This book shows engineers with little or no previous exposure to experimental design how to use statistically designed experiments to improve products and processes. A prerequisite is an appreciation for the concept of random variation, gained through a typical statistics course or by using statistical process control in a manufacturing environment. Dr Taguchi has added greatly to our understanding of the importance of properly designed experiments in quality improvement and has provided a structured approach to designing quality into products and processes. His use of experimental designs to reduce variability and make designs more robust has had a major influence on perceptions of the role of experimental design in quality improvement. This book also covers other methods, such as the important work of Dr George Box and his associates on orthogonal designs.