Ancona (management, MIT's Sloan School of Management) and Bresman (organizational behavior, INSEAD) show how traditional, inward-looking team models fall short in today's business environment, and describe a model for a new type of externally focused team, the X-team, with a flexible membership and leadership structure that can adapt to changes in markets, technologies, and competition. They give examples of X-teams, and examine forward-looking companies that have established specific programs, incentives, and processes to create and maintain them. Managers at all levels in any organization in which teams are important will find the book useful. Annotation ©2007 Book News, Inc., Portland, OR (booknews.com)