In 1832 Charles BabbageOffsite Link published On the Economy of Machinery and Manufactures, the first work on operations research, partially based on data he had accumulated during the previous ten years in order to build his Difference EngineOffsite Link No. 1. Primary themes of the book were the division of labor and the division of mental labor, to which Babbage devoted chapters 19 and 20. The first part of his chapter on the division of mental labor was an analysis of the methods used by de Prony in the production of his celebrated mathematical tables, and the third and fourth editions included in section 249 a small table calculated by the completed portion of the Difference Engine No. 1.