Conduct disorder (CD) is a repetitive and persistent pattern of behavior that violates the rights of others or age-appropriate norms and causes significant impairments in various domains of functioning. CD accounts for a substantial number of youths who enter into mental health facilities in the United States and Canada, and for this reason it is an important disorder for researchers to investigate and for clinicians to treat. Although CD continues to be problematic for the individual and society, remarkable progress has been made in our understanding of CD. Subtyping approaches have helped reduce some of the heterogeneity of the disorder and provide a better understanding of the potential etiologies associated with various types of CD. In addition, intervention programs have been developed that have been ...