Standard Input Output Norms amendments update permitted input items and quantities for exports, including alternate inputs and calculation notes. Amendments to the Standard Input Output Norms revise, add and delete SION entries in the Handbook of Procedures, Vol.2, specifying updated input items and permitted quantities for Chemicals, Engineering and Plastic products; introduce alternate input options, multipart input bills of materials, calculation notes for pro rata adjustments and calorific conversions for energy inputs, and corrections to item descriptions and applicability notes for scheme exclusions.