Where a party succeeds on a specific argument or question before the court, the usual rule that costs follow the event applies to the costs occasioned by that argument, even if: (1) the ultimate effect of the court's determination on the proceedings as a whole is uncertain; (2) the determination may have adverse consequences for both parties; or (3) the proceedings will continue and claims may be amended. A costs order can be properly limited to 'the costs occasioned by the argument' on a specific question, as distinct from the costs of the entire proceedings. An appellate court should not speculate on the fate of claims and counterclaims that remain to be determined by the lower court following its determination of a specific legal question.