This report, part of a two-volume set, is intended to provide union groups, employees, child care educators and advocates, day care consultants, and other interested groups with information regarding the state of the art of on-site day care in America today. The first section of the report reviews the past and current literature and experience of on-site day care centers in the United States and in other countries. Included are those centers located in industry, federal and state government facilities, hospitals, the military (in New York state) and on college campuses. The second section delineates generic models of on-site day care as abstracted from former and current operations, outlines specific components of organizations, benefits, problems, and evaluation strategies related to each model, and identifies program characteristics associated with successful models. The third section provides guidelines for employers interested in conducting a study of the feasibility of establishing an on-site center. (Author/MP)