Effective change management/control and SCN (Supplier ChangeNotification) are critical parts of an integrated supply chain qualitysystem : from sub-suppliers to the suppliers, GW-SEMI, our customersand their end-users. SCN is not just about notification of a change, It is also about integrity,accountability and building a strong relationship. We must assess the effect of “changes” collectively and collaboratively. 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