The Routledge Handbook of Digital Language Assessment offers a contemporary account of digital language assessment in a period of rapid technological and educational change. Bringing together contributions from experts across diverse fields and contexts, the chapters examine issues related to test theory, test development, test scoring, test infrastructure and quality assurance, and test impact.

Using the Duolingo English Test (DET) as a central case study, the volume explores how digital-first assessment can expand access while supporting valid score interpretation, fairness, security, and stakeholder trust. Designed for researchers, educators, and anyone interested in the future of language assessment, this volume provides a clear and engaging overview of where the field is headed and why it matters.

Ben Naismith is a Staff Language Measurement Scientist at Duolingo, where he works on research and development of the Duolingo English Test.

Alina A. von Davier is the Chief of Measurement Science at Duolingo. She has provided thought leadership to the Research and Development area for the Duolingo English Test for the past nine years.

Jill Burstein is a Principal Language Management Scientist at Duolingo, where she leads validity, efficacy, and responsible AI research for the Duolingo English Test.

Geoffrey T. LaFlair is a Principal Language Measurement Scientist at Duolingo, where he leads Assessment Research and Development for the Duolingo English Test.