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What is the primary goal of Six Sigma?

Increase production speed by 50%

Reduce process variation and defects to achieve near-perfect quality

Eliminate all employees in the quality department

Create more paperwork and documentation

to track

2026 Statistics

Key Facts: CSSGB Exam

110

Exam Questions

100 scored + 10 unscored

550/750

Passing Score (Scaled)

ASQ

4h 18m

Exam Duration

ASQ

$483-623

Exam Fee

ASQ member/non-member

~77%

Pass Rate

ASQ historical data

Lifetime

Certification Validity

No recertification

The CSSGB exam has 110 multiple-choice questions (100 scored + 10 unscored) in 4 hours 18 minutes with a passing score of 550/750 (scaled). Six domains: Overview/Organization (11%), Define (20%), Measure (20%), Analyze (18%), Improve (16%), and Control (15%). Requires 3 years of full-time work experience in Six Sigma BOK areas. Open-book exam with lifetime certification.

Sample CSSGB Practice Questions

Try these sample questions to test your CSSGB exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1What is the primary goal of Six Sigma?

A.Increase production speed by 50%

B.Reduce process variation and defects to achieve near-perfect quality

C.Eliminate all employees in the quality department

D.Create more paperwork and documentation

Explanation: The primary goal of Six Sigma is to reduce process variation and defects to achieve near-perfect quality, specifically 3.4 defects per million opportunities (DPMO). This methodology focuses on data-driven decision making and continuous process improvement. Exam tip: Remember that Six Sigma = 3.4 DPMO = 99.99966% quality.

2What does DMAIC stand for in Six Sigma?

A.Design, Measure, Analyze, Improve, Control

B.Define, Measure, Analyze, Improve, Control

C.Develop, Monitor, Assess, Integrate, Complete

D.Document, Manage, Audit, Implement, Check

Explanation: DMAIC stands for Define, Measure, Analyze, Improve, and Control. It is the data-driven improvement cycle used for improving, optimizing, and stabilizing business processes. This structured approach guides Green Belts through systematic problem-solving. Exam tip: DMADV (Define, Measure, Analyze, Design, Verify) is used for new process design, while DMAIC improves existing processes.

3In a Six Sigma organization, what is the primary role of an Executive?

A.To perform statistical analysis on project data

B.To provide strategic direction, resources, and remove barriers

C.To lead daily project team meetings

D.To manually inspect all products before shipment

Explanation: Executives in Six Sigma provide strategic direction, allocate resources, remove organizational barriers, and demonstrate commitment to quality improvement. They sponsor projects at the business level and hold Champions accountable for results. Exam tip: Leadership commitment is essential for Six Sigma success - without executive support, projects often fail due to lack of resources.

4What is the key difference between Lean and Six Sigma?

A.Lean focuses on speed and waste reduction while Six Sigma focuses on variation reduction

B.Lean is only for manufacturing while Six Sigma is only for service industries

C.Lean requires Black Belts while Six Sigma requires only Green Belts

D.There is no difference; they are identical methodologies

Explanation: Lean focuses on eliminating waste (muda) and improving flow/speed, while Six Sigma focuses on reducing variation and defects. Lean Six Sigma combines both approaches for comprehensive process improvement. Exam tip: Think "Lean = Speed/Waste" and "Six Sigma = Quality/Variation" - together they optimize both dimensions.

5What is Design for Six Sigma (DFSS) used for?

A.Improving existing processes with known problems

B.Creating new processes or products that meet customer requirements from the start

C.Training employees on basic quality tools

D.Documenting historical process performance data

Explanation: Design for Six Sigma (DFSS) is used to design new processes, products, or services that meet customer requirements from the outset. Unlike DMAIC which improves existing processes, DFSS (using DMADV or IDOV) builds quality into new designs. Exam tip: Use DMAIC for existing processes with problems; use DFSS for new designs or when processes need complete redesign.

6A process currently operates at 4.5 sigma level. What is the approximate defect rate?

A.3.4 defects per million opportunities

B.1,350 defects per million opportunities

C.66,807 defects per million opportunities

D.233 defects per million opportunities

Explanation: At 4.5 sigma level (with 1.5 sigma shift), the defect rate is approximately 3.4 DPMO. However, at 4.5 sigma without shift consideration, the defect rate is approximately 1,350 DPMO. The 3.4 DPMO figure assumes the 1.5 sigma shift that accounts for long-term process drift. Exam tip: Remember - 6 sigma = 3.4 DPMO (with shift), 5 sigma ≈ 233 DPMO, 4 sigma ≈ 6,210 DPMO.

7What is a Project Charter in Six Sigma?

A.A document that formally authorizes the existence of a project

B.A tool for measuring process capability

C.A statistical software license agreement

D.An employee vacation schedule

Explanation: A Project Charter is a document that formally authorizes the existence of a project and provides the project manager with authority to apply organizational resources to project activities. It typically includes problem statement, scope, goals, team members, and timeline. Exam tip: The charter is created early in the Define phase and helps prevent scope creep.

8What does CTQ stand for in Six Sigma?

A.Critical to Quality

B.Cost Time Quantity

C.Central Testing Queue

D.Complete Total Quality

Explanation: CTQ stands for Critical to Quality. CTQs are the key measurable characteristics of a product or process whose performance standards must be met to satisfy the customer. They translate customer needs into specific, measurable requirements. Exam tip: CTQs flow down from VOC (Voice of Customer) and are essential for focusing improvement efforts on what matters most.

9What is the Voice of the Customer (VOC)?

A.A monthly management meeting

B.The process of capturing customer requirements, expectations, and feedback

C.A quality control inspection station

D.A type of statistical chart

Explanation: Voice of the Customer (VOC) is the process of capturing customer requirements, expectations, preferences, and feedback. It involves collecting data through surveys, interviews, focus groups, and other methods to understand what customers truly value. Exam tip: VOC drives CTQs which drive the measurement and improvement plan.

10In a SIPOC diagram, what does the "S" represent?

A.Strategy

B.Suppliers

C.Standards

D.Specifications

Explanation: In a SIPOC diagram, "S" stands for Suppliers - the entities that provide inputs to the process. SIPOC (Suppliers, Inputs, Process, Outputs, Customers) is a high-level process mapping tool used to define the scope of a process and identify key elements at a glance. Exam tip: SIPOC is typically created during Define to understand the process boundaries before detailed mapping.

About the CSSGB Exam

The CSSGB (Certified Six Sigma Green Belt) exam validates competency in the DMAIC methodology, statistical analysis, process improvement, and quality control. The ASQ exam covers Six Sigma fundamentals, Define, Measure, Analyze, Improve, and Control phases with 100 scored questions plus 10 unscored.

Questions

110 scored questions

Time Limit

4 hours 18 minutes

Passing Score

550/750 (scaled)

Exam Fee

$483 (members) / $623 (non-members) (ASQ (American Society for Quality))

CSSGB Exam Content Outline

11%

Overview: Six Sigma and the Organization

Six Sigma fundamentals, lean principles, design for Six Sigma (DFSS), organizational goals, team dynamics

20%

Define Phase

Project charter, voice of customer, CTQ, SIPOC, process mapping, stakeholder analysis

20%

Measure Phase

Process analysis, descriptive statistics, probability distributions, measurement systems analysis, process capability

18%

Analyze Phase

Exploratory data analysis, hypothesis testing, correlation and regression, root cause analysis

16%

Improve Phase

Design of experiments (DOE), FMEA, error proofing, continuous improvement

15%

Control Phase

Statistical process control, control plans, SPC charts, total productive maintenance

How to Pass the CSSGB Exam

What You Need to Know

Passing score: 550/750 (scaled)
Exam length: 110 questions
Time limit: 4 hours 18 minutes
Exam fee: $483 (members) / $623 (non-members)

Keys to Passing

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

CSSGB Study Tips from Top Performers

1Focus on Define (20%) and Measure (20%) — the two largest domains covering 40% of the exam

2Master descriptive statistics, probability distributions, and process capability indices (Cp, Cpk)

3Know measurement systems analysis (MSA) — gage R&R, bias, linearity, and stability

4Study control chart selection: X-bar/R, X-bar/S, p, np, c, u and when to use each type

5Practice hypothesis testing fundamentals: null/alternative hypotheses, alpha, beta, p-values

6Understand FMEA (Failure Mode and Effects Analysis) — severity, occurrence, detection, RPN calculation

Frequently Asked Questions

What is the CSSGB certification?

CSSGB (Certified Six Sigma Green Belt) is an ASQ certification that validates competency in the DMAIC methodology, statistical process improvement, and quality control. Green Belts typically work on improvement projects under Black Belt supervision.

How many questions are on the CSSGB exam?

The CSSGB exam has 110 multiple-choice questions (100 scored + 10 unscored) in 4 hours 18 minutes. The passing score is 550/750 on a scaled basis. The exam is open-book, allowing reference materials.

What are the prerequisites for the CSSGB exam?

ASQ requires 3 years of full-time, paid work experience in one or more areas of the Six Sigma Green Belt Body of Knowledge. No formal education requirement. Internships do not count toward experience.

Is the CSSGB exam open-book?

Yes, the ASQ CSSGB exam is open-book. You may bring reference materials and a calculator. Focus on knowing where to find key formulas and concepts quickly since the exam is time-limited.

How should I prepare for the CSSGB exam?

Plan for 80-120 hours of study over 6-12 weeks. Focus on Define (20%) and Measure (20%) — they are the two largest domains. Master process mapping, statistics, process capability, and measurement systems analysis.