"This volume revitalizes the field of second language pronunciation assessment, offering new and diverse scholarly insights on features of pronunciation and how these are perceived and evaluated by listeners and trained raters, on the challenges to test validity posed by shifting pronunciation norms, and on technological advances in measurement. Essential reading for pronunciation researchers, professional language testers and graduate students of language assessment, the book will also be illuminating for ESL teachers and applied linguists more generally." Catherine Elder, University of Melbourne, Australia