The idea of a “single market and production base” in the ASEAN Economic Community (AEC) is to provide ASEAN consumers with more choices of goods at lower prices and offer regional producers more space for production activities. ASEAN member countries (AMCs) have made progress in reducing average tariffs to less than 1 per cent for regional trade. However, issues remain over the utilization rate of Common Effective Preferential Tariff (CEPT) preferences. Non-tariff barriers (NTBs) continue to prevail in the region, mainly in the chemical, machinery, and electrical sectors. These barriers are used as policy tools by AMCs to protect domestic interest groups. NTBs are most prevalent in Indonesia, followed by Vietnam. The ineffectiveness of NTB reform can be attributed to ASEAN's way of dealing with the issue — voluntary declaration and the absence of mechanisms of verification. Despite these issues, as a whole, AMCs have collectively benefitted, albeit in a limited way, from its action of tariff reduction and regular discussions on NTBs. AMCs’ “open regionalism” has helped integration by creating trade rather than diverting it. Going forward, key policy recommendations are: generating and maintaining political will for economic integration; generating greater awareness about the pervasiveness and impact of NTBs; streamlining NTBs and harmonizing them with existing international databases; increasing public AMC outreach activities with respect to AEC and its benefits; and pushing for domestic reforms in smaller economies such as Cambodia, Laos, Myanmar, and Vietnam.