- How the CSSYB Blueprint Is Built
- Domain 1: Six Sigma Fundamentals
- Domain 2: Define Phase
- Domain 3: Measure Phase
- Domain 4: Analyze Phase
- Domain 5: Improve and Control Phases
- Exam Format, Fees, and Scoring Mechanics
- Sequencing Your Preparation by Domain
- Using Your Open-Book Privileges Well
- Where the Domains Show Up on the Job
- Frequently Asked Questions
- The exam has 80 scored questions split 20/14/15/17/14 across the five domains, plus 10 unscored questions.
- Six Sigma Fundamentals carries the most scored questions (20), followed by Analyze Phase (17).
- Passing requires 550 scaled points out of 750, not a fixed percentage of correct answers.
- The exam is open book: securely bound references and notes are allowed, and tabs are permitted.
How the CSSYB Blueprint Is Built
The ASQ Certified Six Sigma Yellow Belt exam is organized around a Body of Knowledge (BoK), and the version currently linked from ASQ's certification brochure is the 2022 CSSYB Body of Knowledge. Everything on the exam traces back to five domains. Understanding how those domains are weighted, and how they map to the DMAIC improvement cycle, is the most efficient way to decide where your study hours should go.
ASQ publishes the allocation as scored-question counts rather than percentages, so this guide uses the counts directly. Of the 80 scored items:
| Domain | Scored Questions | Relative Size |
|---|---|---|
| 1. Six Sigma Fundamentals | 20 | Largest |
| 2. Define Phase | 14 | Smaller |
| 3. Measure Phase | 15 | Mid-sized |
| 4. Analyze Phase | 17 | Second largest |
| 5. Improve and Control Phases | 14 | Smaller |
Notice that the computer-delivered exam also contains 10 unscored questions, for 90 in total. You cannot tell which items are unscored, so treat every question as if it counts. If you want a deeper look at how the exam is delivered, see our CSSYB study guide, and for a difficulty read on the blueprint, see how hard the CSSYB exam really is.
Domain 1: Six Sigma Fundamentals
This is the heaviest domain, with 20 scored questions, and it is the one most candidates underestimate because it feels like "background material." In practice it is where the exam checks that you speak the language of continuous improvement fluently, and the vocabulary introduced here is reused in every later domain.
Domain 1: Six Sigma Fundamentals (20 scored questions)
Candidates must understand what Six Sigma is, why organizations adopt it, and how a Yellow Belt fits into a project team.
- The purpose and philosophy of Six Sigma and its connection to quality and customer requirements
- The DMAIC phases and what each one is meant to accomplish
- The roles on a project team, including where a Yellow Belt contributes versus Green Belts, Black Belts, and sponsors
- Lean concepts and the idea of waste, and how Lean and Six Sigma complement each other
- Basic quality tools and the cost-of-poor-quality mindset
Why this domain rewards precision
Fundamentals questions tend to test whether you can distinguish closely related ideas: variation due to common causes versus special causes, defects versus defectives, value-added versus non-value-added activity. Memorizing definitions is not enough; you should be able to classify a short scenario correctly. When a question describes a process, ask yourself which concept it is actually illustrating.
If you are new to the credential itself, our explainers on what CSSYB certification is and what CSSYB stands for provide useful context before you dive into this domain.
Domain 2: Define Phase
The Define Phase carries 14 scored questions. It covers how a project is scoped and chartered before any data is collected. The exam expects you to recognize what belongs in a project definition and how a team confirms it is solving a problem that matters to the customer.
Domain 2: Define Phase (14 scored questions)
Candidates must be able to frame a problem, identify stakeholders, and describe the process at a high level.
- Project charter elements: problem statement, goal statement, scope, and team roles
- Voice of the customer (VOC) and how customer needs translate into critical-to-quality (CTQ) requirements
- High-level process mapping, including SIPOC (suppliers, inputs, process, outputs, customers)
- Stakeholder identification and the basics of project communication
- Project selection logic and expected benefits
Common traps in Define questions
A frequent pattern is the "which of these is a good problem statement?" question. Strong statements describe the observable gap without naming a cause or a solution. If an answer choice already blames a specific machine or recommends a fix, it is almost certainly premature for the Define phase. Likewise, SIPOC questions often ask you to place an item in the correct column, so practice sorting examples into suppliers, inputs, process steps, outputs, and customers quickly.
Domain 3: Measure Phase
The Measure Phase has 15 scored questions. This is where the exam first becomes noticeably quantitative: you must understand how data is collected, what kind of data you have, and how to summarize it. It is also the domain that most directly prepares you for Analyze.
Domain 3: Measure Phase (15 scored questions)
Candidates must understand how a process is documented and measured, and how data is gathered and described.
- Detailed process maps and flowcharts, and how they reveal non-value-added steps
- Types of data (continuous versus discrete) and why the distinction matters for tool choice
- Data collection planning, including sampling concepts and check sheets
- Measurement system concerns such as accuracy and precision
- Descriptive statistics: mean, median, mode, range, and standard deviation
- Basic process performance concepts such as defects per unit and related metrics
Calculation readiness
Because the exam permits a calculator, you should expect a handful of short computations. The on-screen scientific calculator is available in computer-based testing, and approved non-programmable handheld calculators are permitted. Practice with the calculator you plan to use so that functions like square roots and standard deviation steps are second nature. For a printable summary of formulas and definitions, our CSSYB cheat sheet is a handy companion.
Domain 4: Analyze Phase
With 17 scored questions, the Analyze Phase is the second-largest domain and often the one candidates find most demanding. It asks you to interpret data and identify root causes rather than just define terms, so it rewards genuine understanding over rote memorization.
Domain 4: Analyze Phase (17 scored questions)
Candidates must use data and structured tools to find the sources of variation and the root causes of defects.
- Root cause tools such as cause-and-effect (fishbone) diagrams, the 5 Whys, and Pareto charts
- Graphical analysis: histograms, scatter diagrams, run charts, and box plots, and what each pattern suggests
- Basic concepts of correlation versus causation
- Introductory ideas behind hypothesis testing and statistical significance, at a Yellow Belt level
- Identifying and categorizing waste and non-value-added activity in a process
Reading charts is the real skill
Many Analyze questions present a description of a chart or a small data set and ask what conclusion is justified. Pareto charts, for example, are used to separate the vital few causes from the trivial many, so the correct answer usually points to the tallest categories as the place to focus. Scatter diagrams test whether you can describe the direction and strength of a relationship without overclaiming that one variable causes the other.
Because this domain has the second-highest allocation and builds on Measure, it deserves substantial practice time. You can gauge where it sits in the overall effort by reviewing our analysis of the CSSYB pass rate data.
Domain 5: Improve and Control Phases
The final domain combines two DMAIC phases into one block of 14 scored questions. Improve is about generating and testing solutions; Control is about making sure the gains stick. Together they test whether you understand how a project ends well rather than just how it begins.
Domain 5: Improve and Control Phases (14 scored questions)
Candidates must understand how to develop, pilot, and sustain process improvements.
- Improvement techniques: brainstorming, process simplification, and basic error-proofing (mistake-proofing)
- Lean tools that support flow, such as 5S, visual management, and reducing waste
- Piloting a solution and evaluating results before full rollout
- Control tools: control charts, control plans, and standard work or documented procedures
- Sustaining gains through training, monitoring, and handing the process back to its owner
Improve versus Control
A reliable way to separate these phases on the exam: Improve questions ask what change to make and how to test it, while Control questions ask how to detect drift and keep the change in place. Control charts are the signature Control tool; know that they distinguish ordinary variation from signals that warrant investigation. Error-proofing is the signature Improve idea: design the process so mistakes are prevented or immediately caught.
Exam Format, Fees, and Scoring Mechanics
Knowing the domains is only half the picture. You should also understand the conditions under which you will be tested. The computer-delivered exam has 90 multiple-choice questions, of which 80 are scored and 10 are unscored. Examination time is two hours and 18 minutes within a two-hour 30-minute appointment, and the exam is offered in English only. A paper-and-pencil alternative has 80 questions and a two-hour examination, also in English.
| Item | Computer-Based | Paper-and-Pencil |
|---|---|---|
| Total questions | 90 (80 scored, 10 unscored) | 80 |
| Exam time | 2 hours 18 minutes (within a 2.5-hour appointment) | 2 hours |
| Language | English only | English only |
Delivery options and what you can bring
Computer-based testing is delivered at Prometric test centers or through ProProctor live remote proctoring in eligible locations; ASQ's computer-based testing page lists country restrictions, so check eligibility before planning. You must present government-issued photo identification with a matching name and signature. Test centers provide scratch paper and pencils, but remote testing works differently: physical scratch paper and writing implements are prohibited, and you use an electronic Scratchpad instead. Do not assume the test-center rule applies if you test remotely.
Fees and retakes
The 2026 Computer-Based Testing Exam Application lists USD 434 for nonmembers and USD 334 for ASQ members for the initial exam, and USD 234 for a retake in either category. Fees are subject to change, so confirm before you register. A reduced-rate retake must occur within two years of your last attempt and cannot fall in the same testing window. For a full cost breakdown, see our CSSYB certification cost guide, and for scheduling details, our page on exam dates and testing windows.
How scoring works
You pass with 550 scaled points out of 750. This is a scaled score, not a fixed percentage of correct answers, so you should not budget your effort around a magic raw number. Our explainer on the CSSYB passing score goes deeper. For context, the issuer-published historical pass rates are 80% in 2022, 81% in 2023, and 83% in 2024; 2024 is the latest year in the retrieved table and should not be read as a 2026 figure.
Sequencing Your Preparation by Domain
The domains follow the DMAIC order, and that order is also a sound study order because each phase feeds the next. Here is a domain-driven way to schedule roughly five weeks, weighted toward the larger blocks. Adjust the pace to your own background.
Six Sigma Fundamentals
- Learn DMAIC, roles, Lean waste, and common-versus-special-cause variation
- Build a vocabulary list; this domain's 20 questions reuse every term later
Define and Measure
- Practice charters, VOC to CTQ, and SIPOC sorting
- Work through data types, sampling, and descriptive statistics with your calculator
Analyze Phase
- Interpret Pareto, scatter, histogram, and run chart descriptions
- Drill root cause tools and the correlation-versus-causation distinction
Improve and Control
- Study error-proofing, 5S, pilots, control charts, and control plans
- Contrast what each phase is trying to achieve
Mixed Review and Reference Prep
- Take timed mixed-domain practice sets
- Finalize your tabbed reference materials and recheck weak domains
For a broader plan that pairs well with this domain order, see our CSSYB study guide, and consider our overview of CSSYB training options if you prefer instructor-led learning.
Using Your Open-Book Privileges Well
The CSSYB is an open-book exam. You may bring securely bound references and notes, and ASQ's rules permit book tabs. This changes how you should prepare: the goal is not to memorize every formula but to know where to find it fast and to understand concepts well enough to apply what you find.
Key Takeaway
Organize your reference by domain, using tabs that mirror the five domain names. Under each tab, keep a short list of definitions, formulas, and tool descriptions. With 90 questions in 2 hours 18 minutes, you have limited time per item, so a well-tabbed reference saves minutes only if you have practiced using it.
Remember that the materials must be securely bound; loose sheets are a risk. Build your reference early and rehearse with it during practice exams so that lookup becomes a quick confirmation rather than a time sink. Questions that test pure understanding, such as choosing the right tool for a scenario, cannot be solved by lookup alone, which is why conceptual study still matters.
Where the Domains Show Up on the Job
The Yellow Belt is typically a credential for team members who support improvement projects rather than lead them, so the domains map to everyday contributions. Define skills help you participate in scoping and understanding customer needs. Measure and Analyze skills help you collect clean data and read the charts your Green or Black Belt shares. Improve and Control skills help you carry out pilots and maintain standard work after a project closes.
Roles that value this knowledge span manufacturing, healthcare, logistics, financial services, and government operations, anywhere continuous improvement or quality is a recurring responsibility. For a look at opportunities, see CSSYB jobs, and for earnings context, our CSSYB salary guide and ROI analysis explore the value question in detail.
When you are ready to test yourself against realistic questions organized by domain, our CSSYB practice tests let you drill each content area and then simulate a full mixed exam.
Frequently Asked Questions
Six Sigma Fundamentals has the largest allocation with 20 scored questions, followed by the Analyze Phase with 17. Measure has 15, while Define and Improve and Control each have 14. The total is 80 scored questions.
The official source publishes scored-question counts rather than percentages, so this guide uses those counts. Any percentage you see elsewhere is a calculation, not an official weight.
No. The computer-delivered exam has 90 questions, 80 scored and 10 unscored, but you cannot tell which are which. Answer every question as though it counts toward your score.
Yes. The exam is open book, and securely bound references and notes are allowed, with book tabs permitted under ASQ's rules. You also need valid government-issued photo identification, and your calculator must be an approved non-programmable model or the on-screen scientific calculator.
The currently linked Certified Six Sigma Yellow Belt certification brochure contains the 2022 CSSYB Body of Knowledge. Always check ASQ's certification page for the latest version before you finalize your study plan, and remember that ASQ notes the subtext is not all-inclusive of possible exam content.