This book presents and integrates innovative ways in which the disciplines of school, clinical, and counseling psychology conceptualize and approach mental health assessment, prevention, and intervention for promoting child and youth well-being. It describes a synthesized model of clinical reasoning across school, clinical, and counseling psychology that demonstrates how decisions are made with respect to assessment, prevention, and intervention across situational contexts to ensure successful outcomes for children and youth. In addition, the volume examines theoretical,empirical, and practical frameworks and methods with respect to addressing the mental health and well-being needs of children and adolescents within and across school, clinical, and counseling psychology disciplines. In addition, the book presents transformative, constructivist, multicultural, innovative, and evidenced-based approaches for working with children and youth as well as their families relative to the identification of mental health concerns, enhanced service system integration, social justice and advocacy. This book is an essential resource for researchers, clinicians, therapists, practitioners, and graduate students in clinical , counselling,and school psychology, social work, educational psychology, child and adolescent psychiatry, developmental psychology, pediatrics and all interrelated disciplines.