One of the essential principles of purchasing function is selection of right source for supply. This aspect has been emphasized by Railway Board through various circulars in the past RB Lr No. 2022/RS(G)777/1(E 3382862) New Delhi dated 07.07.2022 with Sub: Acceptance of tender, Consideration of performance of vendors. Railway Board letter dated 11.02.2016 interalia stipulates due consideration of dis-satisfactory past performance of vendors while deciding tender to ensure timely supply of material in required quantity to meet the needs of operation, maintenance, safety, etc. of the Railways. With complete digitization of supply chain, sufficient data is available on IREPS/IMMS reflecting various aspects of performance of suppliers for individual contract, supplier and item. Warranty failures and response of vendors to such failures is one of the important parameters of performance of a vendor. Suitable means may be adopted to capture warranty performance of the vendors. It is again emphasized that Performance of vendors, including warranty failures and response, would invariably be considered while deciding the tenders.