This book provides an accessible introduction to this emerging and socially critical branch of the language professions. The focus is on the development of a professional framework in which public service professionals, including managers, can learn to work together with their new colleagues to deliver a professional service to those seeking access across linguistic and cultural barriers. The book brings together a wealth of practical and professionally-oriented information which will benefit trainees, trainers and practising professionals alike, as well as those who manage and work with them.