Note---Lot-Sizing and Sequencing Delays

In production scheduling, time performance is usually taken to be the province of sequencing models which take task processing times to be given. However, in practice, processing times can often be controlled by the choice of lot sizes which thus have a major impact on makespan, waiting times, flow times and other measures. Here the interface between lot sizing and sequencing is introduced and the effect of lot sizes on makespan and flow times is qualitatively analyzed.