In the field of multi-objective optimization there have been attempts to reduce the number of objective function evaluations by the use of surrogate models. However, in manyobjective optimization, this work still has to be done to make the optimizers more practically usable.In this paper we show, that aggregate meta-models can be used even for the many-objective optimization and that they can also improve the performance of the many-objective optimizer. Moreover, meta-models are discussed from another point of view and compared to scalarization techniques in many-objective optimization.Two algorithms using our models are compared to IBEA on a set of selected benchmark functions with 5, 10, and 15 objectives.Index Terms-Many-objective optimization, meta-models, surrogate models, evolutionary algorithms.