Learn in the textbookProduction Management Methods and Systems
DefinitionJIT (just-in-time, ジャストインタイム) is a production method in which each process makes and delivers parts or products to match when and how much the next process uses, keeping inventory between processes to a minimum.
ExplanationIt has been the core idea behind the production systems of Japanese carmakers, and the same thinking is applied to sourcing raw materials and parts. With fewer half-finished items (work in process) and parts sitting between processes, wasted storage space and overproduction shrink. On the other hand, the line tends to stop right away if the parts supply is interrupted.
AnalogyThink of a convenience store shelf restocked several times a day with exactly what sold. The shelf never goes empty, even without a big stockroom in the back.
Memory hookJust In Time is like reaching the platform right as the train leaves. Too early and you become inventory; too late and you have a stockout.