Standard Input Output Norms updated: corrections, new chemical/engineering/textile entries and licence rules for alternative inputs. Amendments to Handbook of Procedures Vol.2 revise Standard Input-Output Norms by correcting existing entries, substituting input lists for specified export items, and adding new SION entries in Chemical, Engineering, Textile and Miscellaneous product groups with detailed import-item compositions and input quantities. The notice authorises licences to permit alternative inputs in the same prescribed ratios and allows licences for galvanised export products to be granted for ungalvanised export by excluding zinc.