This book deals with the scope and nature of the EU's external influence over South-Eastern Europe in the present enlargement. By elaborating on the Europeanisation of the Western Balkans in a systematic, theory-oriented and comparative way, the book provides rich insight into the dynamics of the current enlargement and offers a comprehensive analysis of the EU's avenues of external leverage in the field of justice and home affairs. In this key sector of cooperation, the EU is particularly interested in ensuring a strong lever, since the Western Balkans region constitutes a prime source of security concerns for the EU. However, a certain enlargement fatigue, the discussions on the EU's integration capacities and several other factors contribute to the fact that it is unclear when or even whether these aspiring candidates will actually make it into the EU. In view of this uncertainty, how strong is the EU's leverage in the Western Balkans? The book is an important contribution towards a better understanding of how the EU's use of pre-accession conditionality has changed since the Eastern enlargement and which factors have driven Croatia and Macedonia in their process of adjustment to the EU. It will be of interest to decision-makers, officials and academics concerned with adaptation and transformation processes in South-Eastern Europe and the possibilities and limitations of the EU's influence in the outside world.