“The engineer must be able not only to design, but to execute. A draftsman may be able to design, but unless he is able to execute his designs to successful operation he cannot be classed as an engineer. The production engineer must be able to execute his work as he has planned it. This requires two qualifications in addition to technical engineering ability: He must know men, and he must have creative ability in applying good statistical, accounting, and " system" methods to any particular production work he may undertake.”

—  Hugo Diemer

Source: "Industrial Engineering," 1905, p. 67

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Hugo Diemer9
American mechanical engineer 1870–1937

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