When a subject becomes totally obsolete we make it a required course. My greatest strength as a consultant is to be ignorant and ask a few questions. Don't try to innovate for the future. There is nothing so useless as doing efficiently that which should not be done at all.
Business has only two basic functions-marketing and innovation.
Scroll down for sources of quotations and special search engines. See also CQ's recommended links to biographical websites Drucker Search the Web. Louis E. Boone, 1992.