We analyze the role of newly integrated data from the child support and child welfare systems in seeding a major policy change in Wisconsin. Parents are often ordered to pay child support to offset the costs of their children’s stay in foster care. Policy allows for consideration of the “best interests of the child.” Concerns that charging parents could delay or disrupt reunification motivated our analyses of integrated data to identify the impacts of current policy. We summarize the results of the analyses and then focus on the role of administrative data in supporting policy development. We discuss the potential and limitations of integrated data in supporting cross-system innovation and detail a series of complementary research efforts designed to support implementation. (Author abstract)