This book showcases how language learner agency can be understood and researched from varying perspectives by providing, for the first time, a collection of diverse approaches in one volume. The volume is organised into three main sections: the first sections offers an introduction to varying theoretical approaches to agency; the second section presents analyses of agency in a variety of empirical studies; and the third section focuses on the pedagogical implications of data-based studies of agency. The volume includes the work of researchers working in languages including English (ESL and...