Over live past two decades the social sciences in the United States have experienced a remarkable period of methodological enrichment. Numerous advances in statistics, in formal modeling, in computation, and in data collection have fueled this happy methodological surge. Substantively. demography, network analysis, event history and a number of other quite generalized analytic perspectives have revised the ways we can describe and account for change, and have made the social sciences powerfully relevant to policy in a way they were not only a while ago.