This title details the key terms, thinkers and texts in systemic functional linguistics. The field of Systemic Functional Linguistics is a social semiotic approach to language pioneered by M. A. K. Halliday, which has assumed a central importance in linguistics in recent years, anchored by a growing body of work. This book details the key terms, the key thinkers and the key texts in this field in an approachable, easy to understand and accessible manner. It is authored by leading names in the field and is aimed at undergraduates and postgraduates studying linguistics and language studies. "The Key Terms" series offers undergraduate students clear, concise and accessible introductions to core topics. Each book includes a comprehensive overview of the key terms, concepts, thinkers and texts in the area covered and ends with a guide to further resources.