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FACTS: In a civil action for damages arising from a steel-supply contract, P sues D. S, who owns a competing steel-supply business, is not related to either party but stands to gain a substantial share in a future supply contract with D if D prevails in the case. S testifies that the steel was delivered in accordance with the contract and that the invoices presented by P are genuine. There is no order disqualifying S, and he is not shown to be legally incompetent. (a) State the controlling doctrine on disqualification of witnesses on account of interest or relationship. Is S disqualified per se, or is his testimony admissible but subject to caution and possible corroboration? (b) Apply the doctrine to S’s testimony: Is his testimony about the contract and the invoices admissible? What weight should the court give to his testimony, and what corroborating evidence would be necessary to prove the steel contract and the damages?