Peter's principle, also known as the upward climbing principle, is a conclusion drawn by American scholar Lawrence Peter based on the analysis of thousands of incompetent failures in relevant organizations, that is, in various organizations, because they are used to promoting people who are competent at a certain level, employees always tend to be promoted to their incompetent position.
According to the above definition, the statement 'Oakman is an outstanding technician at Lyme Auto repair Company. When the company promoted him to executive director, he was very busy, tired and unfulfilled every day' conforms to Peter's principle.