We are having a 'spirited discussion' about what constitutes on out of tolerance (OOT) condition for the calibration of customers standards and equipment. As QA I say it's any condition that does not meet the customers contractual requirements, or pass our calibration procedure. This is generally agreed to except in the case when the equipment is in operative. If its inoperative, then some people say its not an out of tolerance condition. Where can I find a clear definition for OOT? I'm interested in learning about other peoples views on this topic. Thanks for the feedback.