Two Harvard Business School professors (one current, one former) explain how calamitous events often catch leaders off guard despite prior awareness of the information necessary to anticipate them. Through an examination of well-known disasters such as the Enron debacle, the authors identify six warning signs that precede "predictable surprises" and explore the cognitive, organizational, and political biases that immobilize leaders. They then offer suggestions for overcoming these biases and building support for preventative action. Annotation ©2004 Book News, Inc., Portland, OR (booknews.com)