This article presents the results of research designed to test participatory democracy assertions that high‐quality public participation can affect participants' beliefs in desirable ways. It examines the relationships between exposure to quality participation and participant beliefs about the trustworthiness and responsiveness of a public agency and the value of including different viewpoints in public meetings. After participation in quality project meetings, participants were significantly more likely to believe the agency was responsive to public concerns. The results indicate that some specific aspects of quality participation are positively associated with expectations about the agency's responsiveness and performance. Positive associations were also found with tolerance for differences of opinion. These results have important implications for public administrators and theorists of participatory democracy.