The Just-in-Time (JIT) manufacturing and inventory system is a philosophy that strives to eliminate wastes and be effective in lowering production costs. Inventory is supplied only when needed from start to finish. JIT requires the total cooperation of the entire company from the top executives to the common factory worker. Suppliers must also be included in the system to ensure that materials are shipped exactly when needed. Only when this is accomplished can a company successfully execute JIT inventory principles.