Countervailing duty absorption investigations permit evidence-based or suo motu initiation, provisional import assessment, and limited margin recomputation. Countervailing duty absorption investigations may begin on a sufficiently evidenced application by the domestic industry or another interested party, or suo motu on information from customs authorities or other sources. The exporting country's Government must be notified before initiation. Imports may undergo provisional assessment and importers may be required to provide a guarantee pending decision. The review is limited to recomputation of subsidy and injury margins, with applicable evidentiary and procedural rules applied correspondingly. Investigations ordinarily conclude within six months, extendable by up to three months in special circumstances.