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Effects of Setup and Processing Time Reductions on WIP in the JIT Production Systems

Author

Listed:
  • Subhashish Samaddar

    (Department of Information Management & Decision Sciences, Western Illinois University, College of Business & Technology, Macomb, Illinois 61455)

  • Tej Kaul

    (Department of Information Management & Decision Sciences, Western Illinois University, College of Business & Technology, Macomb, Illinois 61455)

Abstract

Sarkar and Zangwill (S-Z, [Sarkar, D., W. I. Zangwill. 1991. Variance effects in cyclic production systems. Management Sci. 37(4, April) 444--453.]) have shown that in the presence of variance, setup and processing time reductions can have "detrimental" effects on the work-in-process (WIP) inventory in both push and pull (JIT) systems. In this note, we point out that the merits of such a warning for JIT production systems are questionable. If we treat a setup as a PERT network, it is difficult to accept S-Z claim that waiting queues can grow without bound when setup time is reduced. Furthermore, we show that the amount of setup cut, in addition to the level of variance, can determine whether waiting time grows or not. This finding can help in planning a viable setup reduction project. Additionally, we use S-Z example to show that, even when the variances are not reduced proportionately, the expected waiting time does not necessarily increase.

Suggested Citation

  • Subhashish Samaddar & Tej Kaul, 1995. "Effects of Setup and Processing Time Reductions on WIP in the JIT Production Systems," Management Science, INFORMS, vol. 41(7), pages 1263-1265, July.
    • Handle: RePEc:inm:ormnsc:v:41:y:1995:i:7:p:1263-1265
    DOI: 10.1287/mnsc.41.7.1263
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    Cited by:

    1. Robert B. Cooper & Shun-Chen Niu & Mandyam M. Srinivasan, 1998. "When Does Forced Idle Time Improve Performance in Polling Models?," Management Science, INFORMS, vol. 44(8), pages 1079-1086, August.
    2. Subhashish Samaddar & Thomas Whalen, 2008. "Improving Performance in Cyclic Production Systems by Using Forced Variable Idle Setup Time," Manufacturing & Service Operations Management, INFORMS, vol. 10(2), pages 173-180, August.

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