The tenderer with past performance of satisfactory execution of contracts to SC Railway, or Other Zonal Railways/Pus of same / similar items for a quantity of 20 percent or more of tendered quantity against a single contract during last three years prior to, and excluding the tender opening date may be considered as responsive to SC Railways requirements for placement of bulk and regular order. However , in cases where the tenderers are having satisfactory past supply performance of tendered items for stock items /Non stock items with IR/PU, the supply performance data available in iMMS shall be taken in to consideration while evaluating the offers of the tenders. Similar item is defined as supply of glass or safety glass panels for windows of buses, coaches, railway rolling stock, automobiles or other passenger vehicles, including laminated glass, toughened/tempered glass and other safety glazing used in vehicle window assemblies, irrespective of variation in dimensions, thickness, shape.