The Dictionary of Occupational Titles was published by the Department of Labor until 1991. It has been replaced by the Occupational Information Network (O*NET), but the DOT in its original and privately expanded versions is still useful. The first six digits of the DOT occupational code can be represented by the alphabetical initials CDG (category, division, group) and DPT (data, people, things). The numbers help the counselor determine transferable skills and the levels at which they have worked.