“…In order to overcome the problem in their methods, by eliminating the fuzzy goals for the decision variables, Sakawa et al have proposed interactive fuzzy programming for two-level or multi-level linear programming problems to obtain a satisfactory solution for DMs [29,30]. The subsequent works on two-level or multi-level programming have been developing [14,26,27,31,32,40,18,1,19,28]. In actual decision making situations, however, we must often make a decision on the basis of vague information or uncertain data.…”