Book excerpt: Fundamental Considerations in Technology Mediated Language Assessment aims to address issues such as how the forced integration of technology into second language assessment has shaped our understanding of key traditional concepts like validity, reliability, washback, authenticity, ethics, fairness, test security, and more. Although computer-assisted language testing has been around for more than two decades in the context of high-stakes proficiency testing, much of language testing worldwide has shifted to “at-home” mode, and relies heavily on the mediation of digital technology, making its widespread application in classroom settings in response to the COVID-19 outbreak unprecedented. Integration of technology into language assessment has brought with it countless affordances and at the same time challenges, both theoretically and practically. One major theoretical consideration requiring attention is the way technology has contributed to a reconceptualization of major assessment concepts/constructs. There is very limited literature available on the theoretical underpinnings of technology mediated language assessment. This book aims to fill this gap. This book will appeal to academic specialists, practitioners, or professionals in the field of language assessment, advanced and/or graduate students, and a range of scholars or professionals in disciplines like educational technology, applied linguistics, and teaching English to speakers of other languages (TESOL).