Depending on the respective unit, instruction happens through lectures, practical demonstrations with discussion, seminars (students presenting papers to be discussed), practical courses (demonstration and practice of special skills), self-instruction, specified reading, and students’ fieldwork with presentation and discussion of results and problems.  Students are encouraged to participate actively during the seminars and lectures, by questioning concepts and expressing views and opinions readily.  The students’ critical response is asked for, not passive consumption and reproduction of information.