This study assessed the effectiveness of a cognitive intervention treatment program for juvenile offenders, which is called the Juvenile Cognitive Intervention Program. The program was provided to incarcerated delinquents at three juvenile correctional facilities in Wisconsin. The results indicated that using the How I Think (HIT) Questionnaire as a measure of change, significant improvement in reducing cognitive distortions were found across age groups and gender, and included individuals who were unable to successfully complete the program the first time and then completed it successfully. The HIT is a measure of cognitive distortions that are associated with delinquent thinking patterns and behavior. Cognitive change is a major focus of treatment programs in juvenile corrections as there has been substantive research demonstrating a link to reduced delinquent and later criminal behavior.