In many hight-tech manufacturing enterprises, the just-in-time(JIT) philosophy has been adopted widely in their production system to minimize the level of inventory. Prior to making any comments on the pros and cons of the application of JIT theory in manufacturing situation, it should be defined clearly. The American Production and Inventory Control Society(APICS) defines JIT as “In broad sense, an approach to achieving excellence in a manufacture company based on the continuing elimination of waste (waste being considered as those things which do not add value to the product). In the narrow sense, JIT refers to the movement of material at the necessary place at the necessary time. The implication is that each operation is closely synchronized with the subsequent ones to make that possible”.