A summary of the research activities of 13 Head Start regional evaluation centers is presented in three sections: research on children, research on parents and families, and research on classrooms, teachers, and social organizations of Head Start centers. Studies are grouped under appropriate subheadings, such as "language" or "learning," and summarized. Investigators' names, the university at which the work was done, and the purpose, method, and results of the study, as well as implications for further research, are included for each project. An appendix supplies the address, director's name, and university affiliation of each Evaluation and Research Center. A table of contents of the final reports of the universities are supplied, as well as an author index to the actual studies within this digest. (MS)