Hosseinzadeh Lotfi, F.Allahviranloo, T.Pedrycz, W.Shahriari, M.Sharafi, H.Razipour, GhalehJough, S.2024-05-192024-05-1920231860-949Xhttps://doi.org/10.1007/978-3-031-44742-6_12https://hdl.handle.net/20.500.12713/4475In this chapter, the algorithm of COmplex PRoportional ASsessment (COPRAS) method with crisp data is explained and then it is applied to select among varied smart phones considering five different attributes. Afterward, Fuzzy COPRAS method is explained in detail. To choose the best investment, Fuzzy COPRAS method has been used, taking into account the conflicting criteria and according to a group of the experts’ opinion. Fuzzy COPRAS provides valuable tools for addressing multi-criteria decision-making challenges and fuzzy decision-making scenarios. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.eninfo:eu-repo/semantics/closedAccessBook Chapter11212913082-s2.0-8518470901210.1007/978-3-031-44742-6_12N/A