As the CPO deems the instructional aspects of a course to be very important, a maximum of forty students are allowed per course. One the one hand this group size provides enough interested parties with the possibility to attend the course whilst on the other hand the students get maximum value out of the course, e.g. because there is more opportunity for interaction between students and lecturers. After every session our students fill out an evaluation form, which enables us to guarantee the quality of our courses. The outcome of the assessment enables us to adapt our courses, in terms of substance and organization, if necessary.