Sociological institutionalism is part of the larger group of new institutionalisms, which share the basic understanding that institutions matter in social processes. Opposing a more descriptive, “old” institutionalism and a rational-choice version of institutionalism, which defends the idea that actors have the option to choose independently from a large number of attitudes, sociological institutionalists introduced the notion of logic of appropriateness, influenced by a specific strand of the sociology of organizations. This understanding, however, led to limits in the explicatory force of the approach: institutional change, as well as continued conflict and differentiated power relations among actors, could not be explained well. More recent approaches that took sociological institutionalist assumptions very seriously offered a series of possible solutions to those difficulties. While elements of rationality and power exist implicitly in different conceptualizations of sociological institutionalism, these authors explicitly brought together both actors’ rational behavior and their embeddedness in broad institutional frameworks through concentrating on the power relations that exist among agents.