Standard Input-Output Norms amended to add and revise product-specific import-export norms across chemicals, engineering, plastics, textiles. Directorate amends the Standard Input-Output Norms in the Handbook of Procedures by making targeted amendments, deletions, corrections and additions to SION entries and by adding new entries across Chemicals and Allied Products, Engineering Products, Plastic Products and Textile Products; each SION entry specifies export items paired with enumerated permissible import inputs and allowed quantities or formulae, with some norms substituted, shifted between groups, or accompanied by conditional notes, and these changes are to be incorporated into the Handbook SION tables.