This document reports on a descriptive study of mental health crisis response systems. It was sponsored by the Center for Mental Health Services as part of its continuing effort to support knowledge development & dissemination relevant to critical aspects of mental health service delivery for persons with long-term mental illness. Chapters: overview of mental health crisis services; telephone crisis services; walk-in crisis services; mobile outreach crisis services; residential crisis services; inpatient crisis services; selected references; & list of respondent communities & agencies by State. Seven exhibits & thirty tables.