The schedules are prepared four times per academic year, before each quarter.
They are normally completed 10 days before the start of the course, provided that the schedulers receive the source material from the teachers in time.
Schedule changes after this point should not occur, unless the change is required for purely administrative reasons or to improve the circumstances for your learning. If a schedule change is needed, it may only be made after consulting you and the other course participants. The senior lecturer for the course is responsible for informing students about schedule changes.