This book deals with fundamental issues concerning "product" sound quality design. Conventional books deals with only subjective evaluation methods or pycho-acoustics. Good part of this book is that it relates such conventional field to physical aspects governed by acoustics and mehanical vibration. However, from the view point of automotive NVH engineer who have much experience of improving motor vehicle sound quality, this book lacks advanced technology of improving excitation force spectrum or structural transmission characteristics in today's industry. However, engineers who want to begin sound quality design should read this book once.