This paper had not been easy to prepare because any adequate treatment of recent investigations and research would have to pre-suppose in the engineer-reader a whole body of information which it would not be reasonable to suppose he has. Further, the author's pitch had been cleared, for nearly three years ago the Institution of Production Engineers published a paper by him entitled : "A Survey of Selection and Allocation for Engineering Occupations."

After much thought, he decided to deal mostly with some of the fundamental ideas underlying selection, and to offer a bibliography to assist readers who so desire, to gain further knowledge of the underlying facts and theories of Occupational Psychology and of the application of these to investigations which have been carried out in the allied fields of vocational guidance and selection, and to procedures which are being increasingly used.