Just in time production is defined as philosophy that focuses attention on eliminating waste by purchasing or manufacturing just enough of the right items just in time
It is a Japanese management philosophy applied in manufacturing which involves having the right items of the right quality and quantity in the right place and at the right time.
Some observers have called JIT hand to mouth approach to production. It aims at having the right part at precise right time and in the right quantity to go into assembly.
According to APICS ( American Production and Inventory Control Society .) J IT is a philosophy of manufacturing based on planned elimination of all waste and continuous improvement of productivity. It encompasses the successful execution of all manufacturing activities required to produce a final product from engineering to delivery and including all stages of conversion from raw materials onwards.