Occupational changes during the 20th century.

The article focuses on changes in occupational staffing patterns in the United States during the 20th century. Professional, managerial and clerical workers grew from one-quarter to three-quarters of total employment between 1910 and 2000. There had been a shift in the workforce once composed mostly of manual workers. Occupational staffing patterns changed radically over the 1910-2000 period in response to changes in the mix of goods and services produced and the methods used to produce them.