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

• Online: open https://thematthub.github.io/lssgb-exam-trainer/.
• From disk: download or clone the repo and double-click index.html. You need no install, server or internet connection.
• Local server: run python -m http.server 8000 in the repo folder, then open http://localhost:8000.

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.