A Type-2 fuzzy logic approach for multi-criteria group decision making

Abstract

Multi-Criteria Group Decision Making (MCGDM) is a decision tool which is able to find a unique agreement from a group of decision makers (DMs) by evaluating various conflicting criteria. However, the current multi-criteria decision making with a group of OMs (MCGDM) techniques do not effectively deal with the large number of possibilities that cause disagreement between different judgments and the variety of ideas and opinions among the decision makers which lead to high uncertainty levels. There is a growing interest to investigate techniques to handle the faced uncertainties in many decision making applications. Studies in fuzzy decision making have grown rapidly in the utilisation of extended fuzzy set theories (i.e., Type-2 Fuzzy Sets, Intuitionistic Fuzzy Sets, Hesitant Fuzzy Sets, Vague Sets, Interval-valued Fuzzy Sets, etc.) to evaluate the faced uncertainties.