Workload balancing capability of pull systems in MTO production

Abstract

Abstract\n Pull systems focusing on throughput time control and applicable in situations with high variety and customisation are scarce. This paper compares three unit-based pull systems that can cope with such situations: POLCA, CONWIP and m-CONWIP. These systems control the shop floor throughput time of orders by limiting the number of orders on the shop floor. However, their effectiveness in terms of reducing total throughput time is questioned. Theory states that an improvement of the average total throughput time will be due to the workload balancing capability of a pull system, but that many pull systems lack this capability. This paper shows this workload balancing capability to exist for POLCA and m-CONWIP, but not for CONWIP. The magnitude of the effect strongly differs, depending on the configuration of the system, the order arrival pattern and the variability of the processing time of the orders.