The eight articles on the governance of communicable disease control in Europe in this issue contribute information and insight to the literature on health politics, policy, and law. Each is a carefully researched and well-argued analysis of a subject on which its authors are experts. The set will be useful to scholars of comparative health policy as well as to specialists in European affairs. The articles also illustrate two methodological issues in conducting research on the governance of health policy. The first is that how researchers define governance influences what evidence they acquire and how they evaluate it. The second is that governance affects how diseases are conceptualized in order to make and implement policy.