Taguchi methods are statistical methods developed by Genichi Taguchi to improve the quality of manufactured goods, and more recently also applied to engineering,biotechnology, marketing and advertising. Professional statisticians
have welcomed the goals and improvements brought about by Taguchi
methods, particularly by Taguchi's development of designs for studying
variation, but have criticized the inefficiency of some of Taguchi's proposals.
Quality control methodology that combines control charts and process control with product and process design to achieve a robust total design. It aims to reduce product variability with a system for developing specifications and designing them into a product or process. Named after its inventor, the Japanese engineer-statistician Dr. Genichi Taguchi who also developed the quality loss function.
Five major points of the Taguchi quality philosophy are :
Quality control methodology that combines control charts and process control with product and process design to achieve a robust total design. It aims to reduce product variability with a system for developing specifications and designing them into a product or process. Named after its inventor, the Japanese engineer-statistician Dr. Genichi Taguchi who also developed the quality loss function.
Five major points of the Taguchi quality philosophy are :
- 1.In a competitive market environment, continual quality improvements and cost reductions are necessary for business survival.
2.An important measurement of the quality of a manufactured product is the total loss generated by that product to the society.
3.Change the pre-production experimental procedure from varying one factor at a time to varying many factors simultaneously (SDE) , so that quality can be built into the product and the process.
4.The customer's loss due to poor quality is approximately proportional to the square of the deviation of the performance characteristic from its target or nominal value. Taguchi changes the objectives of the experiments and the definition of quality from "achieving conformance to specifications" to "achieving the target and minimising the variability.
5.A product (or service) performance variation can be reduced by examining the non-linear effects of factors (parameters) on the performance characteristics. Any deviation from a target leads to poor quality.
TAGUCHI'S DEFINITION OF QUALITY
The old traditional definition of quality states quality is conformance to
specifications. This definition was expanded by Joseph M. Juran (1904-) in
1974 and then by the American Society for Quality Control (ASQC) in 1983.
Juran observed that "quality is fitness for use." The ASQC
defined quality as" the totality of features and characteristics of
a product or service that bear on its ability to satisfy given
needs."
Taguchi presented another definition of quality. His definition stressed
the losses associated with a product. Taguchi stated that "quality
is the loss a product causes to society after being shipped, other than
losses caused by its intrinsic functions." Taguchi asserted that
losses in his definition "should be restricted to two categories:
(1) loss caused by variability of function, and (2) loss caused by harmful
side effects." Taguchi is saying that a product or service has good
quality if it "performs its intended functions without variability,
and causes little loss through harmful side effects, including the cost of
using it."
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