Abstract: With respect to the group decision making problem with multi-granularity linguistic preference relations,a method based on two-tuple linguistic information processing for aggregating individual preference relations is proposed.In the method,firstly,the definition of multi-granularity linguistic preference relation is given.Then,a transformation function is given to uniform the multi-granularity linguistic preference relation into the format of two-tuple linguistic information assessed in basic linguistic term set.Based on the two-tuple weighted average aggregation operator and the linguistic dominance degree developed recently,the unified preference information is aggregated into the group preference and the most desirable alternatives is selected.Finally,an example is used to illustrate the use of the proposed approach.

Key words: group decision making, multi-granularity, linguistic preference relation, two-tuple, aggregation, alternatives selection