Because the employee did not perform the work steps. The decision to fix the problem by not informing the supervisor for validation. An error has occurred, which is detected by the QA.
The employee does not perform the procedure. To fix the problem themselves by not notifying supervisors know to check for accuracy. Error detected by QA.
Because employees don't work on stage work. Decided to fix the problem yourself without inform supervisor to check for accuracy. Error, which is detected by the QA .