Chapter 5 analyzes the richness of the European Union’s journey on services trade and investment, drawing possible lessons for the future of ASEAN institutional design in this area. It retraces the historical origins and jurisprudence-led evolution of the internal market rules governing trade and investment in services among an expanding group of advanced nations and explores how the experience gained in building the internal market both influenced and paralleled the EU’s engagement with the rest of the world in services trade.