Of all the elements of the international wave of democratization that began some two decades ago, the transformation of communist political systems, once thought impervious to liberalization, is the most dramatic. Since 1989, more than two dozen countries within the former Soviet bloc have officially disavowed Marxist–Leninist ideology and have dismantled, in varying degrees, the apparatus of communist dictatorship and socialist economic planning. In many cases this transformation has led to a reinvention of politics, in the sense of genuine public debate about the purposes of society and the state, and has produced significant progress toward the establishment of a liberal–democratic order.

This extraordinary turn of events has evoked a surge of scholarly research and writing from specialists on the former communist countries and other social scientists. Analysts have probed the causes of the demise of communism in Eastern Europe and the former Soviet Union. They have examined the communist legacies inherited by the East European and Soviet successor states and have constructed parallel narratives of early postcommunist developments in regional groupings of these states. They also have produced detailed studies of recent trends in individual countries. Extensive analysis and debate have likewise been devoted to the political and institutional aspects of market reform.

To date, however, scholars have devoted relatively little effort to systematic cross-country comparisons of political change in the postcommunist states.