You need to monitor what happens once the welder or welders have been given the okay to start welding in order to make sure that all requirements are met. Is the required filler material being used? Is the welding progression as required (uphill or downhill)? Does the welder indeed make a stop and start in the middle of an AWS D1.1 fillet weld qualification test? The list goes on and on. Keep on your toes. You need to monitor what is happening to make sure that a welder only works on his/her own coupon, does not change the position or welding progression, does not grind excessively (if grinding is allowed at all), etc.