This book examines the key motivations for and challenges to greater regional integration in Southeast Asia. It demonstrates how security and economic concerns -domestic, regional and international - have either contributed to, or detracted from, an increased level of unity and cooperation in ASEAN. It also explores how the patterns of interaction and socialization generated by these issues, together with the nature of domestic political systems, have affected the emergence of common values, norms and interests. It covers the full range of issues confronting ASEAN at present, and the full range of ASEAN countries, and discusses both developments in ASEAN to date and also likely future developments.