“…Furthermore, learning this in the context of conflicts between informal groups might be easier, for students and for teachers, than in the context of conflicts between formal and stable groups such as youth gangs. Many innovative strategies have been developed that promote peaceful ways to manage interpersonal conflicts in school contexts (e.g., Burrel et al, 2003;Chaux et al, 2017;Duckworth et al, 2019;Durlak et al, 2011;Ellis, 2019;Gonz alez et al, 2019;Hakvoort, 2010;Johnson & Johnson, 1996;Jones et al, 2011;Kreidler, 1991;Mytton et al, 2006;Wilson et al, 2003). However, very few address directly and explicitly intergroup conflicts (e.g., Greniez, 2019;Rodríguez, 2014), in spite of the amount of violence that comes from intergroup interactions.…”