Lean Six Sigma Yellow Belt Practice Test

80 questions of our own, split like the real exam's five sections, with the source under every answer.

Which role leads problem-solving projects and trains and coaches the project teams?

Pick an answer, then press Check answer. Then you see Correct or Not quite, with the reason. Keys: A to D pick, Enter checks.

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Exam mode: 80 questions, 138 minutes.

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Unofficial practice questions, not affiliated with ASQ (the American Society for Quality). Bank checked October 7, 2026.

The real exam, as its owner describes it

Questions
80
Time limit
138 minutes
Fee
$434. ASQ members save $100.
Retakes
$234, a reduced fee offered for two years after an attempt
Languages
English
Format
Multiple choice and open book: each candidate brings their own reference materials.
On computer
90 questions, of which 80 are scored and 10 are not, in 2 hours 18 minutes of exam time.
On paper
80 questions in two hours.
Scoring
A scaled score: 550 points of a possible 750 are needed.
Requirements
None. No education or work experience is required.

Checked October 7, 2026 against ASQ's Six Sigma Yellow Belt certification page and its Exam Results FAQs. Rules change, so confirm with the agency itself before your test.

ASQ's Six Sigma Yellow Belt certification page

Next step A harder set: Black Belt practice testLean Six Sigma questions by DMAIC phase

All 80 questions

Six Sigma Fundamentals 20

  • A brainstorm leaves a team with 40 ideas. Which tool narrows the list to the few the group ranks highest? ASQ Quality Resources, "Multivoting"
  • A customer sends back a faulty unit under warranty. Which category of the cost of poor quality is this? ASQ Quality Glossary, entry "Cost of poor quality (COPQ)"
  • A fixture is shaped so that a part can only be loaded the right way round. Which lean method is this? ASQ Quality Glossary, entry "Poka-yoke"
  • A form has 5 fields that can each be wrong. A check of 400 forms finds 30 errors. What is the DPMO? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section I.E.2
  • A team has members from purchasing, production and shipping. What type of team is it? ASQ Quality Glossary, entry "Cross functional"
  • A value stream map is drawn in two stages. The first follows the product from start to finish. What is the second? ASQ Quality Glossary, entry "Value stream mapping"
  • An audit finds 18 defects in 120 invoices. What is the defects per unit (DPU)? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section I.E.2
Show all 80 questions (73 more)

Six Sigma Fundamentals, continued

  • The body of knowledge gives the purpose of Six Sigma in two words. What is it? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section I.A
  • The body of knowledge lists five stages of team evolution. Which one is last? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section I.D.2
  • Finished parts sit for two days waiting for a signature, and a team removes the wait. Which purpose of lean does that serve? ASQ Quality Glossary, entry "Eight wastes"
  • In a kanban system, what tells the earlier operation to send more material? ASQ Quality Glossary, entry "Kanban"
  • On a scatter diagram, which variable goes on the x-axis? ASQ Quality Glossary, entry "Scatter diagram"
  • What do team members do first in the nominal group technique? ASQ Quality Glossary, entry "Nominal group technique"
  • What do the letters of DMAIC stand for, in order? ASQ Quality Glossary, entry "DMAIC"
  • What is the numerical goal of a process that runs at a 6-sigma level? ASQ Quality Resources, "What is Six Sigma?"
  • Which chart ranks causes from the most significant to the least significant? ASQ Quality Glossary, entry "Pareto chart"
  • Which line describes what a Yellow Belt usually does on a project? ASQ Quality Resources, "Six Sigma Belts, Executives and Champions"
  • Which role leads problem-solving projects and trains and coaches the project teams? ASQ Quality Resources, "Six Sigma Belts, Executives and Champions"
  • Which tool is also known as the Ishikawa diagram or the fishbone diagram? ASQ Quality Glossary, entry "Cause and effect diagram"
  • Who has the responsibility and the authority to make sure a process meets its requirements? ASQ Quality Glossary, entry "Process owner"

Define Phase 14

  • A customer says, "I want my order fast." What turns that need into a critical-to-quality (CTQ) characteristic? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section II.A.1
  • After a brainstorm, which tool sorts many ideas by their natural groupings? ASQ Quality Resources, "Affinity Diagram"
  • In a SIPOC diagram, how much detail does the "process" block carry? ASQ Quality Resources, "SIPOC+CM Diagram"
  • In SIPOC, what does the S stand for? ASQ Quality Glossary, entry "SIPOC diagram"
  • What does a Gantt chart show? ASQ Quality Glossary, entry "Gantt chart"
  • What is a charter? ASQ Quality Glossary, entry "Charter"
  • What is a supply chain? ASQ Quality Glossary, entry "Supply chain"
  • What is the "voice of the customer"? ASQ Quality Glossary, entry "Voice of the customer"
  • When are tollgate reviews held in a DMAIC project? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section II.B.5
  • When in the study of a process is a SIPOC diagram used? ASQ Quality Resources, "SIPOC+CM Diagram"
  • Which four parts of a project charter does the body of knowledge list? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section II.B.1
  • Which planning tool lays out tasks and subtasks as a hierarchy that leads to an objective? ASQ Quality Glossary, entry "Tree diagram"
  • Which tool lays out the sequence of activities in a project and is used to find the critical path? ASQ Quality Glossary, entry "Arrow diagram"
  • Why does a team carry out a stakeholder analysis in the Define phase? ASQ Quality Resources, "The Define, Measure, Analyze, Improve, Control (DMAIC) Process"

Measure Phase 15

  • A gauge study describes measurement variation by location and by width. Which terms describe location? ASQ Quality Resources, "Gage Repeatability and Reproducibility"
  • A report says "162 defects". Which kind of numerical data is that? ASQ Quality Glossary, entry "Data"
  • Against a reference weight, a scale reads 0.3 g high on average. Which measurement term names this? NIST/SEMATECH e-Handbook of Statistical Methods, section 2.1.1.3, Bias and Accuracy
  • An inspector makes a tally mark on a form each time a scratch, a dent or a stain is found. What is the form? ASQ Quality Glossary, entry "Check sheet"
  • Five boxes weigh 48, 52, 47, 55 and 50 kg. What is the range? NIST/SEMATECH e-Handbook of Statistical Methods, section 1.3.5.6, Measures of Scale
  • Five orders took 4, 7, 7, 9 and 13 days. What is the mean? NIST/SEMATECH e-Handbook of Statistical Methods, section 1.3.5.1, Measures of Location
  • How is the standard deviation related to the variance? NIST/SEMATECH e-Handbook of Statistical Methods, section 1.3.5.6, Measures of Scale
  • In measurement, what does greater precision mean? ASQ Quality Glossary, entry "Precision"
  • One inspector measures the same part several times with one gauge and gets slightly different values. What is this variation called? ASQ Quality Glossary, entry "Repeatability"
  • Seven daily defect counts are 4, 4, 4, 6, 7, 9 and 9. What is the mode? NIST/SEMATECH e-Handbook of Statistical Methods, section 1.3.5.1, Measures of Location
  • Six cycle times in minutes are 12, 15, 9, 21, 18 and 30. What is the median? NIST/SEMATECH e-Handbook of Statistical Methods, section 1.3.5.1, Measures of Location
  • Three inspectors measure the same part with the same gauge, and their results differ from person to person. What is this variation called? ASQ Quality Glossary, entry "Reproducibility"
  • Which of these is one of the critical parts of a plan for collecting data? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section III.B.1
  • Which technique questions a chosen sample of people to get data on a process, product or service? ASQ Quality Glossary, entry "Survey"
  • Why is the measurement system checked before a baseline is set? ASQ Quality Resources, "The Define, Measure, Analyze, Improve, Control (DMAIC) Process"

Analyze Phase 17

  • A force field analysis lists factors in two groups. What are they? ASQ Quality Glossary, entry "Force field analysis"
  • A machine jams because a wrong batch of material was loaded. What kind of cause is behind this variation? ASQ Quality Glossary, entry "Special causes"
  • A permanent fix is in place. Which step of the corrective action process confirms that it is effective? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section IV.C
  • A process step that the customer would be unwilling to pay for, given the option, is called what? ASQ Quality Glossary, entry "Nonvalue added"
  • A scatter plot shows defects rising as humidity rises. What can the team conclude from the plot alone? NIST/SEMATECH e-Handbook of Statistical Methods, section 1.3.3.26, Scatter Plot
  • A test rejects the null hypothesis although it is in fact true. What is this mistake called? ASQ Quality Glossary, entry "Type I error"
  • Each unit in a sample is either defective or not. Which distribution does the proportion defective in the sample follow? NIST/SEMATECH e-Handbook of Statistical Methods, section 7.2.4, Does the proportion of defectives meet requirements
  • FMEA severity is usually rated from 1 to 10. What does a 10 mean? ASQ Quality Resources, "Failure Mode and Effects Analysis (FMEA)"
  • In the corrective action process, what comes straight after the problem is identified? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section IV.C
  • In the five whys technique, how many times is "why" asked? ASQ Quality Glossary, entry "Five whys"
  • No defect has occurred, but a team studies its process map to find where one could. What kind of action follows? ASQ Quality Glossary, entry "Preventive action"
  • What happens at step D3 of the eight disciplines (8D) model? ASQ Quality Resources, "Eight Disciplines (8D)"
  • What is done in sort (seiri), the first of the five S's? ASQ Quality Resources, "What are the Five S's (5S) of Lean?"
  • What is regression analysis used to find? ASQ Quality Glossary, entry "Regression analysis"
  • Which of the five S's means keeping to the first four as a habit, without being told? ASQ Quality Resources, "What are the Five S's (5S) of Lean?"
  • Which three ratings go into the risk priority number in an FMEA? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section IV.A.2
  • Which words describe the shape of a normal distribution? ASQ Quality Glossary, entry "Normal distribution (statistical)"

Improve and Control Phases 14

  • A PDCA trial shows the change did not work. What does the cycle say to do? ASQ Quality Resources, "Plan-Do-Check-Act (PDCA) Cycle"
  • A process step has been changed. What does document control call for? ASQ, Certified Six Sigma Yellow Belt Body of Knowledge (2022), section V.B.3
  • A single point falls above the upper control limit. What should the team do? ASQ Quality Resources, "Control Chart"
  • A team compares the results of a trial with what it had predicted. Which step of PDCA is this? ASQ Quality Glossary, entry "Plan-do-check-act (PDCA) cycle"
  • An operator adjusts the machine after every point, although all the points are inside the control limits. What is the likely result? ASQ Quality Glossary, entry "Tampering"
  • Eight points in a row fall on the same side of the centerline, all inside the control limits. What does this show? ASQ Quality Resources, "Control Chart"
  • On an X-bar and R chart, what does the R chart follow? ASQ Quality Glossary, entry "Range chart (R chart)"
  • On an X-bar and R chart, what does the X-bar chart follow? ASQ Quality Glossary, entry "Average chart"
  • What does the Japanese term kaizen mean? ASQ Quality Glossary, entry "Kaizen"
  • What happens in the "do" step of the plan-do-check-act cycle? ASQ Quality Resources, "Plan-Do-Check-Act (PDCA) Cycle"
  • What is a control plan for? ASQ Quality Resources, "The Define, Measure, Analyze, Improve, Control (DMAIC) Process"
  • What is a kaizen event meant to do? ASQ Quality Resources, "The Define, Measure, Analyze, Improve, Control (DMAIC) Process"
  • Which benefit of standard work instructions does the glossary name? ASQ Quality Glossary, entry "Standard work instructions"
  • Which of these does the Control phase of DMAIC establish? ASQ Quality Resources, "The Define, Measure, Analyze, Improve, Control (DMAIC) Process"

How this list was compiled: Our own questions, written to the five sections of the Certified Six Sigma Yellow Belt Body of Knowledge (2022) that ASQ publishes (https://www.asq.org/cert/resource/pdf/certification/cssyb-cert-insert.pdf, linked from https://asq.org/cert/six-sigma-yellow-belt). Facts were read in that outline, in the ASQ Quality Glossary and Quality Resources pages (asq.org/quality-resources) and in the NIST/SEMATECH e-Handbook of Statistical Methods (itl.nist.gov/div898/handbook), all on 2026-10-07. Each question names the section, entry or page it was written from. Licence: Own work. Every question, answer choice and explanation was written for this site from the public sources named on it. Nothing is taken from the exam, from its owner's question bank, study guide, handbook or courses, or from another practice test.

How it works

This Lean Six Sigma Yellow Belt practice test follows the body of knowledge ASQ publishes for its Yellow Belt exam. It is unofficial and not affiliated with, endorsed by or sponsored by ASQ (the American Society for Quality).

Read the full guide

The same split as the exam

The outline gives Six Sigma Fundamentals 20 questions, Define 14, Measure 15, Analyze 17, and Improve and Control 14. This bank holds the same counts, so exam mode asks all 80 in 2 hours 18 minutes, the time allowed on computer.

What a Yellow Belt is asked

Most topics are tested at the level the outline calls "understand": the roles, the phases, what each tool is for. A smaller group is "apply": the quality tools, basic statistics, defects per unit and DPMO, where a question hands you numbers.

  • ASQ's exam is open book, and you bring your own references. Practice finding a definition quickly as well as recalling it.
  • Keep the measurement pairs apart: repeatability is one person repeating, reproducibility is different people; accuracy is closeness to a reference, precision is spread.

Questions and answers

How many questions are on the Six Sigma Yellow Belt exam?

ASQ's computer-delivered exam has 90 multiple-choice questions, 80 scored and 10 unscored, with 2 hours 18 minutes of exam time. The paper version has 80 questions in two hours.

What score passes the Yellow Belt exam?

ASQ reports a scaled score and asks for 550 points of a possible 750. It does not give that as a number of questions right, so this page shows your count and no pass or fail.

Is this a free Lean Six Sigma Yellow Belt practice test?

Yes. All 80 questions are free with no sign-up, and your answers stay in this browser. Nothing here comes from the exam, from ASQ's question bank or study guide, or from another practice site.

Does one Six Sigma Yellow Belt practice test fit every certifying body?

No. Several bodies certify Six Sigma belts, and there is no single standard body. This page follows ASQ's outline, dated 2022. For another body's exam, check its own outline, because the sections and the depth can differ.

Who can take the Yellow Belt exam?

ASQ sets no education or experience requirement. It describes the certification as aimed at people new to Six Sigma who have a small role, an interest, or a need for foundational knowledge.

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