This book briefly discusses several published works on violence among children and adolescents, organizing the research on factors related to violence by age group and type of environment and examining the environmental factors that contribute to violence and the role played by the mass media. It also presents a theoretical model that identifies the factors and processes that lead to violence or follow from it as a frame of reference for understanding how to prevent this phenomenon. Based on the model's components, the study reviews research on violence prevention in families, schools, and com.