From JIT to Lean Manufacturing

The History of Just in Time

Around 1980 we were all just getting used to the concepts of Material Requirements Planning (MRP) and Manufacturing Resource Planning (MRPII) with their dependence on complex computer packages when we began to hear of manufacturers in Japan carrying no stock and giving 100% customer service without any of this MRP sophistication.

Japanese car manufacturers ensured that every steering column was assembled and fed onto a production line just as the car into which it was to be fitted rolled up at that particular stage. This was all managed by something called a kanban which meant «tag» and was the mechanism by which the assembly line told the feeder areas that they wanted another component. The first visitors to Japan came back to tell us that the kanban replaced MRP and was the key to Japanese success.

In time, we learned that the kanban was the last improvement step of many, not the first. The conceptual goals of minimised lead times and inventories rated above all else. The Japanese aim was having everything only when required and only in the quantity required – in other words, just-in-time (JIT).

We then learned that Toyota led the way in the development of the Japanese approach. We heard of something called the Toyota Production System which was the model for all that had happened in Japanese manufacturing. We heard of Taiichi Ohno, the production engineer responsible for this breakthrough.

The list below highlights what our Japanese counterparts had done.

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