It is likely that future scholarship on U.S. welfare reform will take Grogger-Karoly as the starting point, view it as the definitive assessment of the state of the art, and use it as a springboard for future research. Scholars who want to assemble and assess evidence on the effects of policy changes in other policy arenas will want to consult this work as an exemplar of how to do it well.
   --Robert Plotnick, University of Washington

This is an excellent book – comprehensive, well organized, and clear. It will be a widely cited and used reference in the welfare policy research community.
   --Hilary Hoynes, University of California, Davis

Jeffrey T. Grogger is Irving Harris Professor in Urban Policy, Harris School of Public Policy, University of Chicago.

Lynn A. Karoly is Senior Economist, RAND Corporation.