The impact of evidence-based training on the level of probation officers’ (POs) knowledge of “what works” in effective interventions and also on the POs’ attitudes about providing better service are examined. This study shows that “the training had an immediate effect on several indicators regarding knowledge of evidence-based correctional practices, belief in self-efficacy regarding offender change (on the part of probation officers), and an increasing awareness of the importance of core correctional practices and the effectiveness of the IBIS [Integrated Behavioral Intervention Strategies] skills ... these changes represent an attitudinal change on the part of the POs who were participating in the training.”