An overview of the Dunedin Multidisciplinary Health and Development Study (DMHDS), an ongoing longitudinal study of 1037 babies born in Dunedin between 1 April 1972 and 31 March 1973. The study has generated more than 500 specialist papers in scientific journals, unpublished research reports, theses, etc. This book presents the major findings in a form accessible to the non-specialist.