Certified Six Sigma Green Belt (CSSGB) Exam 2026: Professional
Certification Practice Test — DMAIC, Quality Improvement,
Statistical Analysis, Process Control & Project Management — 190
Multiple-Choice Questions with Answers & Detailed Rationales
SECTION 1: FOUNDATIONAL QUALITY CONCEPTS AND SIX SIGMA OVERVIEW (Questions 1-
20)
Question 1
Which quality pioneer is credited with developing the concept of statistical process control
(SPC) and the control chart?
A. Joseph Juran
B. W. Edwards Deming
C. Walter Shewhart
D. Philip Crosby
Correct Answer: C
Explanation: Walter Shewhart developed SPC and control charts at Bell Labs in the 1920s;
Deming and Juran later popularized quality management.
Question 2
A manufacturing company produces widgets with a specification range of 10.0 ± 0.5 mm.
The process mean is 10.0 mm with a standard deviation of 0.1 mm. What is the process
capability index (Cp)?
A. 1.00
,B. 1.33
C. 1.67
D. 2.00
Correct Answer: C
Explanation: Cp = (USL - LSL) / (6σ) = (10.5 - 9.5) / (6 × 0.1) = 1..6 = 1.67.
Question 3
In Six Sigma terminology, what does the term "sigma level" represent?
A. The number of defects per million opportunities
B. The number of standard deviations between the process mean and the nearest
specification limit
C. The percentage of products that pass inspection
D. The ratio of good products to total production
Correct Answer: B
Explanation: Sigma level quantifies process capability by measuring how many standard
deviations fit between the mean and specification limits.
Question 4
A Green Belt is leading a project to reduce customer complaints in a call center. Which phase
of DMAIC would involve creating a project charter and identifying key stakeholders?
A. Define
,B. Measure
C. Analyze
D. Improve
Correct Answer: A
Explanation: The Define phase establishes the project scope, charter, stakeholder analysis,
and high-level goals before measurement begins.
Question 5
Which of the following best describes the concept of "Cost of Poor Quality" (COPQ)?
A. The cost of implementing a quality management system
B. The total cost associated with preventing, detecting, and correcting defects
C. The cost of raw materials used in production
D. The cost of employee training programs
Correct Answer: B
Explanation: COPQ includes prevention, appraisal, internal failure, and external failure costs
associated with producing nonconforming products or services.
Question 6
A process produces 500 units per day. Historical data shows that 15 units per day require
rework. What is the process yield?
A. 85%
, B. 90%
C. 95%
D. 97%
Correct Answer: D
Explanation: Yield = (500 - 15) / 500 = 485/500 = 97%. Rework reduces effective yield but the
calculation uses total units minus defects.
Question 7
Which Six Sigma role is responsible for providing strategic direction, allocating resources,
and removing barriers for project teams?
A. Green Belt
B. Black Belt
C. Champion
D. Master Black Belt
Correct Answer: C
Explanation: Champions are senior leaders who sponsor projects, secure resources, and
ensure alignment with organizational strategy.
Question 8
What is the primary purpose of a Pareto chart in Six Sigma?
A. To show the relationship between two variables
Certification Practice Test — DMAIC, Quality Improvement,
Statistical Analysis, Process Control & Project Management — 190
Multiple-Choice Questions with Answers & Detailed Rationales
SECTION 1: FOUNDATIONAL QUALITY CONCEPTS AND SIX SIGMA OVERVIEW (Questions 1-
20)
Question 1
Which quality pioneer is credited with developing the concept of statistical process control
(SPC) and the control chart?
A. Joseph Juran
B. W. Edwards Deming
C. Walter Shewhart
D. Philip Crosby
Correct Answer: C
Explanation: Walter Shewhart developed SPC and control charts at Bell Labs in the 1920s;
Deming and Juran later popularized quality management.
Question 2
A manufacturing company produces widgets with a specification range of 10.0 ± 0.5 mm.
The process mean is 10.0 mm with a standard deviation of 0.1 mm. What is the process
capability index (Cp)?
A. 1.00
,B. 1.33
C. 1.67
D. 2.00
Correct Answer: C
Explanation: Cp = (USL - LSL) / (6σ) = (10.5 - 9.5) / (6 × 0.1) = 1..6 = 1.67.
Question 3
In Six Sigma terminology, what does the term "sigma level" represent?
A. The number of defects per million opportunities
B. The number of standard deviations between the process mean and the nearest
specification limit
C. The percentage of products that pass inspection
D. The ratio of good products to total production
Correct Answer: B
Explanation: Sigma level quantifies process capability by measuring how many standard
deviations fit between the mean and specification limits.
Question 4
A Green Belt is leading a project to reduce customer complaints in a call center. Which phase
of DMAIC would involve creating a project charter and identifying key stakeholders?
A. Define
,B. Measure
C. Analyze
D. Improve
Correct Answer: A
Explanation: The Define phase establishes the project scope, charter, stakeholder analysis,
and high-level goals before measurement begins.
Question 5
Which of the following best describes the concept of "Cost of Poor Quality" (COPQ)?
A. The cost of implementing a quality management system
B. The total cost associated with preventing, detecting, and correcting defects
C. The cost of raw materials used in production
D. The cost of employee training programs
Correct Answer: B
Explanation: COPQ includes prevention, appraisal, internal failure, and external failure costs
associated with producing nonconforming products or services.
Question 6
A process produces 500 units per day. Historical data shows that 15 units per day require
rework. What is the process yield?
A. 85%
, B. 90%
C. 95%
D. 97%
Correct Answer: D
Explanation: Yield = (500 - 15) / 500 = 485/500 = 97%. Rework reduces effective yield but the
calculation uses total units minus defects.
Question 7
Which Six Sigma role is responsible for providing strategic direction, allocating resources,
and removing barriers for project teams?
A. Green Belt
B. Black Belt
C. Champion
D. Master Black Belt
Correct Answer: C
Explanation: Champions are senior leaders who sponsor projects, secure resources, and
ensure alignment with organizational strategy.
Question 8
What is the primary purpose of a Pareto chart in Six Sigma?
A. To show the relationship between two variables
