Linguistic Modelling in Group Decision Making Linguistic Modelling in Group Decision Making

Sometimes, an individual may have vague information about the preference degree between two alternatives and can not estimate his preferences with an exact numerical value. Then, a possible approach is to use linguistic assessments instead of numerical values, that is, to suppose that the preference relations are assessed by means of linguistic terms. A scale of certainty expressions, linguistically assessed, is presented to the individual who can then use it to describe his degree of certainty in a preference. This contribution summarizes a description on the linguistic modelling in group decision making. We review the linguistic approach in decision making and an aggregation tool of linguistic information based on a Linguistic Ordered Weighted Averaging operator modelling the fuzzy majority concept, and present a linguistic decision process guided by fuzzy majority. The decision process is composed by consensus and choice processes and summarizes the consensus and choice processes in linguistic context that we have proposed through of our researching works.