The ingenuity of the average worker is sufficient to outwit any system of controls devised by management. - Douglas McGregor

Human behavior is predictable, but, as in physical science, accurate prediction hinges on the correctness of underlying theoretical assumptions. There is, in fact, no prediction without theory; all managerial decisions and actions rest on assumptions about behavior. If we adopt the posture of the ostrich with respect to our assumptions under the mistaken idea that we are thus “being ‘practical,” or that “management is an art,” our progress with respect to the human side of enterprise will indeed be slow. Only as we examine and test our theoretical assumptions can we hope to make them more adequate, to remove inconsistencies, and thus to improve our ability to predict.

Management cannot provide a man with self-respect or with the respect of his fellows or with the satisfaction of needs for self-fulfillment. It can create conditions such that he is encouraged and enabled to seek such satisfactions for himself, or it can thwart him by failing to create those conditions.

Above all, it is necessary to recognize that knowledge cannot be pumped into human beings the way grease is forced into a machine. The individual may learn; he is not taught.