“…Constraints can either take the form of bounds on single weights or link several weights. This kind of information on weights has been considered in the fields of decision making under incomplete information (Franke, 1978;Hannan, 1981;Kirkwood/Sarin, 1985;Hazen, 1986;Weber, 1987;Arbel, 1989;Malakooti, 1989) and sensitivity analysis (Evans, 1984;Schneller/Sphicas, 1985;Vetschera, 1986;Barron/Schmidt, 1988;Rios Insua/French, 1991). The motivation for that kind of analysis was the problem of a decision maker who is uncertain about his preferences and consequently not able to specify the weights precisely, but prefers to provide only interval or ordinal information about the weights.…”