Nowdays, an increasing trend in industrial companies is to conduct outsourcing for those products and activities considered to be outside the company's core business. Because of the financial importance and the multi-objective nature of supplier selection decision, in this paper we make an effort to highlight those crucial aspects to process qualitative and quantitative performance measures. In this paper, we use a multi-criteria decision aid method (PROMETHEE) to solve such problems, and then perform a sensitivity analysis to analyze simultaneous change of the weights importance of performance criteria. The whole suppliers selection model presented here (PROMETHEE techniques plus sensitivity analysis) seems to be a useful tool inside the final decision phase of a supplier selection process.
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