M. Söll and S. Uzunbacak spoke at the program workshop: "Quo vadis Berufliche Lehrerbildung? Training teachers for vocational schools: Challenges, starting points, interim results" of the Qualitätsoffensive Lehrerbildung at the University of Osnabrück (online) with the presentation "Focusing on heterogeneity in the development of a business didactic approach to promote lesson planning competence".