3. This knowledge is to be had _now_. The men who have it are ready and glad to impart it to all who are interested and who will pass it on.[5] The text books are at hand now. The opportunities for practical experience in Scientific Management will meet all demands as fast as they are made. 4. The psychology of, that is, the mind's place in management is only one part, element or variable of management; one of numerous, almost numberless, variables. 5. It is a division well fitted to occupy the attention of the beginner, as well as the more experienced, because it is a most excellent place to start the study of management. A careful study of the relations of psychology to management should develop in the student a method of attack in learning his selected life work that should help him to grasp quickly the orderly array of facts that the other variables, as treated by the great managers, bring to him. PURPOSE OF THIS BOOK.--It is scarcely necessary to mention that this book can hope to do little more than arouse an interest in the subject and point the way to the detailed books where such an interest can be more deeply aroused and more fully satisfied. WHAT THIS BOOK WILL NOT DO.--It is not the purpose of this book to give an exhaustive treatment of psychology. Neither is it possible in this book to attempt to give a detailed account of management in general, or of the Taylor plan of "Scientific Management" so-called, in particular. All of the literature on the subject has been carefully studied and reviewed for the purpose of writing this book,--not only what is in print, but considerable that is as yet in manuscript. No statement has been made that is not along the line of the accepted thought and standardized practice of the authorities. The foot notes have been prepared with great care. By reading the references there given one can verify statements in the text, and can also, if he desires, inform himself at length on any branch of the subject that especially interests him. WHAT THIS BOOK WILL DO.--This book aims not so much to instruct as to arouse an interest in its subject, and to point the way whence instruction comes. If it can serve as an introduction to psychology and to management, can suggest the relation of these two fields of inquiries and can ultimately enroll its readers as investigators in a resultant great field of inquiry, it will have accomplished its aim. DEFINITION OF MANAGEMENT.--To discuss this subject more in detail-- First: What is "Management"? "Management," as defined by the Century Dictionary, is "the art of managing by direction or regulation." Successful management of the old type was an art based on no measurement. Scientific Management is an art based upon a science,--upon laws deducted from measurement. Management continues to be what it has always been,--the _art_ of directing activity.