The core of the Conceptual artists (Mel Bochner, Sol LeWitt; the Siegelaub group with Robert Barry, Douglas Huebler, Joseph Kosuth, Lawrence Weiner; English and American members of Art & Language) is situated in the art context of the late sixties and the first half of the seventies. The self-positioning of the Conceptual artists within the art world in texts dealing with art theoretical as well as institutional problems is outlined, and selected works are interpreted.