The Principles of Scientific Management

122 THE PRINCIPLES OF SCIENTIFIC MANAGEMENT unless one has seen first the old plan and afterward the new tried upon the same man. And in fact until one has seen similar accurate experiments made upon various grades of workmen engaged in doing widely different types of work. The remark- able and almost uniformly good results from the cor- rect application of the task and the bonus must be seen to be appreciated. These two elements, the task and the bonus (which, as has been pointed out in previous papers, can be applied in several ways), constitute two of the most important elements of the mechanism of scientific management. They are especially impor- tant from the fact that they are, as it were, a climax, demanding before they can be used almost all of the other elements of the mechanism; such as a planning department, accurate time study, standard- ization of methods and implements, a routing system, the training of functional foremen or teachers, and in many cases instruction cards, slide-rules, etc. (Referred to later in rather more detail on page 129.) The necessity for systematically teaching work- men how to work to the best advantage has been several times referred to. It seems desirable, there- fore, to explain in rather more detail how this teach- ing is done. In the case of a machine-shop which is managed under the modern system, detailed written instructions as to the best way of doing each piece of work are prepared in advance, by men in the planning department. These instructions represent the combined work of several men in