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Abstract
This paper addresses the issue of which performance time measure, flow or queue time, should be used to evaluate heuristics such as dispatching and labor assignment rules in both machine-limited and dual-resource-constrained production systems. Since the difference between the mean flow time and the mean queue time is simply the mean processing time, any reporting of differences in these means would be uninteresting. Therefore, this research focuses on the variances of these performance time measures. Using these measures, differences between machine-limited and dual-resource-constrained systems are also examined. The methodology employed to conduct this experimentation is computer simulation.
The results indicate that there are major differences in the performance of machine-limited compared to dual-resource-constrained systems. Arguments for using queue time instead of flow time as a performance criterion are supported by the results of additional experimentation. These results have important implications for the interpretation of much of the existing and future research into dispatching and labor assignment rules.
Notes
Handled by the Scheduling/ Planning/Control Department
