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The TOPSIS method for decision making with 2-tuple linguistic intuitionistic fuzzy sets

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This paper develops a new TOPSIS method for multi-criteria group decision-making problems in a 2-tuple linguistic intuitionistic fuzzy environment where every decision maker provides the positive and negative fuzzy linguistic evaluation values of alternatives to express uncertain information in decision making. In such group decision making problems, the weights of decision makers are determined by using the TOPSIS technique. The individual decision of decision makers are then transformed into the group decision of alternatives, and the preference order of
alternatives is given by the TOPSIS. Comparison of proposed method with triangular fuzzy numbers method in the same example is also done to illustrate validity and feasibility of our method.