Thai Library community hosted the 4th Congress of Southeast Asian Librarians in 1978 and the 9th Congress of Southeast Asian Librarians in 1993. Again in 2015 Thai Library Association and the National Library of Thailand will host the 16th Congress of Southeast Asian Librarians. As mostly known, all 10 nations in Southeast Asian Countries will be one ASEAN in 2015. It will, therefore, be the appropriate time for all libraries and information centers in Southeast Asia to look into the possibility when all library and information center cooperate in serving users as one standard ASEAN Knowledge library and information center. Thailand proposes to choose the theme “ASEAN Knowledge: Library for Sustainable Advancement” for the 16th Congress of Southeast Asian Librarians: Meeting and General Conference, Bangkok 2015.