In this article, we trace the evolution of punctuated equilibrium theories of the policy process to the development of a full theory of government information processing. Noting that punctuated equilibrium is one realization of a larger theory of government information processing, we outline a research agenda for the study of agenda setting, policy dynamics, and information flows in the policy process. In doing so, we relate the study of government information processing to such important features of American government as inter‐institutional dynamics and delegation in the policy process.

Policy scholars generally agree that greater coherence of policies is desirable, but the concept is under-theorized and has received little empirical examination. This research examines the policy coherence of 18 policy domains and considers institutional factors that affect variation among them. There is considerable variation in coherence among substantive, regional, and identity-based policy domains. Greater degrees of policy coherence exist for policy domains that have dominant congressional committees or have more involvement of lead federal agencies. These findings extend what policy scholars know about policy subsystems in American policymaking to consideration of the coherence of policy domains.

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We address theoretical and empirical aspects of policy disruptions that affect multiple areas of policymaking. Our theorizing leads us to consider the effects of widespread disruptions in gaining the attention of elected officials, in affecting policymaking, and in reshaping the involvement of federal agencies. Our empirical analyses concern the threat of terrorism in the United States and its implications for public risk subsystems over the past 25 years. Our analyses of the attention of policymakers and resultant policymaking volatility show selective patterns of subsystem disruption related to the threat of terrorism. We show that capturing the attention of policymakers in multiple subsystems is insufficient to motivate heightened levels of policymaking across the board. In addition, we find more muted impacts for federal agency involvement than might have been expected from the massive reorganization that created the Department of Homeland Security. More generally, the disjunctions we observe show the powerful influence of policy subsystems in buffering against widespread policy disruptions.

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