The National Association of Social Workers' The Encyclopedia of Social Work has long been considered the cornerstone reference in the field. The new, completely updated, revised and expanded 20th edition includes 400 articles covering all aspects of social work including: practice and interventions; social environments; social conditions and challenges; and social policy and history. This new edition of the Encyclopedia includes coverage of areas that have come to the fore since the 1995 19th edition, including demographic changes from immigration, evidence-based practice, gerontology, and trauma and disaster. International entries include: International Association of Schools of Social Work; International Federation of Social Workers; International Social Welfare - Organizations and Activities; International Social Work and Social Welfare - Africa, Asia, Australia and Pacific Islands, Caribbean, Central America, Europe, Middle East and North Africa, North and South America.