8.7. WHAT WE HAVE LEARNED IN CHAPTER 8
Getting valid samples and data is just as important as applying any statistical tool.
The people and methods used for taking the samples and data affect the randomness and accuracy of both. Also, the product population is changing as the process changes, sometimes quite radically and often.
It is generally not possible to sample all the mini-populations caused by the people and changes caused by the process.
Use the fishbone diagram to identify the key process input variables (KPIVs) that cause all these mini-populations. Use the problem definition and close analysis of the fishbone to limit your focus.
Generally, the easiest approach to improving a process's output quality is to center the total process or ...
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