Interval Type-2 Fuzzy Set Extension of DEMATEL Method

The purpose of this study was to extend the DEMATEL (Decision-Making Trail and Evaluation Laboratory) method based on the interval type-2 fuzzy sets to obtain the weights of criteria based on words. Generally most decision making methods consider the independency between criteria. DEMATEL method considers the inter-relations between criteria. Some decision making methods use words as the enabler of the decision making. These methods consider the perceptions of decision makers, the uncertainty assigned to each word and map the words into interval type-2 fuzzy sets (IT2 FSs). Therefore we extended the DEMATEL method to obtain the weights that can be used in decision making. The application of this method was proposed for six criteria.