This volume charts the development of Cambridge teaching qualifications and tests, and presents case studies demonstrating their impact. Described by teacher and teacher educator Scott Thornbury as 'a very welcome addition to the literature on teacher assessment', this edited volume discusses key issues in assessing language teachers' professional skills and knowledge. It also provides case study illustrations of how teacher knowledge and teaching skills are assessed at pre-service and in-service levels within the framework of the Cambridge English Teaching Qualifications, and includes examples of specific assessment procedures for both teaching knowledge and practical classroom skills.