The study examined the effects of an advance organizer on the learning and retention of facts and concepts obtained from a sound film by educable mentally retarded (N=30) and regular children (N=30) in a mainstreamed secondary public school class. Also examined was the interaction between the advance organizer and ability levels of the Ss. Results indicated facilitative effect of the advance organizer for both groups; however, ability levels did not differentially affect the learning outcomes. The implications for teachers in the mainstreamed class include the desirability of teachers previewing advance organizers of films rather than previewing the film in its entirety. References and data tables are appended. (Author/CL)