FundamentalsJust-in-Time

What is Just-in-Time (JIT)?

Just-in-Time is the principle of producing and delivering exactly what is needed, in the quantity needed, at the time it is needed. JIT is one of the two pillars of the Toyota Production System (the other is jidoka).

JIT minimises inventory and lead time, but at the same time makes the chain sensitive to disruptions — there are no buffer stocks to draw on. That is why JIT presupposes stable processes, reliable suppliers and short changeover times.

After the supply crises of the 2020s, many companies balance JIT with strategic buffers on critical components — the principle is not “zero inventory”, but “deliberate inventory”.

Related concepts

The pull principle

Pull means nothing is produced until the next link in the chain demands it — in contrast to push, where production follows a forecast and is pushed onward. Pull limits overproduction and inventory, because consumption controls production.

Kanban

Kanban is a signalling system that controls production and replenishment based on actual consumption: a card, an empty space or an electronic signal grants permission to produce or deliver a fixed quantity. Kanban is the practical mechanics behind the pull principle.

Flow

Flow means an item or a case moves through the process without stops, accumulation or waiting. Perfect flow is one-piece production: each item is processed and passed on immediately.

Jidoka

Jidoka — often translated “automation with a human touch” — is the principle that processes stop themselves at deviations, so defects are never passed on. Jidoka is the second pillar of the Toyota Production System alongside Just-in-Time.

From concept to practice

The methods only work when they are anchored in daily routines and leadership behaviour. The operations check shows in 4 minutes where your operations stand — and what the next step is.

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