The Peter Principle document discusses the work and ideas of Laurence J. Peter, a Canadian teacher and author best known for his 1969 book The Peter Principle. The central thesis of Peter's book is that "in a hierarchy, every employee tends to rise to his level of incompetence." Specifically, the Peter Principle observes that employees are promoted up through an organization's hierarchy until they reach a level at which they are no longer competent to perform the duties of their new role. As a result, each position in the hierarchy will eventually be filled by an employee who is incompetent for that job.