1. Processing omissions (a step was forgotten)
2. Processing errors (something was done incorrectly)
3. Error in setting up the work piece
4. Assembly omissions (a part was forgotten)
5. A wrong part / item was included
6. Wrong work piece
7. Operations errors (incomplete information, procedures not followed)
8. Adjustment, measurement, dimensional errors
9. Equipment maintenance errors
10. Errors in preparation of tools, fixtures, blades, etc
Error: When any condition necessary for successful processing
is wrong or absent.