Assessing process performance based on the incapability index C pp

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Process incapability index Cpp has been introduced to the manufacturing industry to measure process performance. But all existing methods for testing Cpp require further estimation of the distribution parameters when calculating the p-values and critical values causing additional sampling errors, which is unreliable. In this paper, an efficient SAS computer program is provided to calculate the p-values. Extensive calculations were performed to examine the behavior of the p-values and the critical values c 0 against the distribution parameter. Useful critical values for commonly used capability requirements are also tabulated. A simple but practical step-by-step hypothesis-testing procedure is developed for in-plant applications.

Original languageEnglish
Pages (from-to)145-158
Number of pages14
JournalInternational Journal of Industrial Engineering : Theory Applications and Practice
Issue number2
StatePublished - 1 Dec 2005


  • Critical value
  • P-value
  • Process incapability index
  • Testing hypothesis

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