Testing manufacturing performance based on capability index Cpm

P. C. Lin*, W.l. Pearn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The loss-based process capability index Cpm, sometimes called the Taguchi index, has been proposed to the manufacturing industry to measure process performance. In this paper, we propose a method to assess the performance of a normally distributed process. We implement the theory of testing hypothesis using the natural estimator of Cpm, and provide an efficient program to calculate the p-values. We also provide tables of the critical values for some commonly used capability requirements. Based on the test, we develop a simple step-by-step procedure for in-plant applications.

Original languageEnglish
Pages (from-to)351-358
Number of pages8
JournalInternational Journal of Advanced Manufacturing Technology
Issue number3-4
StatePublished - 1 Dec 2005


  • Process capability index
  • Taguchi index
  • Testing hypothesis
  • p-value

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