This issue on Recent Research on Personality Behaviors discusses diagnosis, epidemiology, etiology, outcome and treatment for these perplexing disorders. Topics include:: Diagnosis:: Dimensional diagnosis for PDs, Improving categorical diagnosis of PDs, Separating traits from personality disorders. Epidemiology:: The community prevalence of PDs, The clinical prevalence of PDs. Etiology:: Genetics of PDs, Neurobiological and imaging studies, The neurobiology of psychopathy, Child development and PDs. Outcome:: The long-term outcome of PDs, Mechanisms of recovery in PDs. Treatment:: Pharmacological and psychotherapeutic treatments, Managing suicidality, Future directions in PD research.