Abstract
Olhager and Rapp's (1985) lot size model is one among several contemporary attempts to capture the effect of lot sizes on manufacturing queuing time and work-in-progress. The model has been widely published (Olhager and Rapp, 1982, 1984, 1988, 1991; Olhager, 1988, 1989). An uncritical reference to the model was recently made by Bertrand et al. (1990, p. 104). The continuous interest makes it necessary to scrutinize the scientific standard of the model. The present comments point at major difficulties and ambiguities in Olhager and Rapp's model. It seems that all conclusions based on it must be either dismissed or reevaluated. Correct approximative models with a scope similar to Olhager and Rapp's have been developed by, e.g. Axsäter (1981), Zipkin (1986) and Karmarkar (1987).
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