This book investigates the underlying causes of fragmentation within European Union internal market law and the role of the Court of Justice in maintaining legal coherence. Niamh Nic Shuibhne, a scholar of EU law, examines the tension between the Court's judicial output and the political realities of Member State cooperation. She argues that while the Court bears a constitutional responsibility to provide clear, applicable framework principles, the efficacy of this mandate is inherently dependent on the support and legislative clarity provided by the Member States.

Legal scholars and practitioners frequently cite this work as a sophisticated analysis of the structural challenges facing the Court of Justice. Experts highlight the text as a significant contribution to the understanding of constitutional responsibility within the European legal order.