49It follows that, where there is voluntary cooperation on the part of the interested parties, anti-dumping questionnaires are the Commission’s preferred means of conducting its anti-dumping investigations. It is only when an interested party does not cooperate in the anti-dumping investigation by refusing to grant access to the necessary information, by failing to provide that information within the prescribed period, or by significantly impeding the investigation that, pursuant to Article 18 of the basic regulation, the Commission may make its findings on the basis of the facts available.
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