I was recommended this book by a number of tutors at my college. It is an excellent book for understanding the implications, uses and deign of sound for film. It also serves as a good reference book, and I find that when I am stuck for an idea, referring to it helps to get the ball rolling again. I'd highly recommend it to anyone who is seriously interested in filmaking,including directors, as it also gives ideas on how to marry sound and image. It is very practical and easy to read, and a must for anyone interested in making good films.