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 an enhanced type of Pythagorean Fuzzy Sets (PFSs) improve the expression of membership, non-membership, and hesitancy degrees, compared to Intuitionistic Fuzzy Sets (IFSs). In order to benefit from the advantages of IVPFSs, the current research proposes a new group decisionmaking method based on Linear Assignment Method (LAM). In this approach, both subjective and objective weights of criteria were taken into account. Moreover, the proposed method applied a new ranking method for IVPFSs. To avoid the shortcomings of the first aggregation methods, the introduced decision-making approach focused on the last aggregation approach. Finally, the method was used in a case study of sustainable project evaluation in order to depict the applicability of this method.