8.4. CENTERING OR VARIATION?
The above examples were a way to get good samples/data when the problem definition indicated that the problem was related to a process not centered, so our emphasis was to improve the total process. As you will see later in the book, centering a process, or moving its average, is generally much easier than reducing its variation. Reducing process variation often involves a complete change in the process, not just a minor adjustment.
If the problem definition indicates that the problem is the variation and that the centering of the process is not the issue, then you would have no choice but to try to identify the individual causes of the variation and try to reduce their effect.
Again, you will save yourself a lot ...
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