Integrating evaluation into an Extension program offers multiple opportunities to understand program success through achieving program goals and objectives, delivering programming using the most effective techniques, and refining program audiences. It is less common that evaluation is used to guide and validate the effectiveness of program revision. Early evaluation results from Utah Master Naturalist Watersheds classes were used to make specific, targeted program revisions, and significant increases in recent evaluation results validated that the revisions were successful. Using evaluation in this way conserves time, effort, and resources, and helps achieve a high level of program success expected from Extension professionals.