Dealing with different trainees is part of the everyday routine of many trainers. Vocational teaching competencies are the principal requirement in this regard. But how are these competencies specifically imparted, and where do trainers get ideas on how to cope with heterogeneity? Textbooks to prepare for the AEVO examination may be one opportunity. This article highlights the way in which heterogeneity is addressed in such textbooks and examines their suggestions for handling heterogeneous groups of trainees.