Real quick... In order to officially close a corrective action, there needs to be a certain amount of objective evidence collected that proves the corrective action has worked.. What about in situations where nothing can be done aside from waiting to see that the non conformance has not reoccurred? I've closed out a few handful of them where I have stated that there has been no further occurrences in the past 2 or 3 months.. My question is, is that legal from an ISO auditors standpoint? Or, does there need to be actual evidence in the form of a procedure change, or something similar? Thanks!