Job shop production planning and control : case study

Franco, Aharon
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A scheduling approach for job-shop or made-tc-order production has been studied extensively over the last 20 years in connection with computerized systems for Production Planning & Control. The purpose of the major part of this text is to "sell" the idea of a Real Queue approach for ordinary jobs computerized scheduling systems, and a Manual Planning system for emergency and short jobs, by means of capacity allocated to this purpose. Most of the systems employed to-day by various production companies, are "packages" sold to them by large Computerized Data Processing companies and were tailored to suit them, based on the available modular software systems, with no significant differences between one or the other. Whereas, the computer used in production planning improved control over orders, reduced the clerical work concerned and provided quick and efficient tools for decision making, less success was achieved in production management regarding meeting of definite promised delivery dates, as a result of emergency and short jobs entering the system and requiring immediate production processing. This can be attributed to the people using the system, but to a large extent, it is attributable to the approach of scheduling in most cases. Nevertheless, attempts were made to construct suitable programmes, but only by a few companies, employing in-house programmers and systems personnel for their own