THE ENTIRE issue of the REVIEW OF EDUCATIONAL RESEARCH for April 1956 was devoted to reporting studies of instructional materials which had appeared during the previous 10 years. The present chapter, therefore, is limited to investigations reported during 1956, 1957, and 1958. Other reviews will be found in the June 1951 and June 1948 issues of the REVIEW. The years 1956-58 were not fruitful ones for the reporting of research in instructional materials. As Thomas (61) stated, the opportunities for research in this area are so great that existing studies provide a minimum of help to teachers and administrators. He proposed better definition of research areas, more co-ordination of large-scale studies, and better designed and conducted investigations. Broderick (8) also discussed research in printed and audio-visual materials. Although not a research report, the Thirty-Fifth Yearbook of the NEA Department of Elementary School Principals, Instructional Materials for Elementary Schools (46) deserves mention. Included in it were numerous articles on materials in the several curriculum areas, audio-visual aids, the management of instructional materials, and related topics. In 1952, the California Elementary School Administrators Association undertook to define the characteristics of the good elementary school, a state-wide project involving hundreds of educators and laymen over several years. Standards relating to supplies and equipment for the good elementary school were stated in Chapter 5 of the first monograph (9) to emerge from the study. One of the six committees of the Association was concerned with instructional supplies and equipment in each subject area and at each grade level. The committee first defined carefully the major objectives for each area and level, then specified the necessary learning activities and experiences to insure attainment of the objectives, and listed in detail the instructional materials required to facilitate the desired learning experiences. Five monographs (10, 11, 12, 13, 14) reported this work, and two more are promised. One other California project deserves mention. Conner and Noel (19) reported a joint undertaking of the state curriculum commission and a producer of audio-visual materials to produce such materials to correlate with state textbooks in social studies. The Research Division of the National Education Association (47) reported a questionnaire study of 502 elementary-school principals. Only 6 percent indicated that their supply of textbooks was inadequate, whereas one-fourth stated that films, filmstrips, slides, and free and inexpensive materials were less than adequate. About one-half considered their supply of records, tapes, radio and television programs, and graphic materials