Part I, "Impact on Population," addresses the key factors that underlie the prison population increase in Illinois and explains why this trend is expected to continue. Tables and figures show an increase in the murder, class X, and class 1 as well as violent offender populations that have resulted from determinate sentencing. The impact of life, death, and sexually dangerous-person sentences on the inmate population can also be observed. Also, the changing Habitual Offender, Habitual Child Sex Offenders, Guilty But Mentally Ill, and enhanced Class X populations are presented. Part II, "Length of Stay," notes the time inmates are serving in prison. In addition, the pace of releasing inmates sentenced under indeterminate sentencing is shown. The impacts of policy changes and new legislation are indicated as well. Part III, "Sentences Imposed," provides the data for determinate and indeterminate sentencing patterns since 1984. The number of extended, shortened, and consecutive sentences are reported by offense. Average sentences for the major offenses are presented by judicial circuit and district, and geographic region. 57 tables and 34 figures