Internationally recognised as one of the leading texts in its field, this volume offers a comprehensive introduction to vocabulary for language teachers who would like to know more about the way vocabulary works. Two leading specialists make research and theory accessible, providing the background knowledge necessary for practitioners to make informed choices about vocabulary teaching and testing. This second edition retains the popular format of the first edition, and has been rewritten to take account of the many developments in the past 20 years. There is a greater focus on the vocabulary learning process, with new chapters on incidental learning, and intentional learning, and a new wide-ranging discussion of formulaic language. The book now also includes extensive treatment of word lists and vocabulary tests, with explanations of their various strengths and limitations. Updated further reading sections, and new Exercises for Expansion make this volume more invaluable than ever.