Ivanosca A. Da Silva,  Benjamín Bedregal,  Regivan H. N. Santiago,  Adrião D. Dória Neto. 

In this paper we provide an extension of weighted average operator for interval-valued intuitionistic degrees and apply it as part of adaptation of weighted voting strategy in order to develop a new method for interval-valued intuitionistic fuzzy group decision making. In order to rank alternatives we use total order introduced by Xu and Yager for interval-valued intuitionistic degrees. A characteristic of this proposed method is that it works with interval-valued intuitionistic fuzzy values in all moments and therefore considers the uncertainty on the membership and non-membership in all steps of decision making. The method provide good results and compared with other approaches it is very simple.

http://www.lbd.dcc.ufmg.br/colecoes/cbsf/2012/0022.pdf

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