“…Fuzzy sets can be applied in several ways in the context of MPC, e.g., at the modeling level (Sousa et ai., 1997;Nakamori, 1994;Pottrnann and Seborg, 1997;Fischer et al, 1997;de Oliveira and Lemos, 1995;Roubos et ai., 1998), in optimization (Lu et ai., 1997, and in the specification of the control objectives (Kaymak et ai., 1997). Since a model of the process is a part of the control scheme, this model can be adapted on-line in order to minimize the difference between the expected and real process outputs.…”