Impulsivity features prominently in contemporary descriptions of many psychiatric disorders, and is also a key element in the clinical risk assessment of violence. Thoroughly examining the nature, assessment, and treatment of impulsive conduct, this up-to-date volume brings together contributions from prominent researchers and clinicians in both mental health and correctional settings. Chapters illuminate our current understanding of impulsive behavior from conceptual, legal, and biological perspectives, and address the challenges of describing and measuring it. Special features include several invaluable 20-item checklists designed to aid in risk evaluation with mentally disordered persons, potentially suicidal correctional inmates, spousal assaulters, and sex offenders. Impulsivity provides a comprehensive overview of the current state of the research and delineates a broad, clinically pertinent agenda for future study.