In this paper, we explore whether the specific design of a state's program has contributed to its success in meeting two objectives of the Children's Health Insurance Program (SCHIP): increasing the health insurance coverage of children in lowerincome families and doing so with a minimum reduction in their private health insurance coverage (crowd-out). In our analysis, we use two years of Current Population Survey data, 2000 and 2001, matched with detailed data on state programs. We focus on two populations: the eligible population of children, broadly defined—those living in families with incomes below 300 percent of the federal poverty line (FPL)—and a narrower group of children, those who we estimate are eligible for Medicaid or SCHIP. Unique state program characteristics in the analysis include whether the state plan covers families; whether the state uses presumptive eligibility; the number of months without private coverage that are required for eligibility; whether there is an asset test; whether a face-to-face interview is required; and specific outreach activities. Our results provide evidence that state program characteristics are significant determinants of program success. © 2005 by the Association for Public Policy Analysis and Management