Inclusion Criteria:  Written informed consent (if underaged by parents & minors themselves)  Students: Enrollment in class 4 of primary school  Teachers: All teachers employed at the school  Schools:  Public or community schools Mixed-gender schools Day schools At least 40 students in selected class/stream  Exclusion Criteria:  Students and teachers:  Acute drug or alcohol intoxication Acute psychotic disorder  Schools:  • Previous training on violence prevention