H K Aggregation Functions, Measures and Integrals

In many decision making problems evaluations of possible alternatives of choice, with respect to several points of view (criteria) are expressed by means of h−interval (or fuzzy numbers). For example a pessimistic and an optimistic evaluation generate an interval containing the exact evaluation. These situations reflect lack of information or uncertainty on the same evaluations. In this paper we discuss h− k−aggregation functions that aggregate several h−interval evaluations into an overall evaluation, again expressed in terms of a k−interval.