The Principles of Scientific Management

132 THE PRINCIPLES OF SCIENTIFIC MANAGEMENT from one-fourth to one-third of the men in the employ of the company have been changed from the old to the new, very rapid progress can be made, because at about this time there is, generally, a complete revolution in the public opinion of the whole estab- lishment and practically all of the workmen who are working under the old system become desir- ous to share in the benefits which they see have been received by those working under the new plan. Inasmuch as the writer has personally retired from the business of introducing this system of manage- ment (that is, from all work done in return for any money compensation), he does not hesitate again to emphasize the fact that those companies are indeed fortunate who can secure the services of experts who have had the necessary practical experience in introducing scientific management, and who have made a special study of its principles. It is not enough that a man should have been a manager in an establishment which is run under the new principles. The man who undertakes to direct the steps to be taken in changing from the old to the new (particularly in any establishment doing elab- orate work) must have had personal experience in overcoming the especial difficulties which are always met with, and which are peculiar to this period of transition. It is for this reason that the writer expects to devote the rest of his life chiefly to try- ing to help those who wish to take up this work as their profession, and to advising the managers and