The inauguration of the Asia-Europe Meeting (ASEM) in Bangkok in 1996 was celebrated with enthusiasm and hopes in the two regions because this forum represented a breakthrough in Asia-Europe relations. The region-to-region pattern of the relations becomes the study framework that enables the explorations of central themes which include the Asian regional identity, ASEAN collective diplomatic prominence, and the informality of the ASEM institution. In exploring those central themes, this book applies constructivist, realist, and neo-liberal institutional theories consecutively. The difference between Asian and European cooperative culture, as well as the longevity of an international institution, adds to the picture. This book contributes not only to the study of Asia-Europe relations but also to the understanding of regionalism in Asia.