Process CapacityY is the result of the process. Y is the quality of productions. Watching Y tells us the trend of quality. And if it changes, we control the quality.
Watching Y is often the second move. We may notice after a lot of rejects are made.
Watching X is the first move. X is the cause of the process. X is, for example, temperture of the facilities, materials and tools.
If we do not know the X of the quality trouble, we estimate the X . The PDCA of estimation of X will raise the level of watching.
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