This volume reflects the emerging interest in cross-disciplinary variation in both spoken and written academic English, exploring the conventions and modes of persuasion characteristic of different disciplines and which help define academic inquiry. This collection brings together chapters by applied linguists and EAP practitioners from seven different countries. The authors draw on various specialised spoken and written corpora to illustrate the notion of variation and to explore the concept of discipline and the different methodologies they use to investigate these corpora. The book also seeks to make explicit the valuable links that can be made between research into academic speech and writing as text, as process, and as social practice.