My company has been formally registered to IS9001 for 25+years. We are reviewing our maintenance departments calibration program and have found many inconsistencies with their interpretation of the standard. I would appreciate feedback on the following: when is calibration or verification required for machine process settings? For instance, if we have a coating machine that has line speed and oven temperatures that are used to produce Product A and we know these are critical characteristics, do we need to perform verification or calibration on these machine settings? We do end product testing on Product A to ensure that it is made correctly and meets the end customer's specs of thickness and hardness and calibrate the test equipment (ex: micrometer), so is it necessary to perform calibration on the machine's line speed and oven temp or is it up to us based on our risk analysis.