Chapter 31

Quality Loss Function


“It is better to be precise and inaccurate than being accurate and imprecise.”

“Quality should be designed into the product and not inspected.”

“Quality is achieved by minimizing the deviation from the target.”

“The cost of quality should be measured as function of the deviation from the target.”

These are the philosophies highlighted by Genichi Taguchi and which form the principal concept behind the quality loss function put forward by him. This chapter explains these philosophies and details the principles and methodologies to achieve them.


Quality loss function; Precision vs. accuracy; Taguchi philosophy; Off-line quality control rule; System design; Parameter design; Tolerance design; ...

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