FIVE METHODS OF TEACHING INSTALLATION, OPERATION AND MAINTENANCE OF PORTABLE, ELECTRIC-POWER GENERATING EQUIPMENT TO ENLISTED MEN WERE COMPARED. METHODS WERE--38-HOUR CONVENTIONAL INSTRUCTION, 38-HOUR INTENSIVE TV INSTRUCTION, AND 3 16-HOUR TV COURSES, USING EXPERIENCED AND INEXPERIENCED INSTRUCTORS, AND KINESCOPE RECORDINGS. A POST-SELECTION, RANKING PROCEDURE EQUATED 36 TRAINEES ON APTITUDE DIFFERENCES. STATISTICAL ANALYSIS OF SCORES ON IMMEDIATE POST-TESTS AND RETENTION TESTS 1 MONTH LATER SHOWED THAT TRAINEE LEARNING AND RETENTION FOR THE 38-HOUR CONVENTIONAL AND TV INSTRUCTION WERE SUPERIOR TO THAT FOR ANY OF THE 16-HOUR COURSES. AMOUNT OF INSTRUCTOR EXPERIENCE WAS NOT RELATED TO LEARNING IN THE 16-HOUR COURSES. KINESCOPE INSTRUCTION WAS AS EFFECTIVE AS 16 HOURS OF TV INSTRUCTION WITH EXPERIENCED TEACHERS. THERE WAS NO SIGNIFICANT DIFFERENCE IN RETENTION IN ANY OF THE 16 HOUR COURSES. IMMEDIATE SCORES SHOWED HIGH APTITUDE TRAINEES LEARNED AT LEAST AS MUCH IN 16 HOURS AS LOW APTITUDE TRAINEES IN 38 HOURS. NO SIGNIFICANT RELATIONSHIP WAS FOUND BETWEEN NUMBER OF TRAINEES DROPPED AND INSTRUCTIONAL METHOD. COST SAVINGS DUE TO USE OF TV WERE INDICATED. DATA ARE REPORTED IN TABLES SHOWING STATISTICAL SIGNIFICANCE LEVELS BASED ON ANALYSIS OF VARIANCE AND T-TESTS. (LH)