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We argue that the treatment of trans‐subsystem change, and particularly the role of public opinion in fostering such change, within the Advocacy Coalition Framework (ACF) has been underspecified. We propose a model of “policy topography” that combines the concepts of public opinion, clusters of linked subsystems, and policy issue venues. While the ACF has characterized subsystems as relatively self‐contained, we argue that they are more usefully understood as operating in a relatively permeable fashion among evolving clusters of subsystems linked together by networked relations, strategically overlapping policy considerations, and public opinion disruptions. The “policy topography” model offers opportunities to assess the relationships across policy subsystems, and to better specify the critical relationship between public policy and mass opinions. We offer examples, and suggest hypotheses along with …