Small and medium-sized enterprises (SMEs) account for about 97-99 per cent of total enterprises and 60-80 per cent of total employment in ASEAN countries. The participation of SMEs is thus crucial for achieving greater regional economic integration amongst ASEAN countries. SMEs are, however, often constrained by many disadvantages that limit their abilities to become importers and exporters. This is well documented in the research literature on trade and firm size. This volume contains selected ASEAN country studies on the participation of SMEs in regional economic integration based on primary microdata. This is supplemented by empirical studies on the role played by East Asian multinational enterprises in the region.