This compilation of readings in educational media and research makes accessible published and unpublished documents relevant to designers and users of educational media. Volume III includes part 6, "Learner Characteristics," and part 7, the "Conditions of Media Use.""Learner Characteristics" relates the nature of human aptitude to instructional media research and practice, considers the characteristics of a learner as member of an audience, and studies eye-movements and television viewing. "The Conditions of Media Use" demonstrates some applications of instructional media to instructional practice. The strong influence of film, media policy making, areas of needed research, choice of a specific medium for instruction, and instructional media research in teacher education are considered in seven papers. Extensive bibliographies follow these papers. The sources of the papers in these three volumes are AV Communication Review and the research in instructional media made by the United States Government. Dr. Allen's headings in these three volumes of readings are the same as his headings in "A Course of Study and Bibliography for Instruction in Educational Media Research and Theory. (MM)