This article describes interventions produced by school-community local networks in multi-ethnic and disadvantaged communities in Montréal. The fields of activity, objectives, targets and strategies are described and compared for elementary and secondary schools. School partners involved in school-community collaborations, and the structures and dynamics of their collaborative arrangements are also described. The discussion compares theses interventions with the objectives of Québec’s public education and health policies, which promote school-community collaboration. Finally, the article questions actors on possibilities and limits of these kinds of interventions in supporting school success in multiethnic and disadvantaged communities.