Rough set theory for group decision analysis

The rough set approach proved to be useful in dealing with multi-attribute decision problems There has been. proposed a complete methodology for constructing decision rules preference models form decision examples based on the theory. In this paper, a kind of multi-attribute group decision problems is defined. In order to detect the concordant and discordant parts of the decision rules, we first combine the decision tables from the involved decision makers to induce the decision rules. Then, the composition of the induced rule set is analyzed to illustrate the difference of the decision policies.