This commentary takes up conceptual issues raised in the introduction. Discussing the contributions to this volume, we offer three points. First, the concept of fragmentation needs theoretical clarification, which can be provided to some extent by sociological differentiation theory. We suggest...

This article presents the International Regimes Database (IRD), an analytical tool designed to (i) move regime analysis from its current emphasis on the use of discrete case studies to the use of a relational database encompassing comparable data on a large number of cases and (ii) facilitate...