Program Summary Program Description Evaluation Outcomes Evaluation Methodology Cost Implementation Information Other Information (Including Subgroup Findings) Evidence-Base (Studies Reviewed) Additional References Related Practices Why might a practice's outcome ratings differ from the ratings of specific programs encompassed by that practice? Rating Process Learn how this and other programs are rated. Program Snapshot Date Modified: September 4, 2020 In 2020, a rereview of the study by Webster-Stratton and colleagues (2004), and a study by Webster-Stratton and colleagues (1997), resulted in a final program rating of Effective. Date Created: June 19, 2011