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The objective of this paper is to conduct a comparative analysis of four popular fuzzy multi-criteria decision-making methods(FMCDMs), namely Fuzzy DEMATEL(FD), Fuzzy TOPSIS(FT), Fuzzy VIKOR(FV), and Fuzzy PROMETHEE(FP), for QoS-based web service selection in the present of the three ranking versions of Fuzzy VIKOR. The study aimed to establish the ranking similarities using the spearman’s relationship figure. To achieve this, the algorithms of the now six FMCDMs are presented in the material and methods section. A Case experiment was performed using primary data from five experts’ ratings of 9 Quality of Service factors of 9 web services. The experimental case analysis was performed using a modified online Output software. The results showed S6 was ranked first position in all the FMCDMs compared with the exception FD and FP where S6 was ranked 2ND and 8th Positions respectively. On the Similarity Measure of the compared FMCDMs, the maximum association coefficient, Rs, was found between the rankings obtained using FT and FV Ranking in S techniques (0.983), FV Ranking in S and FV Ranking in Q (0.883), and FT and FV Ranking Q (0.833). The results of the analysis will be useful for decision-makers and researchers in selecting the most appropriate methods for their specific requirements integrated FMCDM studies and for solving real-world problems. This is study is limited because the experts were drawn from only public universities in the Greater Accra Region of the Republic of Ghana as the source of primary data for this study. Future studies can use secondary data with other MCDMs under Type-3 Fuzzy Environment.

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