This project will use the SNACC project (a data linkage project conducted by SHADAC, NCHS, AHRQ, ASPE, CMS, and Census) as a platform for identifying the most useful set of next-generation data linkage projects for the purpose of informing health care reform implementation. The project will identify the barriers to creating these data sets, including current limits on data access, and evaluate whether the challenges and shortfalls created by these barriers outweigh the value added. This analysis will be conducted through interviews with technical staff who work with these data and key outside researchers and analytic staff who directly inform policymakers.