Note--A Note on "Critical Ratio Scheduling: An Experimental Analysis"

Stephen C. Graves
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Stephen C. Graves: University of Rochester

Management Science, 1977, vol. 23, issue 12, 1358-1359

Abstract: A recent journal article [Berry, W. L., Rao, V. 1975. Critical ratio scheduling: an experimental analysis. Management Sci. 22 (2, October) 192-201.] by Berry and Rao on job shop scheduling reported some counterintuitive results concerning the use of dynamic operating information in making priority scheduling decisions. The results of the article, based on a simulation experiment, indicate that dynamic information on queue waiting time at individual machines and on the inventory status of individual items fails to improve the performance of the production system. In fact, the reported performance of the dynamic rule was inferior to the static rules in five out of six cases. The purpose of this note is to call attention to the possibility that it is Berry and Rao's construction and/or use of this information, and not the value of the information itself, which is in question.

Date: 1977
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