Why-1: Part with ovality got mixed up with the correct parts and reached final inspection.|Why-2: End mill was used to carry out the boring operation in Slim3n-5AHT-1 as there was no provision to clamp the boring tool in the machine and this resulted in ovality of the part.|Why-3: Trial of proving part in Slim was carried out to have an alternative for the Mazak and the rework was planned to be completed at the end of the production of that batch so the part was kept separate without identification.|Why-4: During the shift change there due to communication gap the part separated for rework got mixed up with the good parts and got handed over to Inspection for final inspection.