This book is jam packed with easy to ready information explaining essential ELT terminology. It is presented in a very clear and readable A-Z format and is divided into sections such as grammar, vocabulary and discourse.
Whilst some of the terminology is pretty simple and obvious to experienced teachers, it does still include essential information for DELTA trainee teachers or indeed any other teacher who is generally interested in teaching English as a foreign language.
Scott Thornbury is definetly one of the better ELT authors out there! This is highly recommended!