In this study, we sought to determine if various processes and outcomes of training would be affected by discrepancies in trainees' levels of work experience. The study consisted of a field experiment, in which forty-nine inexperienced and twenty-one experienced university resident assistants (RAs) were trained in conflict mediation, under either a homogeneous condition, in which all trainees were inexperienced, or a heterogeneous condition, in which experienced and inexperienced RAs were evenly represented. Inexperienced RAs in the two conditions were compared on the basis of participation levels, satisfaction with the content and process of training, gains in self-confidence and knowledge of subject matter, and transfer of learning to workplace situations. Inexperienced RAs were found to experience greater comfort in contributing to the training process under the homogeneous condition than under the heterogeneous condition ( F = 4.43, p <.05). The remaining variables were not affected by the composition of the training group.