He studied Mathematics at the University of Bologna and, in the past years, he worked on fuzzy sets, neural networks and their application in Economics. His actual research interests are on preference modelling, pairwise comparisons, inconsistency evaluation, incomplete preference relations, Analytic Hierarchy Process, consensual dynamics models in group decisions. The main achievements are on: (1) transformations between multiplicative and additive representation of valued preference relations, (2) axiomatic characterization of inconsistency indices, (3) the use of norm–based distances in inconsistency evaluation and in obtaining the weight vector from a pairwise comparison matrix. His research cooperation includes: Wroclaw University of Economics, Berkeley University, Aalto University, Portsmouth University, Palacký University in Olomouc.