This is a brief progress report on the activities of a research and development project commissioned and financed by the Swedish National Board of Education to develop a program of collaboration between preschool and primary school which will provide continuity for children. There are three major subsections of the project: (1) development of new and appropriate forms of activities and materials; (2) organization of various collaborative arrangements and testing of their effectiveness; and (3) collection of social-psychological data on the children in special need of stimulus and assistance. Project staff are also investigating the question of parent education in connection with increased preschool-primary continuity. Each subsection includes a summary of the development of activities and materials in book form useful in preservice and inservice teacher training, a description of the organization and activities of collaboration experiments, and a brief discussion of the aims and plans concerning the social-psychological study and parent education question. (ED)