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Hidden quality defects and work-in-process inventory

Author: Cordon, Carlos INSEAD Area: Technology and Operations ManagementPublisher: Fontainebleau : INSEAD, 1995.Language: EnglishDescription: 123 p. ; 31 cm.Type of document: INSEAD ThesisThesis Note: For the degree of Ph.D. in management, INSEAD, June 1995Bibliography/Index: Includes bibliographical referencesAbstract: The objectives of this thesis are to analyse the effects of hidden quality defects on lead time and to study the performance of policies to offset the negative impact of these effects. This thesis is (1) the first formal analysis of this phenomenon and (2) one of the first studies to formally show a negative effect of WIP, in addition to inventory holding costs. The thesis begins with a study of the congestion caused by hidden quality defects. The major theoretical result is that these effects can be so significant as to cause the work-in-process (WIP) inventory to grow without bounds. Failures provoke total congestion. We study the transient evolution of the system through analytical approximations and simulations. The expected rate of WIP build-up increases substantially when the system reaches a critical level of WIP. We conclude by analysing the performance of policies to avoid total congestion. We find that the situation studied, decreasing WIP buffers can increase the expected throughput
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For the degree of Ph.D. in management, INSEAD, June 1995

Includes bibliographical references

The objectives of this thesis are to analyse the effects of hidden quality defects on lead time and to study the performance of policies to offset the negative impact of these effects. This thesis is (1) the first formal analysis of this phenomenon and (2) one of the first studies to formally show a negative effect of WIP, in addition to inventory holding costs. The thesis begins with a study of the congestion caused by hidden quality defects. The major theoretical result is that these effects can be so significant as to cause the work-in-process (WIP) inventory to grow without bounds. Failures provoke total congestion. We study the transient evolution of the system through analytical approximations and simulations. The expected rate of WIP build-up increases substantially when the system reaches a critical level of WIP. We conclude by analysing the performance of policies to avoid total congestion. We find that the situation studied, decreasing WIP buffers can increase the expected throughput

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