Describes a cognitive-behavioral program for substance abusers. In addition to conventional drug and alcohol information, the program emphasized cognitive and behavioral skills which can prevent substance abuse, including training in consequential thinking, and stress and anger management. Over a 2-yr period, 607 men and 131 women were served, of whom 429 completed the entire program. Both men and women showed significant improvement from pretest to posttest in all knowledge areas. Inmates gave high ratings to the program, and group leaders reported substantial change in client attitudes toward drug and alcohol use. Knowledge scores at the end of the program were highest for those who scored higher at pretest, rated their group leader higher, and were rated by their group leader as more active participants. Client participation was the strongest predictor of program outcome. (PsycINFO Database Record (c) 2016 APA, all rights reserved)