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In this article, the quantified expression of criteria weights in decision-making processes is considered. A decision maker is often able to express his or her preferences only linguistically. The concept of fuzzy numbers, or linguistic variables, is used in order to state these vague preferences. A fuzzy number is considered as one with a triangular membership function, which renders an approximate value of the weight of a particular criterion according to linguistic terms about itsdoi:10.7327/cerei.2014.03.02 fatcat:imbuga3irzeopjt7h5bo2g34kq