Case study: Quality improvement model in a car seat assembly line

J. C. Tsou, J. M. Chen

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


In this paper, we develop a quality improvement model based on the structure of classical economic production quantity (EPQ) model. The asymmetrical truncated loss function is used to evaluate the cost of poor quality in a production system. A practical quality improvement case which follows the 6-sigma DMAIC method in a car seat assembly line is discussed to verify the proposed model. Our model provides a fundamental structure for studying the cost of quality improvement in a production system. Based on this model, the management can evaluate the affect of quality investment to generate significant financial return in their production line.

Original languageEnglish
Pages (from-to)681-690
Number of pages10
JournalProduction Planning and Control
Issue number7
StatePublished - Oct 2005


  • 6-sigma
  • Asymmetrical truncated loss function
  • Economics of production


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