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.