Advances in the standardization, precision and thoroughness of psychiatric diagnosis are being supplemented with attention to personalized or ideographic descriptive approaches. This promises not only to enhance the clinician's understanding of a case but to allow a fuller and more effective use of the evolving range of therapeutic possibilities. To reflect these developments, the Section on Classification, Diagnostic Assessment and Nomenclature of the World Psychiatric Association has prepared this volume which is organized around five prominent themes in contemporary psychiatric diagnosis: -major regional perspectives - ICD-10 - comprehensive diagnosis through the multiaxial model - treatment planning and organization of health services - the role and challenges of psychiatric diagnosis in primary health care.