This book brings together a distinguished set of contributors from a variety of disciplines to examine current theories of institutional change. The chapters highlight the limitations of these theories, finding them lacking in the analytic tools necessary to identify the changes occurring at a national level, and therefore tend to explain many changes and innovation as simply another version of previous situations. Instead a model emerges of contemporary political economies developing in incremental but cumulatively transformative processes. The contributors show that a wide, but not infinite, variety of models of institutional change exist which can meaningfully distinguished and analytically compared. They offer an empirically grounded typology of modes of institutional change that offer important insights on mechanisms of social and political stability, and evolution generally.