This report discusses the training of personnel who influence the health, education and social integration of children (from birth until school entry age) who live in developing areas or who belong to underprivileged groups in wealthy countries. The report is based on experiments already carried out in various parts of the world and on data collected and discussions held during more than 20 years of educational work by the International Children's Centre team. Chapters include discussions of young children's physical development, community involvement, the training of health personnel, administrators and planners, continuous and inservice training, as well as descriptions of programs and materials. The report emphasizes the connection between the child's physical health, his psychological development and his family and social integration and stresses the need for providing a common base of knowledge for early childhood personnel. (Author/CS)