The IIP is an intervention program designed to promote lawful behavior in criminal offenders through a highly structured program of military discipline designed to develop responsibility, self-esteem, and positive self-concept, while also addressing the underlying issues that lead to criminal behavior and substance abuse. On August 1, 1994, a third IIP facility was opened on the DuQuoin State Fairgrounds in southern Illinois. The other IIP facilities are located at Dixon Springs in the Shawnee National Forest in southeastern Illinois and in Greene County in central Illinois. Judges have referred 7,299 offenders to the IIP. Of this number, 4,096 have been admitted to the program. The IIP has been operating at full capacity since January 1991. There are 320 inmates awaiting transfer to the program. Sixty-four percent (2,549 inmates) of all program exits have graduated from the program. Of those graduates who have been released for a 3-year period, 21 percent have returned to prison with a new felony offense compared to an expected recidivism rate for comparable inmates of 34 percent. Since the IIP was implemented in October 1990, nearly $8 million has been saved due to the shorter prison stay of the participants and projected prison crowding has been eased somewhat. In addition to providing a profile of the offenders who have been recommended for the IIP, this report presents a description of inmate activities prior to entry into the program, cost comparisons, and post-program performance. 5 tables, 3 figures, and 18 references