I'm filling a check sheet in for each tester for qc, attaching it to a copy of certificate or failure, and keeping a list on the wall. Doing it for each tester, each class, once a month, total of 9 qc's per month.

The other issue is, to get best score on risk assessment, you have to have your qc system audited by an independent person.
A couple of garages in the area are getting together to form a group to do this for each other. The rules don't state who it has to be, so we think this qualifies.