hierarchical structure

Different decision-making models are applied for assessing the combating desertification alternatives and providing optimal alternatives through taking into account the total effective measures that sometimes the results of the prioritization of these models are not consistent. This issue depends on the nature of the model, the considered criteria, and the way of weighing the criteria as a group by the experts. So, there is need for presenting some functions in some groups to prioritize the alternatives offered in each region by the different models on the basis of logic and strong principles and theoretical foundations. In this paper, it has been tried to do so by using the social welfare functions. The function of Group Ranking Value (GRV) was used in this study and the combating desertification alternatives resulted from the 13 decision-making models in the Khezrabad Region of Yazd were analyzed. In this regard, after the formation of coordinated and uncoordinated sets, different solutions were estimated in each set and finally, the objective function (Tobj) was calculated for any of the resulted solutions in order to achieve the final solution. The solution with the highest T value was presented as the final and collective alternative. The obtained results indicated that the first solution or in other words, the alternative order of A18>A23>A31>A20>A23 is the best order for the presented alternatives.