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 systemEvent : Supplier changed HEPA filters with a new Al frame material in a cleaning stepwithout proper change evaluation and SCN (vs. old one was PP frame),resulting in extra Al contamination in final product shipped. Root cause Did not put HEPA part through a full change evaluation, qualification, andcontrol and SCN. FMEA was not effectively to assess all the potential risks associated with change. Event : Wiresaw grit showed acceptable results in initial qualification, but did notperform well in HVM. Root cause : Environmental changes affecting materials properties not properlycharacterized and understood. The operations had no sense for the change of raw material’s properties.Event : An IPA Supplier changed the “tube” for safety reason. IPA showed a higher metal level - within spec, but out of control. Resulting in a shift of metal in final wafer product causing product recall,and line interruption. Root cause : Change management for evaluation of that metal was not well-definedrelative to a capability shift. That change SCN was not communicated for effective assessment