Pollock and coauthors made three key contributions to Communitycommunity Structurestructure Theorytheory. First, they conducted among the first US nationwide and cross-national studies using the community structure model, comparing multiple large metropolitan areas and countries, expanding study sample sizes beyond a focus on one or two cities. Second, Pollock et al. also evolved the theory to include a Media Vector methodological tool for measuring both content direction and editorial prominence of articles, then combining them into a single score, thereby adding a way to consider editorial evaluation as well as article content. Third, Pollock and coauthor findings often challenged the traditional “guard dog” hypothesis by concluding that media can often reflect the interests of more vulnerable stakeholders. <ref name=":1" /> Community structure studies are related to work focusing on the roles of social capital (in political science and sociology literatures) and social determinants of health (in health communication and public health literatures). In 2013, Pollock authored an authoritative annotated bibliography on Community Structure scholarship for Oxford Bibliographies Online. <ref name=":2" />
