The model was an experimental design with some of the most difficult inmates as subjects and with an independent research team conducting the evaluation. The major specifications of the model were met at Butner. It was clearly demonstrated that a group of sophisticated, dangerous, and experienced criminals can be housed in prisons where a central management philosophy emphasizes individual rights and can function very well under these circumstances. Further, the institution was perceived by the staff and inmates as being positive; there was more active program participation among Butner research inmates than among control group inmates; and, a safer environment was provided for both staff and inmates. A comprehensive followup study revealed no marked differences between experimental and control inmates. 1 table, 4 footnotes, and 10 references (Author abstract modified)