This document provides an overview of global and regional economic integration. It discusses the evolution of the GATT and WTO in promoting global integration through reducing trade barriers. It also describes different levels of regional integration like free trade areas, customs unions, and economic unions. Examples of regional integration efforts in Europe, North America, South America, Asia, Australia/New Zealand, and Africa are outlined. Potential debates around regional integration being building blocks or stumbling blocks to global integration, and the effectiveness of the WTO, are also mentioned.