Abstract: Relative importance or weight of criterion indicates the priority assigned to the criterion by the decision-maker while ranking the alternatives in a multicriterion decision-making (MCDM) environment. Multicriterion decision making (MCDM) has emerged as an effective methodology due to its ability to combine quantitative and qualitative criteria selection of the best alternative. Concurrently, fuzzy logic is gaining importance due to its flexibility in handling imprecise subjective data. In the present study two fuzzy logic-based MCDM methods, namely similarity analysis (SA) and decision analysis (DA), are adopted and developed as a fuzzy decision system (FUDS) and applied to a case study of the Aringar Anna Sugar Project (AASP), Tamil nadu, India, for selecting the best-performing irrigation subsystem. It is found that both SA and DA suggested the same irrigation subsystem as the best. It is concluded that application of fuzzy logic methodology for real-world decision-making problems is found to be effective.