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The study reviews recent literature on dispatching rules. The methodology of dispatching rule development is discussed. Included is information needed by someone familiar with GEMS to use the simulator to study the effects various dispatching rules would have on a given shop. The major pitfall in studying dispatching rules is that an improperly designed study will result in biased estimates of various measurement criteria. The methodology for avoiding this bias is discussed. The relative performance of dispatching rules for the purpose of identifying the best dispatching rules for inclusion in GEMS is discussed. Nine rules have been recommended for inclusion. One of these rules, the shortest imminent operation rule, has been identified as the best rule given certain specified conditions. When none of these conditions obtain, it is not clear which of the other eight rules is best. Part of the GEMS modeling philosophy is the inclusion of dispatching rules which may be accessed by the user directly. The nine rules identified by this study are to be included as part of the GEMS system in the near future. (DePo)