This final report of the Family Development Research Program contains a description of the program's comprehensive family service approach to promoting child development and the longitudinal findings on program effectiveness. The program offered comprehensive services to 108 families which were low in both income and education. Services included: (1) home visits for expectant mothers to teach them about nutrition and child care; (2) complete center-based child care for children from 6 to 60 months of age; (3) assistance for families with financial, emotional, social, and nutritional proglems; and (4) parent involvement groups, workshops, and open-houses. Inservice training was held weekly for teachers and paraprofessional home visitors. The final report presents theoretical and research foundations of the program, curriculum objectives, selection and organization of content, staff roles, staff training, delivery systems, evaluation and conclusions. Tabular data and a bibliography are included. (JMB)