Semnan University International Journal of Nonlinear Analysis and Applications 2008-6822 14 7 2023 07 01 Evaluating the function of reverse fund in 'Majma Hamiyari tourism development plan' using fuzzy expert system 45 56 7905 10.22075/ijnaa.2023.29690.4229 EN Abbas Bashiri The CEO of Creative Company, Vice Presidency for Science and Technology, Sari, Iran Seyed Mehdi Mirhosseini-Alizamini Department of Mathematics, Payame Noor University (PNU), Tehran, Iran Mikaeil Janbazi-Ghadi The CEO of Creative Company, Vice Presidency for Science and Technology, Sari, Iran Journal Article 2023 01 21 In this article, ‎according to the competition in marketing science, ‎a method for better decision-making and marketing forecast based on fuzzy logic "‎fuzzy expert system" ‎is presented regarding the tourism development plan of Majma Hamiyari owned by Abbas Bashiri‎. ‎In this research, ‎the evaluation of the system based on the calculation method of the proposed plan (reverse fund) is presented in attracting different layers of the society based on the definition of input variables such as age, ‎education, ‎marital, ‎place of residence, ‎membership in life insurance and membership in the family fund. ‎In fact, ‎the proposed method offers marketing managers a plan that concentrates the most time and financial capital for advertising for a segment of society that this calculation method (reverse fund) has the greatest effect on attracting customers. ‎The fuzzy expert system was designed with 12 rules after reviewing the rules and removing similar and contradictory rules by using their degree calculation. ‎In this system, ‎by integrating some factors, ‎finally, 6 input variables and one output variable were considered that were used by the product inference engine, ‎singleton fuzzifier and center average defuzzifier‎. ‎It was observed that the designed fuzzy expert system provides very good results. https://ijnaa.semnan.ac.ir/article_7905_e60f9aad1372778df3783844c251ae7e.pdf