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A four-step process has first time yields of 99%, 95%, 90%, and 85%. Which conclusion is best?

Rolled throughput yield will be much lower than the best individual step yield

Rolled throughput yield must equal 99%

Averages are always better than multiplying yields

The process has no hidden factory because each step is above 80%

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Key Facts: ICYB Exam

graded exam questions

IASSC Yellow Belt Certification page

2 hours

allotted exam time

IASSC Yellow Belt Certification page

70%

minimum passing score

IASSC Yellow Belt Certification page

$289

on-demand web-based voucher listed in IASSC store

IASSC Yellow Belt voucher product page

The IASSC Certified Lean Six Sigma Yellow Belt exam is a 60-question, closed-book, proctored exam with a 2-hour time limit and a 70% minimum passing score. IASSC says some forms may include up to 6 non-graded questions. There are no prerequisites. The public Yellow Belt Body of Knowledge is organized around Define, Measure, and Control rather than a published percentage-weighted outline.

Sample ICYB Practice Questions

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

1In Lean Six Sigma, what is the primary purpose of the DMAIC approach?

A.To provide a structured method for improving an existing process

B.To replace every manual process with automation

C.To certify every employee as a Black Belt

D.To remove all inspection from production

Explanation: DMAIC is a structured improvement method used for existing processes. At Yellow Belt level, the emphasis is on understanding the flow of Define, Measure, Analyze, Improve, and Control and supporting team activities within that structure.

2Which statement best describes the common Six Sigma goal of reducing variation?

A.Making every process step faster even if defects increase

B.Making process outputs more consistent and closer to customer requirements

C.Replacing customer requirements with internal opinions

D.Accepting more rework as long as production volume rises

Explanation: Six Sigma focuses on reducing variation and defects so outputs meet requirements more consistently. Lean Six Sigma combines this variation focus with Lean's emphasis on flow and waste reduction.

3What does the problem-solving expression Y = f(x) mean in a Lean Six Sigma project?

A.Outputs are a function of process inputs and factors

B.Yield is always fixed regardless of inputs

C.Every project must use advanced regression

D.The customer decides the statistical formula

Explanation: Y = f(x) means the important output or result is driven by input variables and process factors. Improvement work looks for the vital x variables that influence the Y the customer or business cares about.

4Which voice captures what external customers need, expect, or complain about?

A.Voice of the Business

B.Voice of the Process

C.Voice of the Customer

D.Voice of the Supplier

Explanation: Voice of the Customer captures customer needs, expectations, preferences, and dissatisfaction. It is often translated into Critical to Quality characteristics so the team can measure what matters.

5What is a Critical to Quality characteristic?

A.A measurable requirement that is important to customer satisfaction

B.A list of team member vacations

C.A random sample selected after the project is finished

D.A financial statement used only by accounting

Explanation: A CTQ is a measurable product or process characteristic that must meet a requirement important to customers. CTQs help convert broad customer statements into specific targets the project can measure and improve.

6Which role most commonly serves as a part-time team member supporting Lean Six Sigma projects?

A.Master Black Belt

B.Yellow Belt

C.Executive Champion

D.Certification auditor

Explanation: A Yellow Belt usually supports improvement projects as a team member and applies basic Lean Six Sigma tools in a limited or supportive context. More complex project leadership is typically handled by Green Belts or Black Belts.

7Which item is normally part of a Lean Six Sigma project charter?

A.Problem statement and project scope

B.Every raw data record collected during Control

C.The final control chart after sustainment

D.A guarantee that the first solution will work

Explanation: A project charter commonly identifies the problem, scope, goals, business case, timeline, and team. It helps the project start with shared expectations before detailed measurement and analysis begin.

8Which Lean concept focuses on eliminating activities that do not add value from the customer's perspective?

A.Waste reduction

B.Batch inflation

C.Scope expansion

D.Random inspection

Explanation: Lean seeks to improve flow and reduce waste, meaning activities that consume resources without adding customer value. In Lean Six Sigma, this complements Six Sigma's focus on variation and defects.

9Which option is one of the seven wastes listed in the IASSC Yellow Belt BoK?

A.Overproduction

B.Balanced flow

C.Customer focus

D.Standard work

Explanation: Overproduction is a classic Lean waste and is included in the IASSC Yellow Belt BoK's waste list. It often creates additional inventory, waiting, handling, and hidden defects.

10In 5S, which activity is most closely associated with removing unnecessary items from the work area?

A.Sort

B.Shine

C.Standardize

D.Self-discipline

Explanation: Sort is the 5S activity that separates needed items from unneeded items and removes what is not necessary. This makes abnormalities easier to see and improves the foundation for the other 5S steps.

About the ICYB Exam

The ICYB exam validates foundational Lean Six Sigma knowledge for professionals who support improvement projects or lead limited projects in a part-time role. The official Yellow Belt Body of Knowledge covers Define, Measure, and Control topics including Lean waste, 5S, CTQs, COPQ, basic metrics, process mapping, FMEA, MSA, capability concepts, Kanban, Poka-Yoke, and control plans.

Assessment

Closed-book, proctored exam with multiple-choice and true/false questions. Some forms may include up to 6 non-graded questions.

Time Limit

2 hours

Passing Score

70%

Exam Fee

$289 on-demand web-based voucher; IASSC certification page also references a $250 voucher purchase path (International Association for Six Sigma Certification (IASSC))

ICYB Exam Content Outline

Not publicly weighted by IASSC

Define Phase

Meanings and history of Six Sigma, project deliverables, Y = f(x), voice of the customer/business/employee, roles and responsibilities, process basics, CTQ, COPQ, Pareto, DPU, DPMO, FTY, RTY, cycle time, project chartering, project metrics, financial benefits, Lean, waste, and 5S.

Not publicly weighted by IASSC

Measure Phase

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

Not publicly weighted by IASSC

Control Phase

Control methods for 5S, Kanban, Poka-Yoke, cost-benefit analysis, control plan elements, and response plan elements.

How to Pass the ICYB Exam

What You Need to Know

Passing score: 70%
Assessment: Closed-book, proctored exam with multiple-choice and true/false questions. Some forms may include up to 6 non-graded questions.
Time limit: 2 hours
Exam fee: $289 on-demand web-based voucher; IASSC certification page also references a $250 voucher purchase path

Keys to Passing

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

ICYB Study Tips from Top Performers

1Use the official IASSC Yellow Belt BoK as the checklist: Define, Measure, and Control are the core sections.

2Memorize and practice basic metrics: DPU, DPMO, first time yield, rolled throughput yield, and cycle time.

3Know the practical difference between VOC, VOB, and VOE, and how broad needs become measurable CTQs.

4Practice reading simple process maps, SIPOC diagrams, value stream maps, fishbone diagrams, Pareto charts, histograms, and scatter plots.

5Understand MSA vocabulary: accuracy, precision, bias, linearity, stability, repeatability, reproducibility, variable MSA, and attribute agreement.

6For Control, focus on sustainment: 5S controls, Kanban, Poka-Yoke, control plan elements, response plan elements, and cost-benefit tradeoffs.

Frequently Asked Questions

How many questions are on the IASSC Yellow Belt exam?

IASSC states that the Certified Lean Six Sigma Yellow Belt exam has 60 questions. Some forms may also include up to 6 additional non-graded questions.

How much time do I get for the ICYB exam?

The IASSC Yellow Belt certification exam has a 2-hour allotted time.

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

IASSC states that candidates must achieve a minimum score of 70% to earn the IASSC Certified Yellow Belt designation.

Are there prerequisites for the ICYB exam?

No. IASSC states that there are no prerequisites required to sit for the Certified Lean Six Sigma Yellow Belt exam. Training is recommended but not required.

What does the IASSC Yellow Belt Body of Knowledge cover?

The public IASSC Yellow Belt Body of Knowledge is organized into Define, Measure, and Control. It includes Six Sigma basics, Lean waste and 5S, project chartering, core metrics, process mapping, FMEA, statistics, MSA, process capability, Kanban, Poka-Yoke, control plans, and response plans.

Does IASSC publish ICYB domain percentages?

No public percentage weighting was found in the official IASSC Yellow Belt Body of Knowledge. The practice content here follows the three official BoK sections and their listed topics.