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Up until the implementation of official standards, prison officials had little assistance in gauging the quality of their facility or the performance of their staff. In the late eighteenth century, the Philadelphia Prison Society constructed guidelines for the treatment of prisoners that included the separation of male and female inmates, the separation of children from adults, the implementation of a classification system, and the basics of prison industry. More recommendations and reforms followed. In 1870, the American Prison Association published its guidelines as the Declaration of Prin-ciples. Since that time, numerous commissions and councils have addressed the requirements of modern penal institutions and have developed model legislation, programs, and standards.