At the conference of the Gießener Offensive Teacher Education (offensive of quality,…), 8th – 9th April 2019 at University Gießen Dr. Bernhard Rauh (chair), Prof. Dr. Margit Datler, Dr. Jean-Marie Weber and PD Dr. Sven Sauter (Debater) arranged the symposium „Professionalization for exposure to heterogeneity whereby reflexive internships“.