The 15th International AsiaTEFL & 64th TEFLIN Conference is co-hosted by Universitas Negeri Yogyakarta, TEFLIN, and AsiaTEFL to pull together a number of current and critical issues for TEFL researchers, policy makers, and practitioners. They work with the complexity of making significant changes in TEFL policies, beliefs, and practices to improve the TEFL effectiveness for all students in this post-modern era. They also encourage EFL teachers to adjust to changing contexts over time with the focus of serving their students. In relation to this, the conference provides them with ample opportunities to share their experience and expertise. In particular, it is designed to share and examine contemporary conceptions of language learning and teaching and of their change over time leading to an awareness of the need to build language learning and teaching theories with a new paradigm.