In this figure, the weighted job-average value of the time in system is plotted against the weighted job-average value of the shop flow time. Superior strategies yield lower time in the system for a given shop flow time, i.e. will have a curve which is shifted down and to the left. A point on curve is the result of simulating a workload control strategy at a specific workload norm level. Note that norms are equally tight if they result in the same shop flow time.