LSS Green Belt · PeopleCert · Updated September 2026
LSS Green Belt practice questions
Original & expert-reviewed · explanation for every option · no dumps
Practise LSS Green Belt with original, expert-reviewed questions — each with an explanation for every option, linked to the source, across the full exam blueprint. No dumps, no ads, 6 free to start.
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A representative slice of the bank: every DMAIC phases, mixed difficulty (hard ones included). Answers are one tap away — no email wall.
1/10 · Define
In the Six Sigma problem-solving strategy expressed as Y = f(X), which statement correctly describes the roles of Y and the X's?
AY and X are interchangeable labels with no fixed meaning and can be swapped depending on the report template used.
BX is the customer-facing output measured on a control chart, while Y is an uncontrollable noise variable that cannot be studied.
CY is the dependent output or result that the team wants to improve, and the X's are the independent process inputs or variables that drive that result.
DY always represents the dollar cost of poor quality, and X always represents the process sigma level.
Show answer & explanation
C is correct. The Y=f(X) equation is a core Six Sigma concept meaning that an output/result (Y) is a function of one or more input or process variables (X's). Improvement teams work to identify the vital few X's that most influence Y so they can be controlled or optimized. This concept underlies DMAIC's shift from managing outputs after the fact to controlling the inputs that cause them.
↗ the IASSC Lean Six Sigma Green Belt Body of Knowledge (ILSSBOK, PeopleCert syllabus) — Define
2/10 · Measure
A Green Belt is beginning a new process improvement project and wants to establish the high-level boundaries of the process, identify the major inputs and outputs, and confirm who supplies inputs and who receives outputs — before drilling into detailed process steps. Which tool is MOST appropriate for this purpose?
ASIPOC diagram
BA detailed, step-by-step (as-is) process map
CControl chart
DCause-and-effect (fishbone) diagram
Show answer & explanation
3/10 · Analyze
A Green Belt wants to narrow down a long list of potential X's affecting scrap rate before running formal hypothesis tests. She wants a graphical technique that studies existing process data to identify whether variation is mostly within a unit, between units, or over time, without deliberately changing any process inputs. Which technique should she use?
AMulti-vari analysis
BDesign of Experiments (DOE)
CFailure Mode and Effects Analysis (FMEA)
DSimple linear regression
Show answer & explanation
4/10 · Improve
A plant manager notices that months with higher ice cream sales in the company cafeteria also have higher counts of heat-related safety incidents on the shop floor. He concludes that ice cream sales are causing the safety incidents. Which statement best describes the flaw in his conclusion?
AThe manager has correctly identified a causal relationship, since the two variables move together consistently across all months.
BThe relationship must be pure random noise with no underlying explanation, since ice cream cannot logically relate to heat incidents.
CBoth variables are likely being driven by a third, lurking variable such as summer heat, so correlation alone does not establish causation.
DBecause the correlation is strong, no further investigation or experimentation is needed before restricting ice cream sales.
Show answer & explanation
5/10 · Control
5S is often described as having a 'sustain' pillar that differs in nature from the first four S's. Which statement correctly describes the primary purpose of the Sustain (Shitsuke) pillar?
AIt defines the physical layout rules for tools and materials so that everything has a designated, labeled location.
BIt focuses on removing unnecessary items from the workplace to reduce clutter.
CIt builds the discipline and habits, reinforced by periodic audits and leadership behavior, needed to make the first four S's a permanent part of daily work.
DIt establishes the documented cleaning schedules and checklists used during the Shine step.
Show answer & explanation
6/10 · Define
A manufacturer performs incoming inspection on raw materials before they enter production, checking for conformance to specification. Under the Cost of Poor Quality (COPQ) framework, this activity is classified as which cost category?
AAppraisal cost
BInternal failure cost
CExternal failure cost
DPrevention cost
Show answer & explanation
7/10 · Measure
A team has completed a SIPOC and now needs to document the exact sequence of steps, decision points, and handoffs within the process boundaries defined by the SIPOC, so they know exactly where in the process to collect data. Which activity should the team perform next?
ACreate a detailed, as-is process map of the current process
BBuild a full Failure Modes and Effects Analysis (FMEA)
CCalculate the process Cpk
DConduct a Gage R&R study on the measurement system
Show answer & explanation
8/10 · Analyze
According to the Central Limit Theorem, as the sample size (n) used to compute sample means increases, the distribution of those sample means...
ATakes on a shape that depends on which hypothesis test is later applied to the data
BBecomes identical in shape to the underlying population distribution, whatever that shape is
CBecomes increasingly skewed as more observations are averaged into each sample
DApproaches a normal distribution, regardless of the shape of the underlying population distribution
Show answer & explanation
9/10 · Define · hard
A manufacturer ships a batch of parts that are later found to be defective by the customer, who returns them under warranty for replacement and reimbursed shipping costs. Under the Cost of Poor Quality (COPQ) framework, this is an example of which category?
AInternal failure cost
BAppraisal cost
CPrevention cost
DExternal failure cost
Show answer & explanation
10/10 · Define · hard
A hospital wants to reduce the time a patient waits from check-in until being seen by a doctor. The improvement team focuses on eliminating unnecessary handoffs and non-value-added waiting time in the patient flow, rather than reducing variation in a specific measured output. Which methodology's primary focus does this initiative best represent?
ALean, because it targets speed, flow, and the elimination of waste such as waiting and unnecessary handoffs.
BTotal Quality Management (TQM), because it addresses gaps in employee training.
CDesign for Six Sigma (DFSS), because it is used to design an entirely new process from scratch.
DSix Sigma, because it targets defect reduction through statistical process control.
Show answer & explanation
A is correct. Lean and Six Sigma are complementary but have different primary emphases: Lean focuses on speed and flow by eliminating waste (like waiting and unnecessary handoffs), while Six Sigma focuses on reducing variation and defects using statistical methods. Since this initiative targets waiting time and handoffs rather than output variation, it is fundamentally a Lean-focused effort.
↗ the IASSC Lean Six Sigma Green Belt Body of Knowledge (ILSSBOK, PeopleCert syllabus) — Define
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LSS Green Belt practice — FAQ
Is LSS Green Belt the same as ASQ's Six Sigma Green Belt?
No — IASSC/PeopleCert ICGB and ASQ CSSGB are separate certifications with different bodies of knowledge and rules. IASSC requires no project or work experience; ASQ requires a project affidavit or years of experience.
How much statistics does the LSS Green Belt exam require?
Green Belt depth: descriptive statistics, normal distribution, hypothesis testing (p-values, alpha/beta risk), ANOVA-level concepts and simple regression. A formula/reference sheet is provided — interpretation matters more than computation.
Do I need to complete a real project to earn LSS Green Belt?
No — passing the proctored exam is the only requirement, plus recertification every 3 years via a shorter exam.
How many questions is the LSS Green Belt exam and how long is it?
100 multiple-choice and true/false questions (some forms add up to 10 unscored pilot items) in 180 minutes, closed book with a formula/reference sheet provided in the exam interface.
What is the passing score for LSS Green Belt?
The passing score is 70% of total available points (questions carry difficulty weights of 1–3 points). Aim for a consistent 80–85% on realistic practice exams before booking.
What is the LSS Green Belt pass rate?
PeopleCert does not publish official pass rates, so any exact percentage quoted online is unverified. The readiness signal that actually predicts passing: consistently holding 80–85% on realistic, full-length practice exams before you book.
What are the LSS Green Belt eligibility requirements?
None — IASSC/PeopleCert require no training course, work experience or completed project (in contrast to ASQ).
How much does LSS Green Belt cost?
Three official price points for one exam (all verified 22 Sep 2026): IASSC's certification page still says $350, IASSC's own store charges $402 for the Green Belt voucher, and PeopleCert - which owns IASSC and delivers the exam - listed €361, about $415, on the storefront it served us (prices are country-specific and the page states no VAT treatment). Nothing includes training or a practice exam: IASSC's evaluation exam is $78, PeopleCert's mock €62. The recertification voucher is $268 in IASSC's store and €243 at PeopleCert (50 questions, 90 minutes, same 70% pass mark).
How long should I study for LSS Green Belt?
For most candidates, commonly reported 40–80 hours depending on prior statistics background. What matters most is practising questions and analysing why each option is right or wrong — not just reading.
Does the LSS Green Belt certification need recertification?
Every 3 years - a 50-question, 90-minute recertification exam at 70%, max two attempts two weeks apart; $175 on IASSC's policy page but $268 in IASSC's store and €243 via PeopleCert (verified 22 Sep 2026).
Are ExamDeck's LSS Green Belt questions exam dumps?
No — every question is original, written to test the concepts and reviewed before it ships, with an explanation linked to the source for every option. Dumps are stale, often wrong, and against PeopleCert's policies.
ExamDeck is an independent study tool, not affiliated with, endorsed by, or sponsored by PeopleCert. LSS Green Belt and related marks are trademarks of their respective owners, used for identification only. Exam facts checked against official PeopleCert materials (as of September 2026); always confirm current details with the vendor before booking.