Published version of an article in the journal: Mathematical problems in engineering. Also available from Hindawi: http://dx.doi.org/10.1155/2012/619162Many linguistic aggregation methods have been proposed and applied in the linguistic decision-
making problems. In practice, experts need to assess a number of values in a side of reference
domain higher than in the other one; that is, experts use unbalanced linguistic values to express
their evaluation for problems. In this paper, we propose a new linguistic aggregation operator to
deal with unbalanced linguistic values in group decision making, we adopt 2-tuple representation
model of linguistic values and linguistic hierarchies to express unbalanced linguistic values, and
moreover,we present the unbalanced linguistic ordered weighted geometric operator to aggregate
unbalanced linguistic evaluation values; a comparison example is given to show the advantage of
ourmethod