This book will serve to meet the needs of those studying Audiology, particularly of those who wish to become hearing aid audiologists. However, it is also an essential and valuable resource that will be of interest as a reference book, and should be in every hearing aid clinic’s reference collection.This new edition was needed because the field of Audiology has developed since the book was previously published, with important changes in standards and codes of practice. The book provides simple diagrams and photographs to assist the reader, and covers further detail and more diverse new areas than the previous editions. A comprehensive index makes it easy to locate the information needed.