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The theory that employees within an organization will advance to their highest level of competence and then be promoted to and remain at a level at which they are incompetent.
[After Laurence Johnston Peter (1919-1990).]
the Peter Principle the theory, usually taken facetiously, that all members in a hierarchy rise to their own level of incompetence
[C20: from the book The Peter Principle (1969) by Dr. Lawrence J. Peter and Raymond Hull, in which the theory was originally propounded]
a satirical observation that in any organizational structure people tend to be promoted until they reach their level of incompetence.
[from the title of a book by Laurence J. Peter (b. 1919), Canadian educator]