Most teachers and researchers would agree that any success or failure in language learning is largely dependent on the learner's motivation to learn the foreign language. But what is motivation? How can we increase it? How can we assess it? These are some of the key questions covered by this book. It provides a summary of the various facets of motivation and examines how theoretical insights can help language teachers in their everyday teaching practice. The text covers both theory and practice, is illustrated with concrete examples, and offers research guidelines and tips for both novice and experienced teachers. A companion Website contains useful web linmks, lists of relevant databases, and 150 questionnaire items.