The purpose of this paper is to present a structural approach appropriate for the processes with multiple evaluations, and, more generally, to processes with evolutive sets of evaluations. The key point is that humans naturally aggregate partial evaluations in order to achieve structural stability. To avoid undecidability or ambiguity generated by conflict, they seem to ‘pull back’ at a higher level of synthesis, towards the initial elemen t of the structure which describes the evaluation process. This paper is dedicated to all those who wonder about the use of a theory of fuzzy systems.