Since its inception, the Dictionary of Occupational Titles (DOT) has provided basic occupational information to many and varied users in both public and private sectors of the United States economy. This revised Fourth Edition of the DOT appears at a time when there is growing recognition of the need for lifetime learning, when rapid technological change is making the jobs of current workers more complex than they were even a few years ago, and when timely and accurate labor market information is an increasingly important component of personal and corporate decision-making.

Publication of this document reaffirms in the clearest way the Department's continuing commitment to assist jobseekers, employers, educational and training institutions, researchers, and other interested parties with the most current and accurate occupational information possible. I hope that publication of this revised Fourth Edition will constitute a public service as timely and valuable as was publication of its predecessor volumes.

LYNN MARTIN
Secretary of Labor