Prosociality is a multifaceted concept referring to the many ways in which individuals care about and benefit others. Human prosociality is foundational to social harmony, happiness, and peace; it is therefore essential to understand its underpinnings, development, and cultivation. This handbook provides a state-of-the-art, in-depth account of scientific, theoretical, and practical knowledge regarding prosociality and its development. Its thirty chapters, written by international researchers in the field, elucidate key issues, including: the development of prosociality across infancy, childhood, adolescence, and beyond; the biological, cognitive, emotional, and motivational mechanisms that underlie and influence prosociality; how different socialization agents and social contexts can affect children's prosociality; and intervention approaches aimed at cultivating prosociality in children and adolescents. This knowledge can benefit researchers, students, practitioners, and policy makers seeking to nurture socially responsible, caring youth.

Presenting cutting-edge work from leading scholars, this authoritative handbook reviews the breadth of current knowledge on aggression from infancy through adolescence. The volume explores the forms and functions of aggression and the multiple factors that contribute to its emergence, development, and consequences, including genetic and biological influences, temperament, family dynamics, peer relations, and social inequality. It provides up-to-date perspectives on problems such as disruptive and defiant behaviors, bullying (including cyberbullying), social aggression, and youth violence, and examines relations between aggression and normative social-emotional and social-cognitive development. It also discusses the opposite end of the spectrum, including kindness and prosocial behaviors. Identifying important implications for practice and policy, contributors describe effective approaches to screening, assessment, and intervention in family, school, community, and clinical settings.