Career upgrade: Learn practical AI skills for better jobs and higher pay.
Level up
PracticeVideosBlogFlashcardsEspañol
All Practice Exams

100+ Free ICGB Practice Questions

Pass your IASSC Certified Lean Six Sigma Green Belt exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
100+ Questions
100% Free
1 / 100
Question 1
Score: 0/0

Which Lean control uses a signal to authorize replenishment or movement of work?

A
B
C
D
to track
Same family resources

Explore More IASSC Lean Six Sigma Certifications

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

IASSC Certified Lean Six Sigma Black Belt (ICBB)

Practice Questions

IASSC Certified Lean Six Sigma Yellow Belt (ICYB)

Practice Questions
2026 Statistics

Key Facts: ICGB Exam

100

Exam Questions

IASSC

3 hours

Time Limit

IASSC

70%

Passing Score

IASSC

$402

Current On-Demand Voucher

IASSC order page

No prerequisites

Eligibility

IASSC

Closed book

Exam Format

IASSC

The ICGB exam is a 100-question, closed-book, proctored exam with a 3-hour time limit and 70% minimum passing score. IASSC tests about 20 questions from each DMAIC BoK section: Define, Measure, Analyze, Improve, and Control. No prerequisites are required.

Sample ICGB Practice Questions

Try these sample questions to test your ICGB exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which sequence correctly represents the DMAIC improvement roadmap?
A.Define, Measure, Analyze, Improve, Control
B.Design, Manage, Audit, Inspect, Certify
C.Discover, Map, Assess, Implement, Close
D.Define, Monitor, Approve, Improve, Calculate
Explanation: DMAIC stands for Define, Measure, Analyze, Improve, and Control. It is the core problem-solving sequence used for improving an existing process in Lean Six Sigma projects.
2In Lean Six Sigma, a CTQ is best described as:
A.A financial summary prepared after project closure
B.A customer requirement translated into a measurable characteristic
C.A list of all stakeholders affected by a project
D.A control chart rule used for special-cause detection
Explanation: A critical-to-quality characteristic translates customer needs into measurable process or product requirements. CTQs help the team define what must be improved and how success will be measured.
3What is the primary purpose of a Lean Six Sigma project charter?
A.To record every data point collected during the project
B.To authorize the project and align scope, problem, goals, team, and benefits
C.To replace the need for a control plan
D.To prove that the selected solution is statistically significant
Explanation: A project charter establishes the business case, problem statement, goal statement, scope, roles, timeline, and expected benefits. It gives the team a shared contract before detailed measurement and analysis begin.
4The expression Y = f(x) in Six Sigma means that:
A.Process outputs are a function of process inputs and factors
B.All process outputs are independent of input variables
C.Financial savings must be calculated before any measurement work
D.Only customer survey data can be used to define a project
Explanation: Y represents the output or response, while x variables are potential inputs or causes. The improvement team studies which x variables drive the critical Y so it can reduce defects or variation.
5What does Pareto analysis help a Green Belt do?
A.Identify the vital few causes that account for much of the problem
B.Confirm that all causes have equal impact
C.Calculate the standard deviation of continuous data
D.Select the correct type of control chart
Explanation: Pareto analysis ranks categories from largest to smallest contribution and often applies the 80/20 idea. It helps the team focus effort on the causes or defect types with the greatest practical impact.
6Which activity best fits the Sort step in 5S?
A.Removing unneeded items from the work area
B.Creating a daily audit checklist
C.Labeling exact storage locations for needed tools
D.Cleaning equipment and work surfaces
Explanation: Sort separates needed items from unneeded items and removes what does not belong in the work area. The other 5S steps organize, clean, standardize, and sustain the improved workplace.
7A Green Belt is defining a project to reduce invoice rework. Which problem statement is strongest?
A.The billing team is careless and needs retraining.
B.Invoice rework is bad and should be reduced as soon as possible.
C.From January through March, 14% of invoices required rework, adding an average of 2.1 days to cycle time.
D.The new billing software should be replaced because users dislike it.
Explanation: A strong problem statement describes the measurable gap, time frame, and business impact without blaming people or presupposing a solution. This version gives baseline performance and connects the problem to cycle time.
8A process produced 12 defects in 300 units, and each unit has 4 defect opportunities. What is the DPMO?
A.1,000
B.4,000
C.10,000
D.40,000
Explanation: DPMO equals defects divided by total opportunities, multiplied by 1,000,000. Here, total opportunities are 300 x 4 = 1,200, so 12 / 1,200 x 1,000,000 = 10,000 DPMO.
9A process has three sequential steps with first-time yields of 0.95, 0.90, and 0.80. What is the rolled throughput yield?
A.0.684
B.0.800
C.0.883
D.2.650
Explanation: Rolled throughput yield is the product of the first-time yields across process steps. Multiplying 0.95 x 0.90 x 0.80 gives 0.684, or 68.4%.
10Which statement best distinguishes Lean and Six Sigma in an integrated Lean Six Sigma project?
A.Lean focuses on reducing waste and improving flow; Six Sigma focuses on reducing variation and defects.
B.Lean uses only statistical tests; Six Sigma uses only workplace organization.
C.Lean applies only to manufacturing; Six Sigma applies only to services.
D.Lean eliminates measurement; Six Sigma eliminates customer requirements.
Explanation: Lean and Six Sigma are complementary. Lean improves flow by removing non-value-added work, while Six Sigma reduces variation and defects through data-driven analysis.

About the ICGB Exam

The IASSC Certified Lean Six Sigma Green Belt validates practical knowledge of Lean Six Sigma methodology across DMAIC. Green Belts lead focused improvement projects or support Black Belt-led projects and are expected to apply, perform, interpret, and use tools from the IASSC Green Belt Body of Knowledge.

Assessment

Closed-book, proctored certification exam. IASSC states the exam has 100 questions, with some forms including up to 10 additional non-graded questions, and about 20 questions from each major DMAIC BoK section.

Time Limit

3 hours

Passing Score

70% minimum score

Exam Fee

$402 current IASSC On-Demand Web-Based voucher; IASSC certification-page text also references a $350 Green Belt voucher. (International Association for Six Sigma Certification (IASSC))

ICGB Exam Content Outline

Approximately 20 questions

Define Phase

Meanings and history of Six Sigma, project deliverables, Y = f(x), VOC/VOB/VOE, roles, process definition, CTQs, COPQ, Pareto analysis, basic Six Sigma metrics, project charter, project metrics, benefits capture, Lean, seven wastes, and 5S.

Approximately 20 questions

Measure Phase

Cause-and-effect diagrams, process maps, SIPOC, value stream maps, X-Y matrix, FMEA, basic and descriptive statistics, normality, graphical analysis, MSA, Gage R&R, variable and attribute MSA, stability, capability analysis, attribute capability, and monitoring techniques.

Approximately 20 questions

Analyze Phase

Multi-vari analysis, distribution classes, inference, sampling techniques, central limit theorem, hypothesis-testing concepts, alpha and beta risk, practical versus statistical significance, t-tests, variance tests, ANOVA, nonparametric tests, proportion tests, and chi-square contingency tables.

Approximately 20 questions

Improve Phase

Simple linear regression, correlation, regression equations, residual analysis, multiple regression, nonlinear regression, multiple linear regression, confidence intervals, prediction intervals, data transformation, and Box-Cox.

Approximately 20 questions

Control Phase

5S control methods, kanban, poka-yoke, SPC data collection, I-MR, Xbar-R, u, p, np, Xbar-S, CUSUM and EWMA charts, control chart anatomy, cost-benefit analysis, control plan elements, and response plan elements.

How to Pass the ICGB Exam

What You Need to Know

  • Passing score: 70% minimum score
  • Assessment: Closed-book, proctored certification exam. IASSC states the exam has 100 questions, with some forms including up to 10 additional non-graded questions, and about 20 questions from each major DMAIC BoK section.
  • Time limit: 3 hours
  • Exam fee: $402 current IASSC On-Demand Web-Based voucher; IASSC certification-page text also references a $350 Green Belt voucher.

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

ICGB Study Tips from Top Performers

1Study the official IASSC Green Belt BoK by DMAIC phase and keep a checklist of every listed topic.
2Practice identifying the correct tool for the data type: continuous versus attribute, normal versus non-normal, independent versus paired, and one group versus multiple groups.
3Know the purpose and interpretation of core metrics such as DPU, DPMO, RTY, Cp, and Cpk rather than memorizing formulas alone.
4Be able to explain how VOC becomes CTQ, how root causes are validated, and how control plans sustain verified improvements.
5Use timed practice because the official exam allows 3 hours for 100 questions.

Frequently Asked Questions

How many questions are on the IASSC Green Belt exam?

IASSC states that the Certified Lean Six Sigma Green Belt exam is a 100-question exam. Some forms may also include up to 10 additional non-graded questions.

How long is the ICGB exam?

The official IASSC Green Belt certification page lists a 3-hour allotted time for the proctored exam.

What score do I need to pass the IASSC Green Belt exam?

IASSC requires a minimum score of 70% to achieve the Certified Green Belt designation.

Are there prerequisites for IASSC Green Belt certification?

No. IASSC states that there are no prerequisites required to sit for the Certified Lean Six Sigma Green Belt exam, though training and project application experience are recommended.

What does the IASSC Green Belt BoK cover?

The official Green Belt Body of Knowledge is organized by Define, Measure, Analyze, Improve, and Control. It includes Lean tools, project charters, VOC/CTQ, FMEA, MSA, capability, hypothesis testing, regression, SPC, control charts, and control plans.