This report summarizes the findings of a study of the effects of home environment on child outcomes as influenced by the Infant Health and Development Program, an intervention aimed at improving the health and development of premature, low birth weight infants through parental education and support and enriched educational day care and health services for children. Participating in the longitudinal study were 985 low birth weight infants assessed from birth to age 3, with follow-up assessment conducted at ages 5 and 8. Among the major findings of the study are that the intervention made a bigger difference on IQ scores for children from lower quality home environments than for children from higher quality home environments when children were age 3, but not when they were 5 or 8 years old. The impact of the intervention on children's measured intelligence did not persist beyond age 3, regardless of the quality of the home environment. There was no evidence of a treatment effect on children's behavior problem scores at any assessment. Nor did the quality of the home environment interact with the treatment group status to affect the number of behavior problems reported by mothers. (KB)