Show 17 I the same impetus to education audio-visu- al i The effect of the War Department policy was such forces during the four years of the war have produced i that the arced than six- - more fold as great a number of motion pictures and film strips as had ever been produced before Research in Research r"T 19 for strictly educational purposes audio-visu- al years occupied a larger place than it had education in the post-w- ar for several years For example in the Instructional Film Research Program at College a series of experimental films sions of films in a common was produced Penn i State Different ver- subject area were produced so as to control systematically a number of variables After testing these experimental 'films and variables on matched groups it was could be quantitatively related which j result from the film to the demonstrated that they amounts and kinds of instruction alone Therefore possible to define the factors which in the film medium it learning became contribute either positively or negatively to learning or to the attitude and opinion changes Communication in the Modern World” Audio-Visu- al Yearbook of the National Materials of Instruction (Forty-Eigh- th Floyd E Booker w Part I Chicago: Society for the Study of Education Ghicago Press 19A9) pp 16-- 17 19 Use of University of Training Aids in the Armed Services: Some Implications for Civilian Education (United States Office of Education Bulletin Government Printing Office 19A5) p 21 No 9 Washington: ! |