Abstract
Student evaluations of university efficiency are compulsory for universities. The Italian Ministry of University and Scientific and Technological Research proposed a questionnaire with items based on the four-point Likert scale and a traditional item-by-item analysis for the evaluation of teaching staff activity. Three split ballot experiments were carried out to test the differences between the four-point and five-point Likert scale. The traditional analysis was compared with the results of the fuzzy expert system set up to achieve the same purpose. The fuzzy approach offered the possibility of the marking scale to use values more proximate to those that the students really wanted to attribute to them. The rule-blocks set up accounted for links between the inputs and the importance that teachers and students attributed to the single input. The fuzzy expert system yielded scores that proved to be generally higher but sometimes also lower than those obtained using the five/four-point Likert scale.
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