In the field of chemical engineering and large-scale economic planning the classical approaches of single-objective thinking with an economic efficiency criterion only have shown to be inadequate for several reasons (Grauer, Lewandowski and Wierzbicki, 1983). The increasing awareness of the finiteness of natural resources and of the urgent necessity to protect the environment from hazardous emissions led to the requirement to consider in decision problems as well as economic efficiency and also resources and energy conservation and environmental protection criteria.