„Increased student heterogeneity in the classroom may […] have negative consequences for the teachers. In particular, students’ behavioural problems have been associated with higher levels of teacher dissatisfaction and stress. […] It has also been indicated that larger class size is related to higher levels of burnout and exhaustion.“
Univ.-Prof. Dr. Timo Saloviita u. a., Teacher burnout explained: Teacher-, student-, and organisation-level variables. In: Teaching and Teacher Education 97 (2021), S. 3.