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A Comparison of Strategies to Dampen Nervousness in MRP Systems

A Comparison of Strategies to Dampen Nervousness in MRP Systems This research examines the effectiveness of alternative strategies for dealing with the problem of order instability, or nervousness, which occurs in Material Requirements Planning systems. Nervousness can be particularly disruptive in multi-level production processes where a change in order size or timing at one level can result in changes at other levels.This study proposes and evaluates five different strategies for treating nervousness caused by the interaction of lot-sizing decisions and the planning horizon. Not evaluated here are the effects on order instability caused by demand uncertainty or supply and lead-time uncertainty. The five strategies examined are: (1) Freezing the schedule within the planning horizon, (2) Lot-for-Lot after stage 1, (3) Safety stocks, (4) Forecast beyond the planning horizon, and (5) Change cost procedure.A series of simulation experiments was conducted to test the effectiveness of the five strategies on schedule stability and system costs. The experiments were constructed to evaluate the impacts of various lot-sizing methods, the length of the planning horizon, setup and holding cost parameters and product assembly structure.The results indicate that when the source of nervousness is due to changes in decisions caused by a rolling planning horizon, safety stock and lot-for-lot approaches are not cost effective. Under most conditions, the strategies of incorporating a change cost to discourage schedule changes or freezing the schedule within the planning horizon appear to be dominant. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Management Science INFORMS

A Comparison of Strategies to Dampen Nervousness in MRP Systems

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Publisher
INFORMS
Copyright
Copyright © INFORMS
Subject
Research Article
ISSN
0025-1909
eISSN
1526-5501
DOI
10.1287/mnsc.32.4.413
Publisher site
See Article on Publisher Site

Abstract

This research examines the effectiveness of alternative strategies for dealing with the problem of order instability, or nervousness, which occurs in Material Requirements Planning systems. Nervousness can be particularly disruptive in multi-level production processes where a change in order size or timing at one level can result in changes at other levels.This study proposes and evaluates five different strategies for treating nervousness caused by the interaction of lot-sizing decisions and the planning horizon. Not evaluated here are the effects on order instability caused by demand uncertainty or supply and lead-time uncertainty. The five strategies examined are: (1) Freezing the schedule within the planning horizon, (2) Lot-for-Lot after stage 1, (3) Safety stocks, (4) Forecast beyond the planning horizon, and (5) Change cost procedure.A series of simulation experiments was conducted to test the effectiveness of the five strategies on schedule stability and system costs. The experiments were constructed to evaluate the impacts of various lot-sizing methods, the length of the planning horizon, setup and holding cost parameters and product assembly structure.The results indicate that when the source of nervousness is due to changes in decisions caused by a rolling planning horizon, safety stock and lot-for-lot approaches are not cost effective. Under most conditions, the strategies of incorporating a change cost to discourage schedule changes or freezing the schedule within the planning horizon appear to be dominant.

Journal

Management Science – INFORMS

Published: Apr 1, 1986

Keywords: Keywords : inventory/production: operating characteristics ; inventory/production: simulation ; inventory/production: planning horizons

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