Event : Supplier implemented a new chemical tank That change was not properly qualified for all the parameters. Product was shipped without SCN. It caused a variation in the final chemical affecting the wafer processing.Root cause : Those who handled the product and such a change did not have propertraining by SCN and/or following SCN requirement Change management requirements were not well defined and enforced for thatchange. Not a “clear” SOP with a “gating system“ function for production record to linkto the change approval, barcode and shipping system.