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Genichi Taguchi developed Taguchi methods and Design of Experiments (DOE). Taguchi's methods are a statistical approach, which was first used for improving the quality of goods in the manufacturing industry. These methods are now being used in biotechnology, engineering and marketing.
Taguchi provided three main contributions for statistical methods. The first is called the Taguchi loss function. The basic premise is that quality does not decrease when quality standards are exceeded. Loss increases when variations increase away from the intended standard. This description of the quality process has helped with lean manufacturing and the continuous improvement involved in the concept.
The second contribution involves off-line quality control, which includes system, parameter and tolerance design. His third contribution was innovation in experimental design. His work includes the understanding that the root of poor quality stems from excessive variations in the manufacturing process. The method includes understanding that quality costs begin with quality engineering. Total costs to society must also be included. Costs involve more than scrap and rework; costs involve early product failure in consumer use.
Taguchi's work has benefited the Six Sigma system by improving an understanding of variation management. Links available on Business.com can provide you with more information about Taguchi methods and Design of Experiments (DOE).