This book explores the reliability of official statisticaldata in the ASEAN (the Association of Southeast Asian Nations), and thebenefits of a better vocabulary to discuss the quality of publicly availabledata to address the needs of all users. It introduces a rigorous method todisaggregate and rate data quality into principal factors containing a total often dimensions, which serves as the basis for a discussion on the opportunitiesand challenges for data quality, capacity building programs and data policy in SoutheastAsia. Tools to standardize and monitor statistical capacity and data qualityare presented, as well as methods and data sources to analyse data quality. Thebook analyses data quality in Indonesia, Malaysia, Singapore, the Philippines,Thailand, Vietnam, Brunei, Laos, Cambodia, and Myanmar, before concluding withthoughts on Open Data and the ASEAN Economic Community (AEC).