The paper aims to provide a framework for the preliminary design of dial a ride system. In this context we have carried out a stated preference survey to evaluate the potential
demand of service, taking into account a sample of citizens with limited disability to move.
Thus, we have submitted a questionnaire to users of some clinics of Palermo, considering in
the choice competitive scenario the dial a ride system. Furthermore a multinomial logit model
has been calibrated. Finally a preliminary design of service has been proposed