Lean Six Sigma · level 1 of 3
Lean Six Sigma Yellow Belt certification
The Yellow Belt is the first level of Lean Six Sigma: understanding the vocabulary, spotting waste and taking a useful part in an improvement project. What you need to know, and what to practise.
Who this level is for
For someone who takes part in improvement projects without leading them: operator, technician, clerk, first-line supervisor, or anyone whose company is starting a Lean initiative.
What the level covers
The Yellow Belt is not a project-leader diploma. It certifies that you share the language: knowing what waste is, telling a pull flow from a push flow, understanding why a workstation is organised according to the 5S and what a team board is for.
It is the level that makes projects possible. An improvement project led by a Green Belt rarely fails on technique; it fails when the people on the shop floor do not see what they are being asked to observe. The Yellow Belt is that foundation, and that is why many companies roll it out widely before training a few Green Belts.
The syllabus covers the fundamentals of Lean, the seven wastes, the 5S, kaizen, visual management, short-interval management, going to the gemba, takt time, the basics of flow and reading an indicator. Statistics stay descriptive: reading a mean, a spread, a chart — not running a hypothesis test.
How to prepare
The pitfall of the Yellow Belt is to revise it like a glossary. Exam questions rarely bear on a definition alone: they describe a situation and ask which of four readings is the right one. Learning “overproduction: producing more than needed” is not enough to decide between overproduction and inventory in a concrete case.
The right unit of revision is therefore the situational question, marked and explained. That is what beltup does: every answer is justified, and the source it comes from is shown under the explanation.
Who awards the certification
There is no single authority for Lean Six Sigma. Several organisations award Yellow Belt certifications, each with its own body of knowledge, exam rules and fees: international professional associations, independent certification bodies, schools, training providers.
The syllabuses overlap widely on the fundamentals, but the exam conditions — duration, format, pass mark, validity — vary from one organisation to the next. Check them with the one you are aiming for: beltup does not set them and does not summarise them here, so as not to pass on information that is out of date or foreign to your syllabus.
What beltup covers for this level
997 questions carry the Yellow Belt level, across 19 topics deep enough to fill a whole session.
Every question carries an explanation and the source it comes from.
- Résolution de problèmes
- DMAIC
- Statistiques descriptives
- Indicateurs qualité
- Gaspillages
- Flux
- Takt Time
- Kanban
- Gemba Walk
- Kaizen
- Yamazumi
- Standardisation
- AIC
- Analyse de déroulement
- Maison du Lean
- Management Visuel
- 5S
- SIPOC / VOC
- Fondamentaux Lean
Frequently asked questions
Is there a prerequisite for the Yellow Belt?
No. It is the first level, designed to be accessible with no prior knowledge of Lean and no statistical background. Experience of the field — workshop, service, processing chain — mostly helps in recognising the situations described in the questions.
How long does it take to prepare for a Yellow Belt?
A few weeks of regular revision are enough for most candidates, in short sessions rather than long ones. The limiting factor is rarely the amount to memorise: it is the time it takes for the vocabulary to become a reflex for reading situations.
What is the difference between Yellow Belt and Green Belt?
The Yellow Belt takes part, the Green Belt leads. The first recognises waste and contributes to a project; the second frames a problem, measures, analyses causes with statistical tools and drives implementation. The Green Belt assumes the whole Yellow syllabus is mastered.
Is the Yellow Belt useful outside industry?
Yes, and it is even one of the most widespread uses today: hospitals, banks, insurers, public services, IT teams. The seven wastes transpose directly, inventory becoming the queue and transport the back-and-forth between departments.
Practise at this level
Fifteen Yellow Belt-level questions, marked and explained, with no account and no bank card. The Lean Discovery track then extends the practice, also for free.
The notions to review first
- Fondamentaux du Lean— Le Lean cherche à donner au client ce qu'il valorise en consommant le moins de ressources possible.
- Les sept gaspillages (muda)— Les sept gaspillages classent tout ce qu’un processus consomme sans que le client l’ait demandé : surproduction, attente, transport, sur-traitement, stocks, mouvements et défauts.
- 5S— Les 5S organisent le poste de travail en cinq étapes — trier, ranger, nettoyer, standardiser, pérenniser — pour rendre l’anomalie visible immédiatement.
- Kaizen (amélioration continue)— Le kaizen est l’amélioration continue par petits pas, conduite par ceux qui font le travail, par opposition aux ruptures pilotées depuis l’extérieur.
- Management visuel— Le management visuel rend l'état d'un processus lisible sans avoir à le demander : quiconque entre dans l'espace doit voir en quelques secondes si la situation est normale, et sinon où elle ne l'est pas.
- Gemba (le terrain)— Le gemba désigne le lieu où le travail se fait réellement, et le gemba walk la pratique consistant à s’y rendre pour observer le processus plutôt que d’en lire le compte rendu.
The other levels
Lean Six Sigma Green Belt certification
For an engineer, technician, quality manager, team leader or manager who will lead improvement projects part-time, alongside their job.
Lean Six Sigma Black Belt certification
For an experienced professional who will lead cross-functional projects full-time or most of the time, coach Green Belts and report to senior management.
beltup is an independent practice tool. It awards no certification and is not affiliated with, accredited by or endorsed by any certification body. Trademarks and non-affiliation