Standard Input-Output Norms updated to add new export-import entries and revise input specifications across multiple product groups. Public Notice amends the Handbook of Procedures, Vol.2 by adding new SION entries across Chemicals, Engineering, Food, Plastic and Textile product groups and prescribing detailed input-output norms in Annexures B-F. The amendments substitute, correct or restore import item descriptions and quantities, add alternative allowable inputs subject to plant capability or user conditions, and include notes on composition limits, permitted wastage allowances and specified validity periods for certain norms.