Four decades of research on school bullying: An introduction.

This article provides an introductory overview of findings from the past 40 years of research on bullying among school-aged children and youth. Research on definitional and assessment issues in studying bullying and victimization is reviewed, and data on prevalence rates, stability, and forms of bullying behavior are summarized, setting the stage for the 5 articles that comprise this American Psychologist special issue on bullying and victimization. These articles address bullying, victimization, psychological sequela and consequences, ethical, legal, and theoretical issues facing educators, researchers, and practitioners, and effective prevention and intervention efforts. The goal of this special issue is to provide psychologists with a comprehensive review that documents our current understanding of the complexity of bullying among school-aged youth and directions for future research and intervention efforts.