The movement from regional economic cooperation towards regional integration in Southeast Asia has been gaining strength since the end of the Cold War and more remarkably since the economic crisis of 1997-1998. The ambitious plan for regional integration, however, could face challenges due to the diversity of economic development and structure and the lack of political will. In particular, this paper will argue that the ASEAN Way, which has been a basis for regional cooperation in Southeast Asia, is now under pressure for modification, if not removal. It has been argued that the ASEAN Way emphasizing on compromise through formal and informal meetings, consensus-based decision making, avoidance of strict reciprocity, and rejection of hard le...