This book highlights the range of issues involved in designing interior spaces for acoustics--that is, ensuring that the sound of a space matches its function. The book presents the principles of acoustic design, together with practical advice on how to apply those principles. The fundamental elements of background sound, intruding sound, sound quality, and speech intelligibility are each described, with design goals, calculation procedures, and advice on implementation. Contemporary challenges associated with integrating acoustics and sustainable building design are also covered. Finally, two types of space--school classrooms and hospital wards--are considered in detail, as examples.