One hundred twenty-four research reports were included in the bibliography. This compares with 120 in the previous ERIC Center review, A Summcuy ofResearch in Science Education for rhe Years of 1965-1967.jQ Although different criteria may have influenced bibliographic inclusion in this review and the earlier one, these figures provide a rough indication that the quantity of research related to science instruction at the elementary school level has increased. Since the earlier review covered a three-year period, a sizable increase in the yearly volume of research is indicated.Not all of the reports included in the bibliography were reviewed. Criteria for inclusion were: significance of the question investigated, validity of research design, rigor of data interpretation, and adequacy of reporting. Since all the criteria are somewhat subjective, the biases of the reviewer undoubtedly entered into judgments.Reports reviewed were categorized as follows: New elementary science programs: studies of the effects of instruction Studies of the impact of instruction: Pre-school and primary school Studies of the impact of instruction: intermediate grades Developmental studies without instruction Studies of cultural influences on intellectual development and science learning Studies of teacher education Studies of teacher behavior and characteristics Instrument development Miscellaneous studies. This categorization, which does not coincide precisely with the ERIC classification scheme, was chosen because the reviewer felt it represented a more functional grouping of the studies reported during 1968 and 1969. *Sponsored by the Educational Resources Information Center of the United States Offices of Education and The Ohio State University. Prepared phsuant to a contract with the Office of Education, United States Department of Health, Education, and Welfare. Points of view or opinions expressed herein do not necessarily represent official Office of Education position or policy.