Paul Pierson has undertaken an important theoretical venture for comparative politics, and for social science more broadly. Recognizing the historical turn in the social sciences, and taken with the theoretical power of path dependence, Pierson hopes to generate “portable” mid-range theoretical constructs to align history and social science more closely. Were we to have an armament of arguable hypotheses about timing, sequence, and “temporal processes” our understanding of politics and political development would be much advanced. This is a tempting prospect.