In time I saw that all such cases had a common feature. The employee had been promoted from a position of competence to a position of incompetence. I saw that, sooner or later, this could happen to every employee in every hierarchy.

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The computer may be incompetent in itself — that is, unable to do the work for which it was designed. This kind of incompetence can never be eliminated, because the Peter Principle applies in the plants where computers are designed and manufactured.