Results indicate that since not all psychopaths are the same, they should be treated and managed using differential treatment models. A sample of 95 male inmates from 3 medium security prisons were tested using the Hare Psychopathy Checklist: Screening Version (PCL: SV). Using traditional criteria, 22 percent of the inmates were classified as psychopaths. Scores on the two factor dimensions for the PCL: SV were then used to develop a four-way classification system. Inmates who tested in the fourth quadrant had few job skills, no history of violence, a prison record reasonably clear of infractions, and showed very little manipulative behavior. This group would profit from job-skills training and social skills development. Inmates who tested in the third quadrant were aggressive and used violence, but lacked the callous indifference to others, and generally got along well with other inmates, although other inmates were leery of them because of their quick temper. This group would benefit from anger management training followed by relapse prevention training to redirect their behavior. The second quadrant group was the most dangerous, the most difficult to manage, and presented the greatest risk for reoffense. This group required close supervision and prompt feedback from a well-structured environment to prevent destructive behavior. Inmates in the first quadrant were the persistently manipulative schemers who focused on short term gain; criminals who ignored the rules and attempted to manipulate others either to gain advantage or to get themselves out of trouble. Inmates in this model would be unmotivated to engage in treatment of any sort, except for short term gain. Treating all psychopaths alike could potentially obstruct those who might be treatable. Better information would enable forensic professionals, managers, and decisionmakers an ability to provide more effective assessment, treatment, and management of incarcerated psychopaths. Tables, references