Can I turn down a prospetive thesis student?

• If a student has followed a specialization column (20 ECTS) of courses offered by your research group then the student should be offered a thesis project with supervision from you or some other member of your research group.
• You may encourage several students to work together in a single group.  They benefit from internal discussions in the group, and you save time compared to advising them individually. A win-win situation.
• You are not obligated to advise projects that students have come up with.