The Control Processes Ch.
Six Sigma - Wikipedia
The Nature of Breakthrough Ch. Breakthroughs in Leadership Ch. Breakthroughs in Organization Ch. Breakthroughs in Culture Ch.
Breakthroughs in Adaptability Ch. Strategic Quality Planning and Deployment Ch. A Road Map for Change. Notes Includes bibliographical references p. Dewey Number View online Borrow Buy Freely available Show 0 more links Set up My libraries How do I set up "My libraries"?
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These online bookshops told us they have this item:. Tags What are tags? Add a tag. Public Private login e. Add a tag Cancel Six Sigma. Lists What are lists? Bank of America has used Six Sigma for credit risk assessment reduction, fraud prevention, and customer satisfaction improvement, etc. Insurance companies have used Six Sigma for various critical tasks like premium outstanding reduction and various cycle time reductions. DMAIC is used to improve an existing business process.
- Juran Institute's Six SIGMA Breakthrough and Beyond: Quality Performance Breakthrough Methods;
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DMADV is used to create new product designs or process designs in such a way that it results in a more predictable, mature and defect free performance. Also see Design for Six Sigma quality.
Six Sigma identifies five key roles  for its successful implementation. It is now very common to have Master Black Belts conducting and providing daily management for the program, with both Black Belts and Green Belts managing projects in their existing area of responsibility, and reporting to their existing managers. Some argue that Robert Galvin and Bill Smith did not really "invent" Six Sigma in the s, but rather applied methodologies that had been available since the s and were developed by luminaries like Shewhart , Deming , Juran , Ishikawa , Ohno , Shingo , Taguchi and Shainin .
In truth, there is very little that is new within six sigma. However, it does use the old tools in concert, for far greater effect. The telephone, the internal combustion engine, and the computer were all made from existing technology, used in a new way. The same is true of six sigma. The use of "Black Belts" as itinerant change agents is controversial as it has created a cottage industry of training and certification which arguably relieves management of accountability for change; pre-Six Sigma implementations, exemplified by the Toyota Production System and Japan's industrial ascension, simply used the technical talent at hand — Design, Manufacturing and Quality Engineers, Toolmakers, Maintenance and Production workers — to optimize the processes.
The term "six sigma" comes from the notion that if you have six standard deviations between the mean of a process and the nearest specification limit, you will make practically no items that exceed the specifications. Criticism of the tool itself, and the way that the term was derived from the tool often sparks criticism of six sigma. It is often said that a six sigma process produces 3. A process that is normally distributed will have 3.
A Capability Study on normally distributed data, mean 0, standard deviation 1, with an upper specification limit of 4. Some six sigma practitioners call this 4. Donald Wheeler, one of the most respected workers in statistics, dismisses it as "goofy". As sample size increases, the error in the estimate of standard deviation converges much more slowly than the estimate of the mean see confidence interval.
With even a few dozen samples, the estimate of standard deviation often drags an alarming amount of uncertainty into the Capability Study calculations.
SIX SIGMA - Juran Institute's Road map
It follows that estimates of defect rates can be very greatly influenced by uncertainty in the estimate of standard deviation. Estimates for the number of defective parts per million produced depend on knowing something about the shape of the distribution from which the samples are drawn. Unfortunately, we have no means for proving that data belong to any particular distribution.
Related Juran Institutes Six Sigma Breakthrough and Beyond: Quality Performance Breakthrough Methods
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