In 1998 more than 63,800 convicted felons were sentenced in Illinois, which is twice the number sentenced in 1988 and more than four times the number sentenced in 1974. Near-record numbers of convicted felons were sentenced to both probation and prison during 1998, with the number of probation sentences (32,716) outnumbering prison sentences (28,429) statewide. The proportion of felons sentenced to prison increased over the past three decades, while the proportion of felons sentenced to probation decreased. Probation is still the most frequently imposed sanction for felony offenders statewide. Probation is a sentencing option for offenders convicted of Class 1, 2, 3, and 4 felonies. Since 1990, the average length of prison sentences imposed has increased for first-degree murders, Class X, and Class 2 offenses; remained the same for Class 1 and Class 3 offenses; and decreased for Class 4 felonies. Most felons sentenced to prison in Illinois receive credits toward their sentence for good behavior and participation in specific rehabilitative programs. The death penalty has been a sentencing option under strictly defined circumstances since June 1977. A death sentence may be imposed if an offender is convicted of first-degree murder, was at least 18 years of age at the time of the crime, and one or more aggravating conditions existed. Between 1977 and 1998, 293 death sentences were imposed in Illinois. 2 figures and 1 table