| Summary: | The Project on Human Development in Chicago Neighborhoods (PHDCN) was a large-scale, interdisciplinary study of how families, schools, and neighborhoods affect child and adolescent development. One component of the PHDCN was the Longitudinal Cohort Study, which was a series of coordinated longitudinal studies that followed over 6,000 randomly selected children, adolescents, and young adults, and their primary caregivers over time to examine the changing circumstances of their lives, as well as the personal characteristics, that might lead them toward or away from a variety of antisocial behaviors. Numerous measures were administered to respondents to gauge various aspects of human development, including individual differences, as well as family, peer, and school influences. Traditionally, the Stanford-Binet (SB) Intelligence Scale was a wide-range individual test, assessing intelligence from age two through the superior adult level. It was an age scale, requiring subjects to solve problems, give definitions, memorize new material, and use some visual-motor skills at various age levels. For this study, the SB included a vocabulary subtest consisting of providing both names of pictures and definitions of words. It was only administered to Cohort 3.
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