James Heckman is a Nobel Prize-winning economist at the University of Chicago whose research on human capital development has profoundly shaped how economists and policymakers think about education and early intervention. One strand of his work has direct and underappreciated relevance for school admissions: his documentation of the independent predictive power of non-cognitive skills.
In a widely cited 2006 paper published in the Journal of Labor Economics, Heckman, Stixrud and Urzua analysed data from a large longitudinal study tracking individuals from adolescence through adulthood. Their analysis found that both cognitive ability and non-cognitive traits, including measures related to self-regulation, perseverance, and motivational orientation, independently predicted outcomes across education, employment, health, and social behaviour.
The key finding was independence. It was not simply that students who scored well on cognitive tests also tended to have better non-cognitive profiles. The two dimensions contributed separately and additively to long-term outcomes. High cognitive ability with poor non-cognitive development predicted worse outcomes than equivalent cognitive ability paired with strong non-cognitive skills. And for individuals with moderate cognitive scores, non-cognitive factors were particularly powerful predictors of whether they went on to succeed academically and professionally.
The Perry Preschool Project
Heckman's analysis of the Perry Preschool Project, a randomised controlled trial that provided high-quality early education to disadvantaged children in 1960s Michigan, offers some of the most compelling evidence for the importance of non-cognitive development. The project followed participants for decades.
Initial hopes that the programme would produce lasting gains in measured IQ were not sustained: cognitive test score gains faded over time. But the long-term outcomes for participants were substantially better than for the control group across multiple dimensions: higher rates of high school graduation, higher employment and earnings, lower rates of criminal conviction.
When Heckman and his colleagues examined why, they found that the lasting effects were operating primarily through non-cognitive pathways. The programme had developed children's attention, persistence, and social competence in ways that carried forward through their education and into adult life, even after measured cognitive gains had dissipated.
What this means for school admissions assessment
The Heckman research does not argue that cognitive ability is unimportant, it clearly is not. It argues that cognitive ability is an incomplete picture of a student's likely trajectory. A student with strong academic scores but poor self-regulatory development is a different admissions risk profile from a student with the same academic scores and strong motivation and persistence.
For schools making admission decisions at Grades 3-10, the period when non-cognitive skills are still developing and when school environment has the most influence on their trajectory, this matters in two ways. First, a contextual signal about a student's approach to challenge and learning is genuinely informative about their likely performance in the school's programme. Second, it provides information about what kind of support or environment this student needs to develop well.
The challenge is that non-cognitive assessment in admissions must be transparent, structured, and clearly positioned as contextual rather than decisive. The Heckman research provides the justification for including it. The design of how it is assessed and used requires careful attention to the concerns about gaming and interpretation that any self-report instrument raises.
Sources: Heckman, J. J., Stixrud, J., and Urzua, S. (2006). The effects of cognitive and noncognitive abilities on labor market outcomes and social behavior. Journal of Labor Economics, 24(3), 411-482. Heckman, J. J. (2006). Skill formation and the economics of investing in disadvantaged children. Science, 312(5782), 1900-1902.
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