Book excerpt: ASEAN 50: Regional Security Cooperation through Selected Documents curates key official documents that establish ASEAN as the foundation of Southeast Asia's peace and security. Since 1967, ASEAN has played the crucial role of managing conflicts and maintaining stability in a region shaped by diverse political, economic and socio-cultural dynamics. During the Cold War, ASEAN's ability to keep major power rivalries and intra-mural disputes in check provided the conditions for economic growth in the region. Yet the extent of ASEAN's contributions to the security of Southeast Asia have not been systematically presented.This compendium of official ASEAN declarations, statements, treaties, conventions and workplans demonstrates the activism and innovation of ASEAN member countries in their management of regional security for the past five decades. ASEAN 50: Regional Security Cooperation through Selected Documents provides answers to how ASEAN remains a cohesive organisation through periods of regional conflict, how ASEAN unity thrives despite seemingly insurmountable differences among the ten members, and how ASEAN centrality is resilient against pressure arising from great power influences in Southeast Asia.