We have a process in which our routing is assemble item complete. The process/safety instruction is broken down into different steps by operator. We currently use six operators to complete this process. We use a work traveler to sign off by the last operator to show that steps have been completed. We received an Action Request from UL during our continuous assessment that there is no objective evidence that the first team member performed a go/no go check. We need ideas on how others are documenting one piece flow processes and showing objective evidence that inspection/test requirements are being performed.