"Rückmeldung" is an important administrative act. Each student must re-register at university's student registration office (Studierendensekretariat) at the start/end of each semester. Part of the process also involves paying the semester fee. Students who do not do this will not be able to continue studying in the next semester. Some universities offer the option of online re-registration. It is very important that the re-registration deadlines are met, otherwise the university will strike the student off the university register (i.e. will exclude the student from the studies).