ABSTRACT
Some authors propose to generate an aggregated ranking by applying preference aggregation methods (such as value function based methods) (Keeney & Raiffa 1976). In those cases additional inter-criteria information is required, such as the underlying functional form and the associated parameters and particular characteristics (tradeoff values, for example). This means that intense interactions with the decision makers (DM) are required and, in many real cases, strong assumptions about desirable properties are made (preference independence, for instance (Keeney & Raiffa 1976). Of course, in some cases, a simple unordered linear combination may be used but different DM preferences cannot be considered.
