Preferential Voting Based on Undesirable Voters

The idea that voters are divided into desirable and undesirable categories, and desirable category votes have a positive effect and undesirable category votes have a negative effect on candidate evaluation is a theory that may not seem very logical at first glance. But proposing this theory and presenting models for handling the preferential voting process in the presence of desirable and undesirable voters will eventually lead to the proposal of a method to solve MADM problems, which has many advantages. In this chapter, preferential voting and group preferential voting in the presence of desirable and undesirable voters are examined and models for handling such voters are presented. Then, using the presented models, a MADM method will be presented to determine the weights of alternatives and criteria, where there is no need to change the nature of the criteria in the process of normalizing the decision matrix.