From the Ask Tom mailbag-

Question:
When I read this article, I think about Timespan and you. I hope this quote is not accurate.

“In a hierarchy every employee tends to rise to his or her level of incompetence. Work is accomplished by those employees who have not yet reached their level of incompetence. In time, every post tends to be occupied by an employee who is incompetent to carry out its duties.”

Response:
Sadly, this is true. We tend to promote people to a level of incompetence, and then hope and pray. This understanding was popularized in a book by Lawrence J. Peter published in 1969, called the Peter Principle. The Peter Principle is alive and well.

The solution to this dilemma is easy. From now on, no one in your organization gets a promotion. They earn promotions (or even lateral moves) by demonstrating competence in the task assignments contained in the new role. You test people with project work. And, in that project, you must embed decision making and problem at that next higher level. The same goes for a lateral move where there is a new skill set.