The National Institute of Corrections (NIC) funded projects to assist ten states with the revalidation of their external objective classification systems that determine which facility an inmate should be housed. The ten participating states included Delaware, Montana, Oklahoma, Oregon, Rhode Island, Tennessee, Texas, Virginia, Wisconsin, and Wyoming. Written by Patricia L. Hardyman, James Austin, and Owan C. Tulloch, this 146-page report reveals the work undertaken by the participating states, provides an overall outline of the essential tasks required for revalidation, and summarizes external classification trends along with the lessons learned from these reforms. The report also includes copies of classification instruments and statistical tables to describe options for other states faced with similar problems.