Provisional assessment in anti circumvention investigations allows guarantees from importers pending government decision on duty applicability. The rules authorize provisional assessment and the requirement of a guarantee in anti circumvention investigations to secure duties pending the Central Government's decision; they replace references to Collector of Customs with Principal Commissioner or Commissioner of Customs and allow the term 'domestic industry' to be interpreted as referring to the rest of the producers. The amendments also mandate that specified reviews be completed at least three months prior to expiry of the duty under review and make procedural rules applicable mutatis mutandis to such reviews.