The report, prepared by Abt Associates for the Department of Justice's Bureau of Justice Statistics (BJS), examines patterns of federal sentencing disparity among white and black offenders, by sentence received, and looks at judicial variation in sentencing since Booker v. United States. The report summarizes U.S. Sentencing Guidelines, discusses the methodology and how approaches of other researchers to the study of sentencing practices differ from this approach, and defines disparity as used in this study.  Find more information on the BJS publications page.