Supplier selection with the approach of combining Fuzzy Delphi Analytic Hierarchy Process (FDAHP) and Grey VIKOR methods

The supplier selection is one of the most important issues in supply chain management discipline and it is regarded as an effective factor for companies to survive in the competitive environment. Selecting the best supplier among various suppliers, considering a mixture of criteria that are sometimes in conflict, makes it a complicated multi-criteria decision making problem. On the other hand, supplier selection is highly dependent on the assessments of decision makers and according to the environmental dynamics and incomplete information available to decision makers, they are faced with some uncertainty in their assessments. The purpose of this paper is to present a model of multi-criteria decision making under uncertainty by using concepts of fuzzy and grey theories in order to select the optimal supplier. In this research, first, the weights of supplier selection criteria are determined by using fuzzy Delphi and analytic hierarchy process, then suppliers are ranked by using Grey VIKOR which is a newly developed approach in the field of multi-criteria decision making under uncertainty.