Programs that represent major curriculum development efforts in early childhood education are described as to goals and objectives, content and materials, classroom activities, parent involvement, professional and paraprofessional training, administrative requirements and costs, program development and evaluation, and program history and present status. The programs presented are the following: (1) Ameliorative Program (University of Illinois), (2) Appalachia Preschool Education Program (Appalachia Education Laboratory, Inc., Charleston, West Virginia), (3) The Bank Street Model (Bank Street College of Education, N. Y., N. Y.), (4) The Behavior Analysis Model (University of Kansas), (5) The Cognitive Curriculum (High/Scope Educational Research Foundation, Ypsilanti, Michigan), (6) Demonstration and Research Center for Early Education (DARCEE) (George Peabody College for Teachers), (7) Early Childhood Education Learning System (Southwest Educational Development Laboratory, Austin, Texas), (8) East Harlem Block Schools (East Harlem Block Schools, N. Y., N. Y.), (9) Education Development Center Open Education Model (Education Development Center, Newton, Massachusetts), (10) Engelmann-Becker Model (University of Oregon), (11) Florida Parent Education Program (University of Florida), (12) The Interdependent Learning Model (New York University), (13) Primary Education Project (University of Pittsburgh), (14) Responsive Program (Far West Laboratory for Educational Research and Development, Berkeley, California), and (15) Tucson Early Education Model (University of Arizona). A bibliography and references from RIE are given. (DB)