tions and the change between years. It employs the NCVS, a large omnibus victimization survey, as a critical tool for accomplishing that mission. Addressing data user questions about its current methodology for measuring the incidence of rape and sexual assault, the BJS sought advice from the National Research Council, which led to the creation of this panel. The panel concludes that “best practices” for measuring rape and sexual assault on BJS household surveys would involve a decoupling of that measurement from the NCVS, and it provided guidelines for making that change. The panel applauds BJS for its openness in addressing these issues and is confident that it can use the analyses and recommendations in this report to move toward continuous quality improvements in measuring these injurious victimizations.