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Lean Manufacturing Japanese Terms Glossary

Lean vocabulary can sound like jargon on a first workshop. This glossary lists the Japanese and Toyota Production System terms you will meet most often, with a plain meaning and where each is used. Search it, print it for the team, or export it to Excel.

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Term	Literal sense	Meaning in lean	Used in
Andon	Lamp or signal	A visual or audible signal that shows a problem so help arrives and the line can be stopped if needed.	Jidoka, shop floor
Gemba	The actual place	Where the work is done and value is created. Managers go to the gemba to see facts.	Management practice
Genchi genbutsu	Go and see	Go to the source and observe the real thing before deciding.	Problem solving
Hansei	Reflection	Honest reflection on what went wrong and what to improve next.	Kaizen, learning
Heijunka	Leveling	Leveling production by volume and mix so work flows evenly instead of in batches and peaks.	Scheduling
Hoshin kanri	Policy deployment	A method to align company goals with daily improvement activity at every level.	Strategy
Jidoka	Automation with a human touch	Build quality in by stopping automatically when an abnormality occurs.	Quality, TPS pillar
Just-in-time (JIT)	In English	Produce and deliver only what is needed, when it is needed, in the quantity needed.	TPS pillar
Kaikaku	Radical change	A fast, large step change in a process, as opposed to incremental kaizen.	Improvement
Kaizen	Change for the better	Continuous improvement by everyone, in small steps, every day.	Improvement
Kanban	Signboard or card	A signal that triggers replenishment or production in a pull system.	Pull systems
Mizusumashi	Water spider	A material handler who feeds lines on a fixed route and schedule.	Logistics
Muda	Waste	Any activity that consumes resources without adding customer value.	Waste elimination
Mura	Unevenness	Variation in workload or flow that creates peaks and idle time.	Waste elimination
Muri	Overburden	Unreasonable strain on people or equipment.	Waste elimination
Nemawashi	Preparing the roots	Building agreement informally before a formal decision.	Change management
Obeya	Big room	A room where project or production information is displayed and reviewed by the team.	Visual management
Poka-yoke	Mistake proofing	A device or method that prevents an error or makes it immediately obvious.	Quality
Seiri	Sort	First S of 5S. Remove what is not needed from the work area.	5S
Seiton	Set in order	Second S. A place for everything and everything in its place.	5S
Seiso	Shine	Third S. Clean the area and inspect while cleaning.	5S
Seiketsu	Standardize	Fourth S. Make the first three S's the standard.	5S
Shitsuke	Sustain	Fifth S. Discipline to maintain the standards as a habit.	5S
Shojinka	Flexible workforce	Adjusting the number of operators to match demand through cross training and cell design.	Staffing
Takt time	Beat or rhythm (German origin)	Available production time divided by customer demand. The pace the customer sets.	Flow
Yokoten	Across everywhere	Sharing a successful improvement horizontally to other areas.	Standardization

Takt is a German word adopted into the Toyota Production System. Literal senses are simplified for readability.

Map lean terms to your ERP

Optional: a short walk through where kanban, takt and andon signals live in your ERP and MES.

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How to use the glossary

Type a term or keyword to filter. Use the Used in column to group terms by theme, for example 5S, pull systems or quality. Export the PDF as a one-page handout for the start of a kaizen event, so that everyone uses the same words. It is more effective to teach five terms that the team will use that week than to hand over a long vocabulary list on day one.

Terms that are easily confused

Kaizen is small and continuous, while kaikaku is a radical change; both are needed. Jidoka is about stopping to prevent defects, while poka-yoke is about preventing the error from happening. Just-in-time and jidoka are the two pillars of the Toyota Production System house. Kanban is a signal and not a schedule: a card does not say when to make, only that stock has been consumed.

Kaizen: continuous, daily, everyone.
Kaikaku: radical, project based, led by management.
Heijunka levels the schedule; takt sets the pace.

Terms in an ERP context

Several terms map onto ERP functions. Kanban cards correspond to replenishment signals such as kanban control cycles or supermarket pull lists. Heijunka is reflected in leveled master scheduling and production versions. Takt time sets rate based planning and line capacity. Andon events can be logged as downtime reasons in MES. Knowing the mapping helps a lean team and an ERP team talk to each other.

Common mistakes

The usual error is using the vocabulary as decoration without changing how work is done. Another is translating terms inconsistently: pick one meaning and use it across the site. Be careful with 5S in particular, where Sort, Set in order, Shine, Standardize and Sustain are English approximations of the Japanese words and different sites use slightly different wording.

Frequently Asked Questions

What does gemba mean?

Gemba means the actual place where work happens and value is created, such as the shop floor. In lean, managers are expected to go to the gemba to observe and talk to people rather than rely only on reports.

What is the difference between jidoka and poka-yoke?

Jidoka means building quality into the process by stopping the machine or line when an abnormality is detected. Poka-yoke is a mistake proofing device or method that prevents an error or makes it immediately visible. Poka-yoke is often one way to achieve jidoka.

What is takt time?

Takt time is the available production time divided by customer demand for the same period. It sets the pace at which you must complete a unit to meet demand. It is a target based on the customer, not the measured cycle time of the process.

Is heijunka the same as scheduling?

No. Heijunka is leveling production by both volume and product mix over time to remove peaks. It uses scheduling tools, but the idea is to smooth demand into a repeating pattern so that people and equipment are not overburdened.

If you want lean signals such as kanban status, downtime reasons and leveled schedules visible in plain language from your ERP, we can discuss an on-prem natural language layer over your existing data.

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