The ISO believes that the performance of students depends to a large extent on the quality of their teachers. For this reason, it is important that teachers are sufficiently qualified with the skills that are needed to give lectures and classes. Such a qualification (the BKO) was jointly recognised by all universities 10 years ago, while the comparable qualification for universities of applied sciences (the BDB) is not yet generally recognised. In addition, student lecturers are increasingly being used to teach. The quality of these student teachers varies and is not yet structurally guaranteed.