Prior to the transition to the current multi-method data collection methodology featuring Job Incumbent, Occupational Expert, Big Data, and other sources, the O*NET databases from O*NET 98 to O*NET 4.0 were populated using data supplied by occupational analysts. Using earlier occupational taxonomies, analysts evaluated and refined existing Dictionary of Occupational Titles (DOT) data, then extrapolated these data to the O*NET Content Model. See:
Researchers conducting longitudinal data studies are strongly encouraged to use the O*NET 5.0 database as a starting point.
Release of the final 'Analyst Database' with a revised database structure consistent with the OMB-approved Data Collection Program
Data Dictionary: PDF
Database classification converted to conform to the new Standard Occupational Classification (SOC) standard
Release of the original 'Analyst Database' based on the Occupational Employment and Wage Statistics (OEWS) classification