Which is the stronger correlate of school learning? Time to learn or measured intelligence?

Time to learn (TTL; measured by the number of trials to criterion on single units of material from 6 academic areas) and intelligence (measured by the Lorge-Thorndike Intelligence Test) were correlated with each other and with school achievement (measured by standardized test scores) in a study of 153 4th, 5th, and 6th graders. TTL was a strong correlate of school achievement (.85-.89). Correlations were lower between TTL and IQ (.50-.69) and between IQ and achievement (.59-76). It is concluded that TTL is a stronger correlate of school learning than IQ is. TTL is discussed as a tool for teachers who design individual instruction and as potentially the fairest measure of school performance available at the present time. (15 ref)