Quality Control Checklist Protocol
See example done for the 3D printer in 2018 at https://docs.google.com/presentation/d/1rUhTMleIRipqhow2xcj9W2i2JxVswxyEp-P3yOgWDPg/edit#slide=id.g454d00b924_0_0
Quality control refers to making sure things go right during the build, with the assumption that parts are functional.
Troubleshooting and Repair refers to those procedures that arise from parts actually not working. For example, in a 3D printer, if a stepper motor does not work, that could be due to the stepper motor, wiring, RAMPS board, Pololu driver, or even Arduino. A procedure must be created to identify and fix the issue - in the Troubleshooting and Repair section of development. The Quality Control Checklist is a preemptive process, but does not necessarily account for part functioning.