Are Sigma-metrics immune from manipulation? It should hardly be surprising that manufacturers will find ways to "boost" their Sigma-metric performance. A recent white paper provides an example of how manufacturers might mislead you - or make a mistake in their Sigma-metrics - and therefore alerts us to the safeguards we need to insist upon when we analyze performance data.
Advanced Quality Management / Six Sigma
When it comes to Quality, where are we now? Dr. Westgard reviews the evolution of quality control, quality design, as well as the development of tools to help plan quality. It helps to understand how we arrived at Quality Systems - and where we should plan to go in the future.
What does it mean when the Sigma-metric is above Six Sigma? What are the implications of superior performance? Are there any benefits to improving beyond Six Sigma?
Six Sigma is a useful tool, but how do we convert our measurements and and compare our processes to the Six Sigma scale. This lesson explains how to use method validation data to convert measurements typically made by the laboratory into Sigma-metrics. Using Sigma-metrics, you can make a definitive decision on the suitability of a method for your applications. (Preview)
In other lessons, we've discussed how to turn method validation data (method performance claims) into Sigma-metrics. But what about the case when only limited claims are available? Sometimes a complete method validation study is not available - and only the manufacturer claims for precision are readily at hand. How can you turn those claims into something useful on the Sigma scale? (Preview)