The active comparator condition (ACC-CT) consisted of an established patient education program for type 2 diabetic patients with conventional insulin treatment. This education program was developed in the 1980s and 1990s and is more didactic-oriented, focusing primarily on the acquisition of knowledge, skills, and information about the correct treatment of diabetes. Both treatment arms (MEDIAS 2 CT and ACC) consisted of 6 lessons, which were conducted as group sessions.