Input-output norms require proportional pig iron import where export components contain less than wholly pig iron, ensuring input-use compliance. The Foreign Trade Policy prescribes input-output norms for cast iron machined parts, requiring pig iron as the primary input. If pig iron is less than wholly but at least ninety percent by weight of the export product, the pig iron import requirement must be proportionately reduced. Applicants must determine input proportions, document usage, and ensure imported goods correspond to inputs actually used in the exported product.