Standard Input Output Norms amendment updates SIONs, revising product-specific input lists and import entitlement rules. The Director General of Foreign Trade amends the Handbook of Procedures, Vol.2 by deleting, substituting and adding Standard Input Output Norms (SION). The notice revises SION entries across Chemicals and Allied Products, Engineering Products and Textile Products by changing export/import descriptions, adjusting permitted input quantities, adding alternate inputs and OR-clauses, and inserting new SIONs with detailed input lists; some entries specify net-to-net accountability clauses, pro rata adjustments for metal content, and packing policy treatment.