Build story · Japan · 1950s–2023
Toyota Production System: just-in-time and stopping the line
Toyota developed just-in-time production, kanban cards, and the right for any worker to stop the line, producing high-quality cars with little waste. Lean methods spread worldwide.
By Shivam Bhandari · Reviewed 31 October 2026 · How we write
by the numbers
- System developed
- 1950s
- NUMMI joint venture
- 1984
- Vehicles sold (2023)
- over 11 million
What happened
Toyota began as an automatic-loom maker; founder Sakichi Toyoda's looms stopped automatically when a thread broke — an idea called jidoka. After the Second World War, Toyota was small and short of capital and couldn't copy Detroit's mass production.
Engineer Taiichi Ohno developed what became the Toyota Production System in the 1950s. Inspired partly by how American supermarkets restocked shelves, he used kanban cards so each process produced only what the next one needed — just in time — cutting inventory. Any worker could pull an ‘andon’ cord to stop the line when they saw a defect, so problems were fixed at the source. Continuous improvement (kaizen) became part of daily work.
In 1984 Toyota and GM opened NUMMI in Fremont, California, turning one of GM's worst plants into one of its best using Toyota's system. Toyota became the world's largest carmaker by sales, selling over 11 million vehicles in 2023.
Timeline
- 1924
Sakichi Toyoda's automatic loom.
- 1950s
Ohno develops just-in-time and kanban.
- 1984
NUMMI opens with GM.
- 1990
‘The Machine That Changed the World’ popularises lean.
what made it work
- Producing only what's needed cut waste and inventory.
- Empowered workers to stop problems at the source.
- Continuous small improvements by everyone.
the lesson
Respecting workers' ability to spot and fix problems, and producing only what's needed, creates quality and efficiency together.
Apply it to your business
- 1Reduce inventory to expose hidden problems.
- 2Give staff authority to stop and fix defects.
- 3Make small improvements every week.
Laws at work in this story
Figures are rounded and drawn from public reports, company filings and widely cited coverage at the time. Check the company's latest filings before relying on any number.