A STUDY WAS INITIATED IN 12 SECONDARY SCHOOLS TO INVESTIGATE THE EFFECTIVENESS OF FILMED CHEMISTRY AND PHYSICS COURSES. CONTROL VARIABLES WERE USED TO INSURE COMPARABILITY OF EXPERIMENTAL AND CONTROL GROUPS. ACHIEVEMENT, INTEREST, AND ATTITUDE SERVED AS THE STANDARDS BY WHICH THE EFFECTIVENESS OF THE FILMED COURSES WERE JUDGED. BOTH GROUPS WERE PRE- AND POST-TESTED AND THE RESULTS ANALYZED. RESULTS INDICATED THAT (1) THE CHEMISTRY FILMS WERE AS EFFECTIVE AS THE CONVENTIONAL TEACHING BUT THE PHYSICS FILMS WERE NOT AND (2) THE FILM AND NON-FILM APPROACHES FOSTER COMPARABLE STUDENT INTEREST IN PHYSICAL SCIENCE. THE INVESTIGATORS CAUTIONED THAT SOME LIMITATIONS OF THE STUDY MADE IT UNWISE TO DRAW FIRM CONCLUSIONS FROM THE RESULTS OBTAINED. (AL)