The fuzzy behaviour of preference tries to introduce indivi- duals whose preferences are not necessarily clear or coher- ent. The agents who have imprecise preferences are much more shaded. On the contrary of Boolean agents, fuzzy agents can- not decide anything with their only preferences....

Fuzzy set theory has been explicitly introduced to deal with vagueness and ambiguity. One can also use probability theory or techniques borrowed from philosophical logic. In this chapter, we consider fuzzy preferences and we survey the literature on aggregation of fuzzy preferences. We restrict...