AN EXPERIMENTAL POLYSENSORY SELF-INSTRUCTIONAL SYSTEM DESIGNED TO ASSIST STUDENTS IN ACQUIRING AND APPLYING KNOWLEDGE OF THE NATURE, CONVERSION, AND TRANSMISSION OF ELECTRICAL ENERGY AND OF PRINCIPLES OF SIMPLE EELECTRICAL CIRCUITS WAS DEVELOPED AND TESTED FOR EFFECTIVENESS. RELATED LABORATORY EXERCISES WERE AN INTEGRAL PART OF THE SYSTEM WHICH CONSISTED OF A SERIES OF TAPE-SLIDE SEQUENCES PRESENTING INFORMATION IN A LINEAR PROGRAMED PATTERN AND A WORKBOOK IN WHICH THE STUDENTS WERE ASKED TO RESPOND TO A WIDE VARIETY OF QUESTIONS AND PROBLEMS. PARALLEL FORMS OF PRE-TEST AND POST-TEST CRITERION MEASURES DEVELOPED FOR THE STUDY DETERMINED THE KNOWLEDGE GAIN OF THE SAMPLE OF 30 BOYS AND GIRLS IN GRADES THREE THROUGH 12. THE TOTAL MEAN TIME REQUIRED TO COMPLETE THE THREE LESSONS IN THE SYSTEM WAS 3.3 HOURS. THE SYSTEM FUNCTIONED WITH RESPECT TO INDIVIDUAL STUDENT DIFFERENCES AND INDEPENDENTLY OF INSTRUCTOR ASSISTANCE A MAJOR PART OF THE TIME. ANALYSIS OF POST-TEST SCORES INDICATED THAT THE AVERAGE ACHIEVEMENT WAS 60.1 PERCENT OF POSSIBLE ACHIEVEMENT AND THAT VARIATIONS IN ACHIEVEMENT WERE ASSOCIATED WITH DIFFERENCES IN AGE. LOW, AVERAGE, AND HIGH ABILITY STUDENTS LEARNED EQUALLY WELL FROM THE SYSTEM. LISTS OF REFERENCES ARE INCLUDED. (HC)