The document discusses state-level data needs for estimating the impact of national health reform. It outlines opportunities and challenges for states in developing estimates of newly insured populations under reform. Key points include: (1) States need estimates for implementing coverage expansions and meeting federal reporting requirements. (2) Existing national estimates provide limited state-level data. (3) States are using surveys and models to generate customized estimates, drawing on available federal and state data sources. (4) Developing accurate, timely estimates presents challenges around resources, flexibility and uncertainty.