(1) Where the parties to a contract have not agreed with respect to a term which is important for a determination of their rights and duties, a term which is appropriate in the circumstances shall be supplied. 


(2) In determining what is an appropriate term regard shall be had, among other factors, to 


(a) the intention of the parties; 


(b) the nature and purpose of the contract; 


(c) good faith and fair dealing; 


(d) reasonableness.




1. Supplying of omitted terms and interpretation


Articles 4.1 to 4.7 deal with the interpretation of contracts in the strict sense, i.e. with the determination of the meaning which should be given to contract terms which are unclear. This Article addresses a different though related issue, namely that of the supplying of omitted terms. Omitted terms or gaps occur when, after the conclusion of the contract, a question arises which the parties have not regulated in their contract at all, either because they preferred not to deal with it or simply because they did not foresee it.


2. When omitted terms are to be supplied


In many cases of omitted terms or gaps in the contract the Principles will themselves provide a solution to the issue (see, for example, Articles 5.1.6 (Determination of quality of performance), 5.1.7 (Price determination), 6.1.1 (Time of performance), 6.1.4 (Order of performance), 6.1.6 (Place of performance) and 6.1.10 (Currency not expressed). See also, in general, Article 5.1.2 on implied obligations). However, even when there are such suppletive, or “stop-gap”, rules of a general character they may not be applicable in a given case because they would not provide a solution appropriate in the circumstances in view of the expectations of the parties or the special nature of the contract. This Article then applies.


3. Criteria for the supplying of omitted terms


The terms supplied under this Article must be appropriate to the circumstances of the case. In order to determine what is appropriate, regard is first of all to be had to the intention of the parties as inferred from, among other factors, the terms expressly stated in the contract, prior negotiations or any conduct subsequent to the conclusion of the contract.




1. The parties to a construction contract agree on a special interest rate to be paid by the purchaser in the event of delay in payment of the price. Before the beginning of the work, the parties decide to terminate the contract. When the constructor delays restitution of the advance payment the question arises of the applicable interest rate. In the absence of an express term in the contract dealing with this question, the circumstances may make it appropriate to apply the special interest rate agreed for delay in payment of the price by the purchaser also to delay in restitution by the constructor.


If the intention of the parties cannot be ascertained, the term to be supplied may be determined in accordance with the nature and purpose of the contract, and the principles of good faith and fair dealing and reasonableness.




2. A distribution franchise agreement provides that the franchisee may not engage in any similar business for a year after the termination of the agreement. Although the agreement is silent on the territorial scope of this prohibition, it is, in view of the parti¬cular nature and purpose of the franchise agreement, appropriate that the prohibition be restricted to the territory where the franchisee had exploited the franchise.

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