In this text, primarily for instructors in skill training programs, the concepts and methods of instruction are oriented toward the belief that supervisors and senior employees represent the best source of instructors. Sections of this work deal with such aspects as the rationale and the initiation of on the job training, criteria (personal qualities, knowledge, motivation) for selecting instructors, the supervisor as an instructor, understanding and working with trainees as individuals and as part of the group, techniques for determining and analyzing training needs, guidelines for the planning of sessions and for formal and informal training, the selection of suitable instructional settings (classroom, shop, laboratory, or off the job), the preparation of talks and demonstrations, the nature, components, and problems of communication (including uses of questioning), the purposes, uses, and development of training aids, and means of evaluating the results of training. The document includes an index and 42 illustrations. (ly)