is trustworthy before data collection begins, separating equipment
error from operator error.
QUESTION 7
Which tool is primarily used during the Analyze phase to brainstorm
and visually organize potential root causes of a specific problem,
categorized typically by Man, Machine, Material, Method,
Measurement, and Milieu (Environment)?
A. Pareto Chart
B. Fishbone (Ishikawa) Diagram
C. Control Chart
D. Scatter Plot
Correct Answer: B. Fishbone (Ishikawa) Diagram
Detailed Rationale: The Fishbone diagram helps structure team
brainstorming sessions to explore all potential categories of causes
leading to an effect or problem.
QUESTION 8
What is the core methodology behind the "5 Whys" technique?
A. Asking a customer why they bought a product five times.
