Demographic and other descriptive data on a hypothetical metropolitan area (Dixon City, Tiller County) are presented in the report, which is intended as a health study and training model. Most of the statistical and descriptive data are drawn from a health training model developed by the Communicable Disease Center, U. S. Department of Health, Education, and Welfare, with emphasis on selection of data relevant to child health and child development. Information is given on the hypothetical community's general characteristics, education, medical personnel, major medical facilities, clinic operation, health department operation, services for the economically disadvantaged, and non-governmental agencies. The hypothetical community was developed to serve as a frame of reference for a workshop on the identification and treatment of developmental disorders among preschool children. It is intended to provide an adequate base on which to plan a model preschool screening and treatment system. (KW)