Youth development represents a complex set of individual transitions embedded in a particular socio-political environment, cultural context, and historical timing. Though turning points are experienced across the life span, changes may possibly be even more salient in youth given the fundamental biological, cognitive, psychological, and social transformations occurring at this developmental stage. This book is a joint effort by American, European, and Asian scholars who provide a multi and interdisciplinary view of the current state of youth development and discuss a world-wide range of timely issues. Topics discussed include health concerns for youth in the areas of evaluation of nutritional outcomes, heightened risks of cardiovascular disease, psychiatric treatment, and mental health; and socialisation and contextual effects are also covered in the areas of youth violence, bullying and cyber-bullying; treatment needs in substance use disorders, contexts outside school and family, and challenges in the school environment.