The correct assumption is that what individuals have learned by age twenty-one will begin to become obsolete five to ten years later and will have to be replaced-or at least refurbished-by new learning, new skills, new knowledge.
Peter DruckerProgress is obtained only by exploiting opportunities, not by solving problems. When you solve problems, all you do is guarantee a return to normalcy.
Peter DruckerThe most efficient way to produce anything is to bring together under one management as many as possible of the activities needed to turn out the product.
Peter Drucker