Information on disciplinary records and intelligence tests of 8,336 inmates was available for analysis. Primary sources used to collect data about the sample included warden's cards and Department of Corrections (DOC) files. Information on intelligence test scores was obtained from DOC files. Inmate careers were categorized according to early, middle, or late stages and as disruptive or nondisruptive. Findings suggested that, throughout most of the incarceration period, the disciplinary involvement of mentally retarded inmates was not significantly higher than that of nonretarded peers. Further, mentally retarded inmates were not significantly overrepresented in disruptive adjustment patterns compared to nonretarded peers. The early starter pattern (high disciplinary rate in the first stage and low rate in the final stages) was the most common pattern displayed by disruptive inmates. Chi square statistical analysis revealed no statistically significant relationship between intelligence and adjustment patterns. The author discusses the importance of early intervention to prevent the development of disruptive careers. 25 references, 3 notes, 3 tables, and 4 figures