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The wide acceptance of the Just in Time (JIT) principles and techniques came in the 1980s, after many manufacturing operations had made use of the Material Requirements Planning (MRP)-based systems. Furthermore, the operating philosophies of MRP and JIT do seem to be fundamentally opposed. JIT encourages a “pull’’ system of planning and control, while MRP is a ‘push’ system. JIT has aims which are wider than the operations planning and control activity, while MRP is essentially a planning and control ‘calculation mechanism’. Yet the two approaches can co-exist in the same operation, provided their respective advantages are preserved.
As an operations manager of a manufacturing company:
