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RCBeyette said:
A preventive action would be when the difference from the norm was taking a downward trend to one of the limits. Not yet out of spec, but apparently heading in that direction. PA would entail maybe changing some equipment that has worn out, or getting a cup of coffee for the guy taking measurements for the samples...you get the idea.
Why are you taking action? "the difference from the norm was taking a downward trend to one of the limits". So, you are reacting to a situation. Your experience tells you that continual downward trend would lead to a nonconformance. You are correcting the trend. That's corrective.
Okay, let's change the scenario. Let's say you are making an adjustment because it means that it will save you money, or time or something. The process is okay, the way it is, but you want to make it better. Now that's prventive, right? No, you are reacting to a less than desirable state, but you are still reacting. Still corrective.