Input-output norms modification updates SIONs, adding sectoral entries and defining permitted import entitlements for exports. Director General of Foreign Trade amends the Handbook of Procedures Vol.2 under Paragraph 2.4 by substituting, correcting and adding Standard Input Output Norms (SION). Annexure A contains amendments and corrections to existing SION entries across chemical, engineering, plastics, textile and other sectors; Annexures B-F add new sectoral SIONs specifying export items and their allowed import inputs and quantities, including alternate input baskets and pro rata adjustment rules. A new general note for leather products prescribing input quantities for Dual Density PU/TPU soles is also added.