The Peter Principle Home
The Peter Principle is a special case of a ubiquitous observation: anything that works will be used in progressively more challenging applications until it fails. This is "The Generalized Peter Principle." It was observed by Dr. William R. Corcoran in his work on Corrective Action Programs at nuclear power plants. He observed it applied to hardware; e.g., vacuum cleaners as aspirators, and administrative devices such as the "Safety Evaluations" used for managing change. There is much temptation to use what has worked before, even when it may exceed its effective scope. Dr. Peter observed this about humans.In an organizational structure, the Peter Principle's practical application allows assessment of the potential of an employee for a promotion based on performance in the current job; i.e., members of a hierarchical organization eventually are promoted to their highest level of competence, after which further promotion raises them to incompetence. That level is the employee's "level of incompetence" where the employee has no chance of further promotion, thus reaching his or her career's ceiling in an organization.
The employee's incompetence is not necessarily exposed as a result of the higher-ranking position being more difficult — simply, that job is different from the job in which the employee previously excelled, and thus requires different work skills, which the employee may not possess. For example, a factory worker's excellence in his job can earn him promotion to manager, at which point the skills that earned him his promotion no longer apply to his job.