If you’ve ever studied manufacturing, it’s likely you will have heard of Just-In-Time production methods. The technique of arranging regular, small deliveries of exactly the correct amount required was pioneered by Toyota.
Just-In-Time (JIT): A ‘pull’ system of providing the different processes in the assembly sequence with only the kinds and quantities of items that they need and only when it needs them. Production and transport take place simultaneously throughout the production sequence — inside and between all the processes.
The primary objectives of JIT are to save warehouse space and unnecessary cost-carrying and to improve efficiency, which means organising the delivery of component parts to individual work stations just before they are physically required. To apply this flow efficiently means relying on ordering signals from Kanban boards or by forecasting parts usage ahead of time, though this latter method requires production numbers to remain stable.
Use of JIT within the Toyota Production System means that individual cars can be built to order and that every component has to fit perfectly first time because there are no alternatives available. It is therefore impossible to hide pre-existing manufacturing issues; they have to be addressed immediately.