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This volume of the Final Report on the Interpretive Study of Research and Development in Elementary School Mathematics co Atins materials which are most appropriate for the researcher. Whether h ( is working at the pre-doctoral level or the post-doctoral level, the researcher has a recurrent need to know the results of previous research, and the status of the topic to be explored. One of the difficulties which any researcher faces is locating those studies which will be of most use to him. Prior to this time, no single source of information on research in elementary school mathematics was available. Instead there were various types of lists, no one of which was complete or current. The compilation of reports of research on elementary school mathematics was begun in a dissertation by Suydam in which 799 reports are categorized, annotated, and evaluated. This volume extends this compilation, with 306 additional reports listed. This represents an updating to include reports published in journals between 1966 and 1968, plus those with pre-196