A Novel Consensus-seeking Approach in a Group Decision Making Environment
Authors: Michael Angelo B. Promentilla
Abstract
This paper proposes group consensus index (GCI) as a new consensus measure to assess the level of consensus in AHP-group decision making. GCI is a weighted consensus that incorporates the individual’s influence on group decision while evaluating the compatibility or closeness of ratioscale vectors between the individual and the groupaggregated priorities. In such a way, the quality of group decision that reflects the consensus situation can be examined in a more realistic way. The GCI is then used to guide the consensus-seeking process until the final consensus decision is achieved whether the situation necessitates the participants to compromise and modify their judgment or not. The provided numerical examples illustrate the feasibility of the proposed approach in which the results demonstrate its capability and flexibility to support consensus.