„Attainment not only depends on cognitive skills, but also on noncognitive traits (e. g. conscientiousness, perseverance, or self-control) that children from higher social backgrounds are better equipped with.“
Dr. Jan Paul Heisig u. a., Cross-national differences in social background effects on educational attainment and achievement. In: Compare, 2020, Vol. 50, No. 2, S. 167.