A Top Executive Job Never Comes with a Roadmap

Most people are promoted to positions of leadership based on their accomplishments as an individual contributor. As they continue to move up the ranks through the years that follow, absent any significant focus on developing themselves as leaders, their outmoded tactics and strategies for “leading” become liabilities—or at least fail to act as the assets they could be—and their performance is less than stellar. Call it the law of self-inflicted diminishing returns.
http://leadershipunleashed.typepad.com/leadership/2009/02/a-top-executive-job-never-comes-with-a-roadmap.html