Fuzzy Criteria and Fuzzy Rules in Subjective Evaluation - A General Discussion

This position paper emphasizes the interest of fuzzy set-based methods in subjective evaluation problems, where complex situations, or objects, have to be classified into categories, or have to be assessed under the form of global estimates. More particularly, different types of approaches to these problems, such as multiple-criteria aggregation, rule-based inference, case-based reasoning, are reviewed and put in perspective. Important issues in subjective evaluation, such as the expressibility of an approach with respect to the description of the evaluation process, are pointed out. The paper illustrates this general overview by means of some examples taken from the literature. 1 - SUBJECTIVE EVALUATION A subjective evaluation problem aims at providing a global assessment of a (complex) situation or object. The situation or the object under consideration is supposed to be described in terms of various attributes, and the assessment may be made either in a discrete way by classifying t..