The revised fourth edition of the Dictionary of Occupational Titles was produced by the U.S. Employment Service under the direction of Robert A. Schaerfl, Director. The Occupational Analysis Program was directed by Clay Cottrell, Chief, Division of Planning and Operations. Coordination and technical supervision of the data collection effort was directed by John Hawk, Personnel Research Psychologist, with additional technical planning and support from Russ Kile and Donna Dye of the OA unit.

The new data for this edition were developed through the efforts of the following Occupational Analysis Field Centers, operated through the State Employment Services: Boston, Massachusetts, Paul Cleary, Supervisor; Detroit, Michigan, Tom Kearney, Supervisor; St. Louis, Missouri, Doris Phelan, Supervisor; Raleigh, North Carolina; and Salt Lake City, Utah, Barbara Smith, Supervisor. Grateful acknowledgement is also made for the contribution of Jerome Stevens and Bessie Kuhn, former Supervisors of the Missouri Field Center.

The North Carolina Occupational Analysis Field Center served a pivotal role in the planning, collection, preparation, and technical review of data for this revised edition, as well as its computerization and publication. Special recognition is due the staff of that center, including Mike Swaim, Bruce Paige, Larry Patterson, and Sammie Batchelor, and to their Supervisor, Stanley Rose.

Space does not permit a listing of their names, but grateful acknowledgement is also given to those associations, business firms, labor organizations, other Federal Agencies, and individuals whose assistance and cooperation contributed significantly to the development of this publication.