Book excerpt: Why is the 1979 the Court of Justice judgment in Cassis de Dijon so famous and so significant in the evolution of EU trade law?. As this landmark judgment approaches middle age, this book revisits this decision with the benefit of hindsight: why did the Court of Justice decide Cassis de Dijon as it did? How has the decision been developed by the EU? And, looking forward, how has the decision been used to develop international trade? This book brings together some of the leading writers in the field of EU trade law, constitutional law and European history for a fresh examination of this ground-breaking judgment, looking at it from the perspective of its past (who, what and why); its present (is it making a difference?); and its future (how does it fit in international trade agreements).