System theories have been applied to a wide spectrum of empirical cases and policy issues. Parsons and his followers, in particular, applied their systems theory to diverse empirical phenomena in sociology as well as in other disciplines: modernization, economics, politics, social order, industrialization and development, Fascism and McCarthyism, international relations, social change and evolution, complex organizations, health care, universities, religion, professions, small groups, and family as well as abstract questions such as the place of norms in maintaining social order both historically and cross-nationally. Marxian theory and dynamic system theories have also been applied to a spectrum of diverse empirical and policy subjects. Moving further away from realist models, we come to some core ideas of modern sociological institutionalism (see DiMaggio & Powell, 1983; Powell & DiMaggio, 1991; Scott, 2001; Jepperson, 2002; Hasse & Kruecken, 2005). Here, actors are substantially empowered and controlled by institutional contexts, and these contexts go far beyond a few norms or network structures. Further, these contexts are by no means simply constructions built up by the contemporary actors themselves, but rather are likely to have prior and exogenous historical origins.