In Reply to Parent Post by Marc
A nonconformance is something (product or service) which is not to print or in some way does not fulfill the agreed to requirements.
I've really never heard of anything referrred to as an 'unplanned' deviation. If something screws up and its not detected until after the process is finished (or a part of a 'batch' or whatever) one determines whether its usable or not and may ask for waiver (concession) if it is. If I was in a court room I might want to call it 'an unplanned deviation' to keep the verbiage sounding neutral to a jury.
In my experience, use of the word "unplanned" is a euphemism for human error in most cases. Other times, "unplanned" is a euphemism for a pure special cause event (lightning bolt or power surge affects performance of machine.)
The bulk of the time, "unplanned" deviation results in a nonconforming product or service. Very rarely (almost never) it results in a happy (lucky?) improvement.
The premier example of this happy improvement is the oft-cited creation of Ivory brand bar soap (99-44/100% pure. It floats!
) being the result of an unplanned deviation
wherein an operator left a mixer running longer than the planned time and it entrained sufficient air bubbles into the soap mixture to make the resulting bar of less specific gravity than water, hence It floats!
I hope this little discourse helps put the term unplanned deviation in perspective.