The C-suite has become the hot seat. With CEOs under enormous pressure to deliver the outstanding performance investors demand—and to satisfy other, often conflicting constituencies—it is no wonder that the pace of CEO turnover is accelerating. The latest Booz Allen Hamilton CEO succession study found that 15.3% of CEOs worldwide and 16.2% in North America left office in 2005. That’s an increase since 1995 of 70% globally and 54% in North America. What’s more, a third of the departures in the most recent survey were “nonroutine”—that is, they occurred before the scheduled succession date, usually because of performance problems.

A version of this article appeared in the January 2007 issue of Harvard Business Review.