The complementary nature of manufacturing goals by their relationship to throughput time: A theory of internal variability of production systems

This study argues that major manufacturing goals are compatible due to their relationships with internal throughput time which, in turn, depends upon estimated parameters. Further, this study argues that a large percentage of the internal throughput time is caused by variable move, queue, or preventive maintenance policies that introduce uncertainty into the manufacturing system, requiring internal buffer inventories to accumulate in the queue and increase throughput time. The increase in throughput time decreases production performance by creating higher inventories and lower productivity and a general decrease in the manufacturing performance.