Anti-dumping investigation initiation requires domestic industry support, sufficient evidence of dumping and injury, or justified suo motu action.

Anti-dumping investigations ordinarily require a written application by or on behalf of the domestic industry, supported by evidence of dumping, injury where applicable, and causal link. The designated authority must verify producer support and the sufficiency of evidence before initiation. Supporting producers must meet the minimum production threshold, and majority support is determined among producers expressing support or opposition. The investigation period is ordinarily twelve months, subject to prescribed limits and recorded reasons. A suo motu investigation may be initiated on sufficient information, with prior notification to the exporting country.

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