This edited book presents and discusses theoretical, practical, and research developments in English pronunciation in order to establish evidence-based directions and recommendations for best practices in English speech assessment, research, and training. It features leading pronunciation experts from diverse contexts who share cutting-edge research and valuable insights. The collection consists of six parts. Part 1 introduces the aims, focus, and structure of the book, and describes its intended audience. Part 2 reviews, provides empirical evidence, and offers critical analyses guiding different aspects of English speech assessment. Parts 3 and 4 report empirical findings and research perspectives on the perception and production of English speech. Part 5 shares current practices in phonetic training and their effect on learners and listeners. Part 6 presents theoretical perspectives on the acquisition of phonology in multilinguals.