Since the referee irreplace si configure like one tool negotiating of resolution of the disputes, centered on the custody a third of the task of search a composition friendly of the controversy, the relative praise is challengeable e Excluded per vices of the will (willful misconduct, violence or error) o per inability of the parts or of the referees e, therefore, without being able to deduce the error in iudicando i.e. the (complained) erroneous interpretation of the contract object of the arbitration.