1. Challenges schools face during the COVID-19 crisis and how they change over time. Vortrag im Rahmen des invited Symposium “Educational Effectiveness and Improvement During COVID-19: Challenges and Lessons” Autoren: Feldhoff, Tobias; Jude, N; Maag Merki, K; Radisch, F; Brauckmann-Sajkiewicz, S; Maaz, K Typ: Konferenzbeitrag