Instead of streaming students into ability groups, teacher teams apply within-class differentiation, alternating between basic teaching for the whole class and add-on content for highly motivated students or extra support for less-motivated students. Generally, there are three teachers working with the group in the humanities, natural sciences and a vocational field, with at least one of the three having experience in teaching students with special education needs. As a result, there is less misconduct in classes, and low achievers have improved their academic performance.