Abstract
Analytic Hierarchy Process (AHP) is one of the most popular tools for supporting human decision making, and several fuzzy extensions of AHP have been proposed. The present paper discusses psychological effects of both fuzzy rating and crisp feedback of the results in fuzzy AHP. Fuzzy rating in fuzzy AHP could incorporate the fuzziness of a person's feelings in his/her decision making. Crisp feedback, which exaggerates the superiority of only one alternative or the differences among the alternatives, could help a person make his/her decision, especially when being deeply puzzled about his/her choice. The paper suggests that using both fuzzification and defuzzification in fuzzy AHP is very important for supporting human decision making.
