This paper furnishes preliminary reports on four film research projects to determine: the relationship of length and fact frequency to the effectiveness of instructional motion pictures, the contributions of film introductions and film summaries to learning from instructional films, the effects o f repetitive film presentations on learning, and the relative contributions to learning of video and audio elements in films. About 6300 people were used for the testing of experimental film versions between July and November, 1949, and the data collected was processed by IBM machines. Two-thirds of this paper describes in detail the procedures of the tests. Tentative conclusions are stated at the end of the report on each test, and the paper includes a bibliography of reports. (GO)