The chapter is devoted to the first professorship at the University of Bielefeld, the specific orientation of that university, the colleagues, the interdisciplinary contacts, in particular with colleagues from history (Kosellek, Wehler, Kocka), political science (Offe) and sociology (Luhmann), his directorship at the Centre for Interdisciplinary Research (ZiF) of Bielefeld University, his project on “Functions of the State” at the ZiF and the other subjects of his research in these years (1979–1987)