Why do some information technology innovations come to be adopted widely while others do not? One promising research stream has begun to investigate how institutional factors shape the diffusion of IT innovations. Here we examine how these institutional factors themselves are shaped. Specifically, we explore how interested actors termed institutional entrepreneurs develop institutional arrangem...

Research on differentiated integration (DI) in the European Union (EU) has focused causes, conditions, and patterns of differentiation integration. By contrast, we know less about its effects institutional outcomes public support; moreover, alternatives to de jure DI providing flexibility are still rarely accounted for. This introduction special issue takes stock of, discusses omissions, curren...