reports from teachers in elementary school rating both the treatment and the control children on “personal behavior” and “social development.” The first term tracked how often each student swore, lied, stole, or was absent or late; the second one rated each student’s level of curiosity as well as his or her relationships with classmates and teachers. Heckman labeled these noncognitive skills, because they were entirely distinct from IQ. And after three years of careful analysis, Heckman and his researchers were able to ascertain that those noncognitive factors, such as curiosity, self-control,
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