Quality control system of purchased part

The purchasing part quality control system is Dali uses the ¡°Spare parts appointed brand list¡± and ¡°spare parts concentrated purchasing list¡± to make sure the quality of the purchasing part. And change on the purchasing part must be pre-approved by the company board chairman, and it only be finally approved after the sample testing is confirmed. The sample quantity is 10-20 pcs and the try order will be 200 to 500 pcs. So many parts supplier said that quality threshold of Dali is very high.