First published in 1939, the Dictionary of Occupational Titles (DOT) groups jobs based on their similarities and defines the structure and content of all listed occupations. The Revised Fourth Edition is the result of ten years of research and verification by job analysts across the nation. Each occupational definition systematically presents the following seven basic parts: an occupational code number, a title, an industry designation, alternate titles, a body of text including a lead statement, task statements, glossary words, and reference titles, undefined related titles, and a definition trailer. The occupational code number and the definition trailer provide data about a particular job's skill requirements, specific vocational training requirements, and year last reviewed by an occupation analyst.
