ISO 9001: 8.5.3 states "... determine requirements for
a) Determining potential nonconfromities and their causes,..."
Maybe I am reading into this to much or I am having a difficult time define the requirements for determining potential nonconformities and their causes. Currently I am thinking along these lines.
Preventive Actions may be identified during: management reviews, trend analysis, etc.
But I do not believe it is that simple and these do not seem like requirements to me. Any help would be greatly appreciated.
Let me toss out a few thoughts on the page.
Besides the difference of an actual nonconformance and a potential nonconformance, these two things have other differences as well.
Corrective actions tend to be reactive in nature. That is, it is in reaction to something that went wrong.
Preventive actions are proactive in nature. You act before the problem develops.
The cause of corrective actions tend to be hidden or occluded. The cause of a preventive action is usually known as soon as the preventive action is identified (not hidden). On this point, it is interesting to note that the standard treats them differently here in that for corrective action the reviewing of them and determining the cause are two separate lines (8.5.2 a & b) and for preventive actions, they are on the same line (8.5.3 a).
Corrective actions are practiced to prevent recurrence. Preventive actions are practiced to prevent occurrence.
Besides looking at KPI trends, as you recognized, other possible sources include audit observations, audit opportunities for improvement, and management decisions.
About management decisions, managers, by nature, solve problems, potential or otherwise. It is innate to the position. Management decisions that are part of continual improvement can be recorded as preventive actions. It may help to remind managers to do so. It could be a standing agenda item for a weekly management meeting to say something like "have any of you made any management decisions this past week that should be recorded as a preventive action? If you have, please stick around for a moment so we can start the paperwork".
It has been my experience that most companies actually are pretty good about practicing preventive actions, just lousy at recording them.