The Analytical Recognition of Regions by Opportunity and Willingness Data is employed in the dissertation Constrained to Cooperate: Domestic Political Capacity and Regional Order to determine the set of politically relevant regional clusterings in Post-Cold War space.  The map on the home page illustrates the general regional groupings identified.  The data is currently undergoing a revision to include regions from 1950-1978 using the COPDAB data (pictured below by decade).  Once complete, it will be posted on this website.  In the meantime, should you be interested in using the post-Cold War data, please contact me directly.