Because the employee did not perform the work steps. The decision to fix the problem by not informing the supervisor validation. Cause errors which were detected by QA.
The employee does not perform the procedure. To fix the problem themselves by not notifying supervisors check the validity. The error is detected by QA.
Because employees don't work on stage work. Decided to fix the problem yourself without letting foreman check for accuracy. Cause the errors which are detected by the QA .