Knowledge has to be improved, challenged, and Posted on July 10, 2013July 10, 2008 by admin “Knowledge has to be improved, challenged, and increased constantly, or it vanishes.” — Peter Drucker Author: Peter Drucker Category: knowledge Tags: knowledge, Peter Drucker Spread the love Related posts: Today knowledge has power. It controls access A manager is responsible for the application Checking the results of a decision against Scientific knowledge is a kind of discourse.