This paper examines successes and shortcomings of the State Children's Health Insurance Program (SCHIP). SCHIP is a source of coverage for millions of children, improving their access to health care and sparking innovation in program design and improvements in Medicaid. However, SCHIP adds to the complexity of the insurance system and introduces new inequities in access to insurance; it is imperfectly targeting eligible children who are uninsured; and its financing is problematic because of the block-grant funding structure and use of SCHIP funds to cover adults. These issues need to be addressed during the SCHIP reauthorization process.