An accessible introduction to applied linguistics. This clearly-written, easy-to-understand book is perfect for students whose chosen fields require them to be acquainted with the ways language works - such as future teachers, psychologists, sociologists, and anthropologists - but who do not intend to become linguists. "Understanding Language Structure, Interaction, and Variation", Second Edition, provides an introduction to the study of language and applied linguistics for students who have had a minimum of exposure to the discipline of linguistics. The text is also suitable for English or ESL/EFL teachers who need a reference volume about various aspects of language, particularly as it applies to teaching. The second edition features an expanded treatment of English grammar, new topics like computer-mediated communication, current figures and data, and an up-to-date bibliography. A separate workbook providing extra practice is also available.