The primary elements of zero inventories synonym to JIT ) are:
a. To have only the required inventory when needed.
b. To improve quality to zero defects.
c. To reduce lead times by reducing set up times queue lengths and lot sizes.
d. To incrementally revise the operations themselves and to accomplish these things at minimum cost.
The concept of JIT is extended to the whole system of production i ,e, :
a. To produce and deliver finished goods just in time to be sold.
b. Sub assemblies just in time to be assembled into finished goods.
c. Purchased materials just in time to be transformed into fabricated parts.
Thus JIT standsfor producing necessary units in necessary quantities at the necessary time. The ultimate aim of JIT is to concentrate on lotless repetitive manufacturing with only one unit of work in process and no stock of finished goods inventories.