An Experimental Investigation of Priority Assignment in a Job Shop

by Richard Walter Conway

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A study of priority disciplines in a queueing network model for a simplified job-shop process, which, in turn, is relevant for any situation having a set of different facilities and a sequence of tasks consecutively requiring the services of one or more of these facilities. The investigation employs Monte Carlo simulation on a digital computer to compare and evaluate a large number of priority disciplines. Both performance measures of inventory are considered: (1) number of jobs in the system and their work-content; (2) measures of individual job progress — time in shop and lateness against assigned due-date. The study principally concerns a discipline in which, at each point of decision, the available job with the shortest processing time is chosen.

This report is part of the RAND Corporation research memorandum series. The Research Memorandum was a product of the RAND Corporation from 1948 to 1973 that represented working papers meant to report current results of RAND research to appropriate audiences.

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