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. One of the measures composing the Longitudinal Cohort Study was the Home Observation for Measurement of the Environment (HOME) inventory. The HOME inventory sought to observe the developmental environment in which children belonging to the Longitudinal Cohort Study sample were raised. The HOME inventory was designed to capture the absence or presence of certain cognitive stimuli, including varied learning experiences and diverse educational materials. The HOME inventory also measured the extent and nature of the interactions that occurred between the subject and his or her primary caregiver, the subject and the subject's father (if the father was not the primary caregiver), and the subject and other family members. The PHDCN version of the HOME inventory also assessed the physical conditions in and around the respondent's home, taking careful note of the layout of the streets and buildings comprising the neighborhood.