Book excerpt: In this substantially revised and updated second edition, this work examines the intersection of EU law and international arbitration based on the experience of leading practitioners in both commercial and investment treaty arbitration law. It expertly illustrates the depth and breadth of EU lawÕs impact on party autonomy and on the margin of appreciation available to arbitral tribunals. This second edition covers all relevant new developments in law and practice, and tracks the ever-increasing influence of EU law and the jurisprudence of the Court of Justice of the EU (CJEU) in international arbitration.