Introduction on Lean Six Sigma
Key to Improvement
If we cannot express what we know in numbers, we don’t know much about it.
If we don’t know much about it, we cannot control it.
If we cannot control it, we are at the mercy of chance.
Process Average is important...
…but Process Variation can be the killer
What is a Sigma?
“Sigma” (Standard deviation) is a measure of variation.
Plus or minus one standard deviation around the mean is about 68% of the total process output.
What does “Six Sigma” mean?
How can we achieve Six Sigma?
Note: Long term variation statistics used (with ±1.5s shift)
注： 采用长期变异统计 （±1.5s 漂移）
Cost of Poor Quality as a % of revenue
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