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Website Evaluation Using Interval Type-2 Fuzzy-Number-Based TOPSIS Approach

In recent years, with the development of the internet, there has been an increase in interest in the internet thanks to other technological developments. In the face of increased user demand, educational institution websites have to maintain high quality of service for a sustainable success. The authors present the possibility degree based TOPSIS method with IT2F numbers as an extension of TOPSIS method to evaluate the educational institution websites. In contrast to precise numbers in TOPSIS method, the merit of fuzzy TOPSIS method is to handle the fuzzy numbers to evaluate the alternatives. Type-1 fuzzy numbers consider crisp membership degrees to express fuzzy numbers but IT2F numbers handle more uncertainties than type-1 fuzzy numbers. The subjective judgments of the decision makers are aggregated by using the IT2F number operations to determine the weights of these criteria. IT2TrF numbers-based TOPSIS phase is employed to rank alternatives based on criteria so that assessment process is completed. The proposed method is applied to evaluate the educational institution websites.