'A superb, timely, user-friendly contribution synthesizing knowledge and advancing practical guidelines on the burning question of the linguistic factors to target to promote intelligibility. Highly recommended for all educational practitioners concerned with enhancing learners' spoken English interactions, including as a core resource for teacher training.' Talia Isaacs, University College London Biografía del autor John M. Levis is Professor of TESL (Teaching English as a Second Language) and Applied Linguistics at Iowa State University. He is co-editor of Social Dynamics in Second Language Accent (2014), The Handbook of English Pronunciation (2015), and Pronunciation: Critical Concepts in Linguistics (2017), and is the founding editor of the Journal of Second Language Pronunciation.