Group decision aiding by Interval AHP with compromise and refinement

Interval AHP was proposed to express the deci-sion maker’s vague evaluations on criteria by inter-val weights from a given pairwise comparison ma-trix. It has been extended to group decision prob-lems. Three complementary approaches have been proposed: the perfect incorporation approach for counting out indubitably inferior alternatives and the common ground and partial incorporation ap-proaches for finding agreeable preference between alternatives. In this paper, we enhance those ap-proaches by working out conceivable compromise and refinement. Compromise solution and refine-ment solution can be found by solving linear pro-gramming problems