In so far as particular business enterprises have rested on engineering, chemistry, biology, and other sciences, a scientific method of approach has long had large use in business; but the scientist in business has usually been a salaried expert--a man apart from the management--and it has been his results, and not necessarily his methods, that have influenced business practice. We are now coming to understand that scientific method is the only sure approach to all problems; it is a thing of universal application, and far from being confined to the technical departments of business, where the technical scientists hold sway in their particular specialties, it may have its widest application in working out the problems of management. The way in which a man trained in scientific method may determine business practice in a scientific manner finds illustration in a multitude of practical business problems, ranging all the way from the simplest office detail to the most far-reaching questions of policy. To cite an example, of the simpler sort: if an item in an order sheet is identical for eight out of ten orders is it better to have a clerk typewrite the eight repetitions along with the two deviations or to use a rubber stamp? Of course, there are not one or two, but many, items in an order sheet and the repetitions and deviations are not the same for all items. In practical application, the rubber-stamp method means a rack of rubber stamps placed in the most advantageous position. It requires also a decision as to the precise percentage of repetitions which makes the stamp advantageous. Then arises the further question, why not have the most numerous repetitions numbered and keyed and thus avoid the necessity of transcribing them at all? The rule-of-thumb approach to this kind of problem would proceed from speculations concerning the effect of interrupting the process to use the stamp, the result of such interruptions on the accuracy of work, difficulties in the way of necessary physical adjustments, and many other questions that would occur to the practical manager. The scientific method of approach would first inquire whether there are any principles derived from previous motion study or other investigations, that apply to the case in hand. In accord with such principles it would then proceed, as far as possible, to eliminate neutral or disturbing third factors and to arrange a test. The results of the test would lead, either to a continuance of the old practice, or to the establishment of a new practice for a certain period, after which, if serious difficulties were not revealed, the new practice would be definitely installed.