Group preference aggregation methods employed in AHP: An evaluation and an intrinsic process for deriving members' weightages

SUMMARY

An important problem in decision analysis is the evaluation of the difference between two or more different rankings for a set of alternatives. A novel model based on the aggregation technique for combining group member's preferences into one consensus ranking is suggested in this article. The model developed may be used to develop consensus and evolve ranking of alternatives. The application of the model is demonstrated through a case for supplier rating. The advantages of the proposed approach are also highlighted.

A multi-criteria group decisionmaking model for supplier rating

Interactive group decision making procedure under incomplete information

A preference aggregation method through the estimation of utility intervals

Interactive decision aiding for group decision support

This paper first contrasts issues in single and group decision making. It highlights the importance of approaching group decision making as a process that benefits from using models. Some key observations of decision support in real life applications are described, and the problems of combining individual preferences into a group choice are examined. This is followed by two case studies where judgemental models were used to support the decision process. In each example, the problem structure, the preferences of the individual decision makers, the overall decision process and the resulting decisions are given in detail. The cases provide insights into how groups use such judgemental information in discussion, negotiation, and the reaching of an agreement. Our results suggest that simple aggregation/consensus models are not satisfactory.

Gred Islei

Papers

Group decision making: Suppositions and practice