There is, in fact, no degree or kind of employment for which a more intelligent and satisfactory selection of employees cannot be made by means of properly devised mental tests, accurately applied, than by any other method now in use. Under the direction of Dr. Walter Dill Scott the Carnegie School of Scientific Salesmanship of Pittsburgh has demonstrated the usefulness of the scientific method when applied not only in the selection and training of salesmen but for the choosing of men qualified for the most important executive positions in large industrial and business establishments. A large number, possibly as many as a hundred, of the largest industrial corporations of America have already (1919) adopted in whole or in part some system of scientific mental tests for the classification and grading of present employees, the selection of new employees, and the filling of vacancies by promotion. It is the unanimous testimony, whenever a properly devised system of tests has been applied in accordance with scientific methods and without prejudice, that the actual saving in time and expense as well as in the disorganization resulting from a heavy “labour turnover” has in every case been highly profitable from the employer’s viewpoint, while it almost goes without saying that the benefit to the employee in being accurately placed in the position in which he is best fitted by his natural mental endowment and capacity to function makes for individual contentment and satisfaction and for steadier and presumably higher earning power than the old hit-or-miss method could possibly do. Next to the beginner in industry or business, the boy or girl starting his or her vocational career, the class to which the application of scientific mental tests is of the greatest benefit to employer and worker alike is the large group of unskilled, untrained workers, men and women of no particular trade, the “floaters” and seasonal workers, who turn their hands to whatever employment opportunity offers without developing especial skill at any one recognized trade or occupation. In our modern industrial system, a very considerable part of the personnel of our factories, shops, and stores consists of this class of untrained workers. They try their hands at many things and fail in most. They constitute the majority of those who respond to “Help Wanted” advertisements and are willing to try any sort of work; their chief occupation in life is hunting for jobs.