In multiperson decision analysis there are two basic types of decision situation. One is the case of collegial decisions, where the nature or an institutional mechanism of decisions implies that only cooperative decisions are considered (such as in collegial discussions about joint budget allocation). Multiobjective decision analysis, cooperative game and bargaining theory have provided many tools for this case and several types of decision support systems have been already developed, see e.g. (Lewandowski and Wierzbicki, 1987; Bronisz, Krus and Lopuch, 1987). The other is the case of individual multiperson decisions where there is no institutional mechanism forcing the decision makers to make cooperative decisions, each of them can make individual decisions.