Supplier selection for one-sided processes with unequal sample sizes

W.l. Pearn, Hui-Nien Hung, Ya Ching Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


In this paper, we consider the supplier selection problem which deals with comparing two one-sided processes and selecting the one that has a significantly higher capability value. We present an exact approach to tackle the supplier selection problem. Testing hypotheses with two phases for comparing two processes are considered. Critical values of the tests are calculated to determine the selection decisions. Sample size required for a designated selection power and confidence level is also investigated. The results provide useful information to practitioners. The proposed approach generalizes the existing method by not requiring equal sample sizes for the two processes. An application example on comparing two wavelength division multiplexer (WDM) manufacturing processes is presented to illustrate the practicality of our approach to actual data collected from the factories.

Original languageEnglish
Pages (from-to)381-393
Number of pages13
JournalEuropean Journal of Operational Research
Issue number2
StatePublished - 1 Jun 2009


  • Nonconformities
  • Process capability index
  • Supplier selection


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