“…67,119 Additional barriers exist across individual (stigma, help-seeking behaviours, mental health status, parental risk factors), community (geographic and social location), and system (funding, waiting times, availability of trained personnel, and fragmentation of services) levels. 120 Several factors affect implementation across these three levels, from the competing priorities of stakeholders involved (children, parents, 121 school staff, educational authorities, and mental health services) to the focus of the intervention (whole school, classroom, teacher, family or screening, promotion, prevention, treatment) and the outcomes of interest (educational achievements, psychological measures, social functioning). Implementation science helps to advance the understanding of core organisation (culture, climate, leadership), classroom, and teaching practices that can impede or aid uptake of evidence-based interventions.…”