The European Union's (EU) membership conditionality has been perceived as a highly effective means of influence on non-member states in the run-up to the 2004 and 2007 enlargements. According to the incentive-based explanation that dominates the literature, conditionality has been particularly effective when the EU offered a credible membership incentive and when governments did not consider the domestic costs of compliance threatening to their hold on power.

This volume challenges much of the existing work on EU enlargement and postcommunist transition, however, by testing the...