LSS Green Belt · PeopleCert · Improve · Bank updated 2026-09-19
LSS Green Belt practice questions: Improve
5 free questions from 30 on this area · answer and explanation for each · no sign-up
These 5 questions come from the Improve section of our LSS Green Belt bank (30 questions on this area, which carries 20% of the real exam). Every question is original, with the correct answer explained and linked to the source it is drawn from.
Free: 6 questions in study mode, no card. All 30 Improve questions and the full LSS Green Belt bank: $15 one-time.
1/5 · Improve · easy
In Lean Six Sigma, which term specifically refers to designing a process step or device so that an error is either physically impossible to make or is immediately and automatically detected before a defect is produced?
AKanban signal
BPoka-yoke (mistake-proofing)
CControl chart
DKaizen event
2/5 · Improve
A team used a Fishbone diagram and 5 Whys to trace high customer complaint rates to an undocumented, inconsistent hand-off procedure between shifts. Which action best reflects proper root-cause-to-improvement linkage in the Improve phase?
AIncrease the sampling frequency in the control chart monitoring complaint counts.
BDesign and pilot a standardized shift hand-off checklist that directly addresses the identified root cause.
CRetrain all employees company-wide on general customer service skills to be safe.
DAdd an additional inspection step at the end of the process to catch complaints before they reach the customer.
Answer: B. Root-cause-to-improvement linkage means the solution selected must directly eliminate or mitigate the specific root cause validated during analysis, not a generic or downstream fix. Here, the root cause is a missing standardized hand-off procedure, so the improvement action should create and pilot that standard, rather than adding inspection, generic training, or increased monitoring.
Source: the IASSC Lean Six Sigma Green Belt Body of Knowledge (ILSSBOK, PeopleCert syllabus) — Improve
3/5 · Improve · hard
A simple linear regression model for predicting monthly scrap cost (Y, in dollars) from production volume in thousands of units (X) is Ŷ = 500 + 25X. What is the predicted scrap cost when production volume is 10 thousand units?
A$2,500
B$250
C$525
D$750
4/5 · Improve · easy
When a Green Belt team implements a Poka-Yoke (mistake-proofing) device at a process step, what is the primary purpose of that device?
ATo make it impossible or highly unlikely for an error to occur, or to detect the error immediately when it does occur, before a defect is created or passed downstream
BTo increase the sampling frequency of quality inspectors auditing finished output
CTo eliminate the need for any operator training on the process
DTo provide statistical evidence that the process has achieved a Cpk of at least 1.33
Answer: A. Poka-Yoke devices are built into a process so that errors either cannot physically occur or are caught the instant they occur, moving quality control from after-the-fact inspection to prevention or immediate detection at the source. This reduces dependence on operator memory or vigilance and on downstream sampling inspection.
Source: the IASSC Lean Six Sigma Green Belt Body of Knowledge — Improve
5/5 · Improve · easy
Which guideline is a fundamental ground rule for an effective brainstorming session when a Green Belt team is generating candidate improvement ideas?
ADefer judgment and criticism during idea generation, encouraging a high quantity of ideas before evaluating their quality
BOnly the process owner should propose ideas, since other team members lack the authority to suggest changes
CIdeas should be immediately ranked and voted on as soon as each one is proposed, before the group moves to the next idea
DEvery idea generated must include a supporting statistical justification before it can be recorded
Answer: A. Effective brainstorming separates idea generation from idea evaluation: participants are encouraged to freely contribute many ideas without criticism or immediate justification, and prioritization tools such as multivoting or a selection matrix are applied afterward to narrow the list.
Source: the IASSC Lean Six Sigma Green Belt Body of Knowledge — Improve
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