The magic word for maintaining and continuously expanding the alumni network is: Student-Alumni Life Cycle. Ideally, this means that graduates become aware of the alumni network while they are still students, realise that they are part of this community when they graduate, at the latest, and remain loyal to it for the rest of their lives.
This is not primarily about nostalgia, but about the benefits that both the alumni and the university can derive from it. At the Filmakademie, for example, a number of alumni are active in teaching as guest lecturers, in programme coordination or project support.