Soltanifar, M.Sharafi, H.Hosseinzadeh Lotfi, F.Pedrycz, W.Allahviranloo, T.2024-05-192024-05-1920232198-4182https://doi.org/10.1007/978-3-031-30403-3_1https://hdl.handle.net/20.500.12713/4453The problem of “election” using the aggregation of voters’ votes is one of the most important problems of group decision-making for which several models have been presented so far. Consider a group of people who need to make a group decision based on voters’ votes. Given that people have different opinions and tastes, how can they make a decision that includes all individual opinions? From such a simple issue to the choice of politicians, all of them require a collective decision. In this chapter, this concept and methods of aggregating individual votes to reach a collective decision are discussed. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.eninfo:eu-repo/semantics/closedAccessBook Chapter4711102-s2.0-8515995981610.1007/978-3-031-30403-3_1Q4