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This figure is constructed by pairing the selected DOT 1977 task measures with Census and CPS employment data for each decade. By construction, each task variable has a mean of 50 centiles in 1960. Subsequent points depict the employment-weighted mean of each assigned percentile over each decade. 1295

Our data on job task requirements come from the 1977 edition of the Dictionary of Occu- pational Titles (DOT). Our use of DOT measures of task inputs replicates the choices in ALM. To identify variables that best approximate our task constructs, ALM reduced the DOT variables to a relevant subset using DOT textual definitions, means of DOT measures by occupation from 1970, and detailed examples of DOT evaluations from the Handbook for Analyzing Jobs. 15

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