Standard Input Output Norms: amendments expand and correct SION entries, adding product-specific import export norms and procedural notes. Amendments to the Standard Input Output Norms require textual corrections, deletions and additions in the Handbook of Procedures, Vol.2, revising existing SION entries across Chemicals and Allied, Engineering and Textile products and inserting new entries via Annexures A, B, C and D; they prescribe detailed product specific input output ratios, allowed import items, and conditions such as CIF value restrictions and AU condition fuel allowances for eligible composite textile units.