This 1-year study of seclusion and restraint in an acute inpatient psychiatric hospital revealed a marked difference in reasons and duration for adults, children, and adolescents. Children and adolescents are most often secluded and restrained in response to identifiable patterns of dangerous behavior, and episodes of seclusion and restraint involving children and adolescents are considerably shorter than episodes involving adults. This information is being used to find ways to improve the care and treatment of all patients, especially for children.