After a review of existing courses and methods in Great Britain for training full-time instructors, a study was made of inplant and out of plant systems of on the job training using experienced workers as part-time instructors. This emerged as the training approach most often used, especially for machine operators and among the many small firms which cannot employ their own training specialists or participate in group schemes. It was decided that such methods deserve greater recognition and encouragement by industrial training boards. The role of managers and supervisors in helping such programs to function properly was discussed, together with training objectives, training techniques, four examples of course types, selection of trainees, and other aspects of organization and administration. Time allocations were suggested as follows: background information and talks on instructional theory and techniques, 25%; practical demonstrations and individual exercises, 25%; practice on the shop floor or in the office, 50%. Programs in the iron, paper box, rubber, and steel industries were used as illustrations. (The document includes sample syllabuses and other appendixes.) (ly)