Code sheets for 666 men (a 50 percent sample) and 54 women (a 69 percent sample) were completed for the Uniform Parole Report (UPR) report. Case files for individuals selected for the sample were randomly selected and read over a 3-month period. Each 1977 releasee in the sample was followed-up for a 12-month period following the date of release to parole, less if a violation occurred during the followup period, or if the parolee was discharged from supervision before the end of the followup period. The parole performance for males and females released to parole in 1974, 1975, 1976, and 1977 was analyzed. The findings showed that the total number of males released to parole more than doubled over the 4-year period. The percent of females with a successful outcome increased over the period from 1974 through 1976 but decreased slightly in 1977. The 1977 success rate was, however, 7.3 percent above that for 1974. The relationship between parole performance and the various parole statuses and socioeconomic and other factors was analyzed. For example, parole performance was found to be moderately related to the type of last prior admission for males. Most successful were males admitted as parole violators for infractions of parole rules. For females, new court commitments had a 92.6 percent success rate, compared to probation violations with an 84.6 percent success rate. Success rates were the highest for white males and Native American females. Statistical data are included. A list of parole outcome definitions and of offense categories is appended.