A Decision-Making Approach to Selecting Supplier Based on the Quality Evaluation of Process  
Author Kuen-Suan Chen


Co-Author(s) Chiao-Tzu Huang; Tsang-Chuan Chang


Abstract Supplier selection is a practical problem that challenges supply chain management in a variety of industries. Quality is the most critical criterion in selecting a supplier; therefore, in this study, we developed a supplier selection model based on process quality. In so doing, we employed the Six Sigma quality index Qpk as a tool to assess the process quality provided by suppliers. However, basing index estimation on the collection of sample data introduces uncertainty into the assessment of process quality. Therefore, to reduce the likelihood of assessment miscalculations, we derived the confidence interval of Qpk via mathematical programming and then used this interval to perform a pairwise comparison of suppliers. Our goal was to identify criteria that can be used to select the optimal suppliers for long-term collaboration and sustainable partnerships. A case study is also presented to demonstrate the practical implementation of the proposed method.


Keywords Supplier selection, Process quality, Six Sigma quality index, Confidence interval, Pairwise comparison
    Article #:  RQD25-83
Proceedings of 25th ISSAT International Conference on Reliability & Quality in Design
August 1-3, 2019 - Las Vegas, NV, U.S.A.