Rejecting the notion, endorsed by John Searle, of an “individual institution,” this chapter treats them as inherently social, and expresses no surprise that institutions have formed a central focus of sociological analysis since the discipline's founding. Engaging especially with work in the area of organizational theory and, beyond sociology, organizational and management studies, this chapter identifies an underlying dimension along which the literature can be arrayed, running from (macro, structural) scripts to (more micro, agentic) skills, as embodied in work by John Meyer and Neil Fligstein, respectively. Between these endpoints, this chapter identifies not only a similarly well-known Scandinavian institutionalism associated with March and Olsen and focusing on the microfoundation of bounded rationality, but also literature on institutional logics and institutional work emerging from business and management programs and only now starting to impact the broader social sciences. Beyond traditional strengths in explaining institutional maintenance, work in these idioms is making real progress in accounting for institutional origins and change.