We now shift from an intensive to an extensive mode of analysis. Instead of examining each single case in depth, we now try to pull together evidence from all the fourteen regimes that we have analyzed in part II. Instead of trying to identify the particulars of each case, we now search for factors that seem to shape outcomes in all or at least a large number of cases and try to determine the direction and strength of their impact. The purpose of this chapter is, in other words, to determine the patterns of association that exist between regime effectiveness and a set of variables that we assume can affect the formation and performance of regimes.