group decision-making based on last aggregation approach under interval-valued pythagorean fuzzy environment for sustainable project decision

Interval-valued pythagorean fuzzy sets (ivpfss) as enhanced type of pythagorean fuzzy sets (pfss) improve the expression of the degrees of membership, non-membership and hesitancy in comparison with intuitionistic fuzzy sets (ifss). in this paper, to use the advantages of ivpfss a new group decision-making method is introduced based on linear assignment method (lam). in this approach, subjective and objective weights of criteria are taken into account. moreover, the method applies a new ranking method for ivpfss. to avoid the shortcomings of first aggregation methods, the introduced decision-making approach involves a last aggregation approach. finally, the method is used in a case study of sustainable project evaluation in order to depict the applicability of this method.