As the fifth refereed volume of the Asia-Pacific Association for Computer-Assisted Language Learning (APACALL) Book Series, this book explores language teacher development in technology-enhanced language teaching (TELT) and presents a collection of TELT activities. The book provides a valuable resource for language teachers, teacher educators and researchers. It can be downloaded for free and shared with others. Please cite as: Son, J.-B. (Ed.). (2020). Technology-enhanced language teaching in action. APACALL. https://www.apacall.org/research/books/5/ ISBN 978-0-6486653-1-1 The whole book can be downloaded by clicking on the complete book link below. Technology-Enhanced Language Teaching in Action (complete book, PDF, 5.4 MB) Part I Language Teacher Development in Digital Environments Part II Language Teaching in Digital Contexts