English as a lingua franca has become a hot topic in Applied Linguistics and English Studies. While it has been a subject of controversy for some time, linguistic observations on actual use have largely been missing out of the debate. This is now changing fast, and the study of English as a Lingua Franca has become a vibrant research field. This book reflects achievements of the growing field; it presents a good selection of empirical findings, thus providing substance to arguments. It comprises contributions from pioneers and established scholars in the field, along with reports from substantial ongoing research projects. The papers offer insights into the workings of English as a lingua franca in different contexts – conversational, academic, professional, and business situations. They tackle essential theoretical issues, analyse linguistic and interactional features of ELF, and discuss attitudes towards ELF. The studies are firmly anchored in analyses of authentic language in social interaction, some also using survey and interview data. Many papers also touch upon debates on language policy and linguistic ideologies. This collection of papers from the key areas of current ELF research is of interest to English linguists and applied linguists, graduate and undergraduate students of English, educational and language planners, and teachers of English.