"The purpose of this handbook is to offer a practical guide to good professional practice in the design, development and delivery of audio materials - radio, audio cassettes and audio-vision - for distance and open learning. The handbook is intended for all those who are involved in the design, development, production and use of audio materials in distance education and open learning. It will be of particular interest to teaching staff and radio/audio producers who are using - or planning to use - audio as part of their courses. However, the handbook will also be of interest and value to others who are involved in or affected by the use of audio in distance and open learning - for instance, policy makers and planners, managers and administrators, those working on related media (e.g. print, TV and video), face-to-face tutors and facilitators." (Introduction)