This series informs policy and evidence-based practice to improve outcomes for children and youth. By incorporating collaborative community research, this series uses systemic approaches to changing front-line practice and encourages further discussion and collaboration among researchers, policy-makers, practitioners, students, and interested stakeholders on such topics as early intervention in psychosis, eating- and weight-related disorders, aggressive-behaviour problems, and marginalized youth in educational contexts. The series originates from the Community Health Systems Resource Group at the Hospital for Sick Children.