This work investigates the evolution and formal authority of regional government structures across 42 distinct democracies between 1950 and 2006. Authors Liesbet Hooghe, Gary Marks, and Arjan H. Schakel utilize a rigorous quantitative framework to measure the distribution of power between central and regional authorities. By synthesizing longitudinal data, the authors identify fundamental patterns of regionalization that have reshaped modern governance models over the latter half of the twentieth century.

Experts in political science and comparative governance identify this text as a foundational resource for understanding subnational authority and state development. Scholars frequently cite the Regional Authority Index as a primary tool for empirical research into the structural transformation of modern democratic states.