Following some ten years as a practicing lawyer and consultant, Kirstyn Inglis has been researching the evolving legal practice of EU enlargement for over ten years and successfully defended her PhD on the subject in 2006. This book, succinctly, introduces this evolving practice, covering ‘transitional arrangements’ in accession treaties, the Treaty of Lisbon, recent European Court case law, the specific governance challenge of incorporating Bulgaria and Romania and the strategy for future enlargements to bring in the Western Balkans and Turkey. In part two, the examples of the environment and the agri-food acquis are explored, including the analysis of the transitional arrangements in practice. Overall, the diversity and complexity of the preaccession and post-accession challenge of enlargement becomes apparent, as do key challenges for the evolution of the acquis communautaire in an enlarging Union at a time when Croatia is waiting to sign an own accession treaty.