LSSGB Exam Trainer
Practise for the IASSC Lean Six Sigma Green Belt exam with 502 fact-checked multiple-choice questions, each option explained.
Open the app · Learner guide
What you can do
- Random: work through all questions in random order, as a round you can leave and resume.
- By topic: run a round on one topic or a whole DMAIC phase; the list shows your score per topic.
- Confirm: in both modes you pick an answer, press Confirm, and see why each of the four options is right or wrong.
- Review mistakes: questions you miss come back the same day, then after 1, 3, 7, 14 and 30 days.
- Exam: a timed mock under IASSC rules, plus a 25-question, 45-minute quick exam.
- Learn: notes, formulas, exam traps and terms for each of the 27 topics, with a search across notes and questions.
- Resources: 54 references made from scratch: 24 diagrams, 12 worked examples, 10 cheat sheets and 8 tables.
Exam facts
- The IASSC Green Belt exam has 100 questions, 3 hours and a 70% pass mark, with about 20 questions per DMAIC phase.
- On the IASSC exam, Improve covers correlation and regression only.
- Design of Experiments (DOE) and five other course topics appear here as bonus topics: you can practise them, and the mock exams leave them out.
Use it
Your progress
Your progress stays in your own browser (localStorage); nothing goes to a server. Each colleague who opens the link gets separate progress. To move yours to another device or browser, use Settings → Export progress, then Import progress on the other side.
Screenshots
Accuracy and sources
An independent reviewer checked every question against its source. Each question shows its source after you answer:
- "Lesson x.y" points to the lesson numbering of the Green Belt course the author took.
- "Web:" names a public source.
- "BoK" points to the IASSC Body of Knowledge.
Found an error? Open a Question error issue with the question id (shown under the explanation, e.g. M2-007) and your source.
Contribute
Fixes and new questions are welcome. CONTRIBUTING.md explains the data format and the content rules. Run node tools/validate.mjs before you open a pull request.
Disclaimer
LSSGB Exam Trainer is an independent study aid, not affiliated with or endorsed by IASSC. The questions are original practice items, not real exam questions.
License
Code: MIT (LICENSE). Content in data/ and assets/: CC BY 4.0 (LICENSE-CONTENT.md). Copyright 2026 Matteo Brunetti.
