This article examines the policymaking roles and interactions of governors, legislators, administrators, and lobbyists in state politics. It analyzes their policy involvement in terms of whether they fit a conceptual model of subsystem politics. These data are compared to various policy outcome measures of four state governments in the issue area of aging; Florida, Iowa, Michigan, and New Jersey. While the policy data from some states is suggestive of those results postulated in subsystem theory, the patterns of institutional involvement and interaction vary widely. All, however, suggest more clustered, rather than encompassing, patterns of influence and participation within this policy area.Research on the &dquo;neglected world&dquo; of state politics (Jewell, 1982) suffers from, among other things, a lack of attention to institutional relationships. As a result, political scientists know very little about the relative influence of various state-level political participants on policy outcomes. This study examines how relationships between policymakers, each carrying out their own institutional responsibilities, have been structured.The analysis takes a subsystem, or subgovernment, approach in that its intent is to determine the degree to which policyrelevant interaction is either restrictively clustered or generally open to an expanding number of participants. Subsystem expla-Aurhors Note: This study owes a great deal to Laurily Keir Epstein who collaborated on data gathering and the initial drafts of this article and other project papers. Thanks go to her and Myrna Froning, who helped gather the Iowa data. I am also indebted to