This report came about after a long process of capacity building workshops at the regional, subregional, national and sub-national levels; bilateral and sub-national consultations; technical visits to the countries; and validation by the countries and EFA partners. Gathering data and analyzing the educational disparities within the country was a tedious task that needed much time, concentration and patience. The dedication and commitment showed by the Mekong countries in carrying out the national assessment and sharing the results with the UIS-AIMS Unit, UNESCO Bangkok was crucial to the completion of the sub-regional report. We thus thank, first and foremost Cambodia, Lao PDR, Myanmar, Thailand and Viet Nam for sharing with UNESCO various drafts of their national EFA Mid-Decade Assessment reports, which is a core component of this sub-regional report. Country representatives also reviewed and validated this sub-regional report.