Occupational Standing and Occupational Stratification by Cognitive Ability

There is a popular psychometric thesis suggesting that people with different levels of cognitive ability end up in different occupations because some occupations require greater intelligence than others for successful performance. To examine several central claims of the psychometric thesis, this study uses two kinds of data for analysis: one is cross-sectional and occupation-level data from various sources dated as early as World War I and the other is longitudinal and individual-level data from the National Longitudinal Survey of Youth 1979 Cohort (NLSY79) and the Wisconsin Longitudinal Study (WLS) in the United States. Findings of this study suggest that occupational segregation by cognitive ability is much less intensive than that suggested by the psychometric theory, and there is no evidence of a trend of increasing cognitive partitioning by occupation over time.