Abstract
Previous authors have shown that dynamic ratio scheduling rules do not always behave as intended. A recent proposal by Adam and Surkis (Adam, N. R., J. Surkis. 1980. Priority update intervals and anomalies in dynamic ratio type job shop scheduling rules. Management Sci. 26 (12, December) 1227–1237.) to correct such anomalies is shown to be in error. The reason why such anomalies occur is clarified and a rule which prevents such anomalies is presented.
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