Islamic Azad University, Qaemshahr BranchFuzzy Optimization and Modeling Journal2676-70071120200401The Reference Ideal Method and the Pythagorean Fuzzy Numbers3241545712ENElioCablesDepto de Ingeniería Informática, Universidad de Holguín "Oscar Lucero Moya", Holguín, CubaMarĂa TeresaLamataUniversity of GranadaJose LuisVerdegayComputer Science and Artificial Intelligence, University of Granada, SpainJournal Article20200505As it is well known, in spite of having small dimensions, there are daily many<br />situations that require the solution of a decision-making problem: eating, streets<br />crossing, assessments, shopping and so on. Generally, the way of working on<br />these types of problems depends on how the information used to evaluate each<br />alternative is provided and represented, as for instance is the case with: crisp <br />values, fuzzy values, Pythagorean values, etc. In this way, different very wellknown<br />methods have been developed and modified to help to solve this kind of<br />problems. Among them, the following may be remarked: AHP, PROMETHEE,<br />ELECTRE, VIKOR, TOPSIS. But there are many other. This paper shows how<br />to apply the so-called Reference Ideal Method (RIM), previously developed by<br />the authors, when Pythagorean Fuzzy numbers are used to evaluate each<br />alternative. The paper shows how to solve a decision-making problem through<br />the proposed method using such kind of fuzzy numbers and, in order to show<br />how to practically apply the RIM method, an illustrative example is provided.http://fomj.qaemiau.ac.ir/article_545712_cd2fb93e884b23554f7c3b9c55e06386.pdf