This brief approaches the challenging topic of child sexual abuse from an objective, evidence-based perspective. It offers an overview of child sexual abuse, including definitions and a clear explanation of the epidemiology. The text also explores the conceptual frameworks that seek to explain how a child comes to be sexually abused by an adult or older adolescent.   In the chapters, the authors present credible prevalence and incidence studies that are used to provide a scientific response to how common this problem is. In addition, they address the policy implications for a myriad of prevention and treatment initiatives as well as related issues such as delayed reporting and the risk for sexual abuse within child serving organizations. Finally, the brief concludes with the authors  recommendations for the future on how best to prevent child sexual abuse in the first place.