Safeguard measures depend on defined import increases, critical circumstances, interested parties, and qualifying articles under customs rules. Rule 2 defines the terms governing safeguard measures under the Customs Tariff framework. Critical circumstances involve increased imports, measured absolutely or relative to domestic production, causing or threatening serious injury to the domestic industry, where delay in imposing a provisional safeguard measure would cause irreparable damage. Interested parties include exporters, foreign producers, importers, relevant associations, the exporting country's government, and Indian producers of like or directly competitive articles. Safeguard measures include safeguard duty, tariff-rate quotas, and other authorised measures. The rule also defines like articles, specified countries, and the WTO, while assigning undefined expressions the meanings given in the Customs Tariff Act, 1975.