Where the quality of performance is neither fixed by, nor determinable from, the contract a party is bound to render a performance of a quality that is reasonable and not less than average in the circumstances. 



Standards have been set in Article 5.1.4 concerning the exercise of “best efforts”, but quality of performance is a wider problem addressed by Article 5.1.6. If goods are to be supplied, or services rendered, it is not sufficient to supply those goods or to render those services; they must also be of a certain quality.


The contract will often be explicit as regards the quality due (“grade 1 oil”), or it will provide elements making that quality determinable. In other cases, the rule established by Article 5.1.6 is that the quality must be “reasonable and not less than average in the circumstances”. Two criteria are thus combined.




1. A undertakes to build a hotel next to a busy railway station. The contract provides for “adequate sound isolation”, the quality of which is not more precisely determined. It is, however, determinable from the contract that the sound isolation must meet the high standards needed in view of the hotel’s proximity to a railway station.


1. Performance must be of average quality


The minimum requirement is that of providing goods of average quality. The supplier is not bound to provide goods or services of superior quality if that is not required by the contract, but neither may it deliver goods or services of inferior quality. This average quality is determined according to the circumstances, which normally means that which is available on the relevant market at the time of performance (there may for example have been a recent technological advance). Other factors may also be of relevance, such as the specific qualifications for which the performing party was chosen.




2. A buys 500 kgs. of oranges from B. If the contract says nothing more precise, and no other circumstances call for a different solution, those oranges may not be of less than average quality. Average quality will however suffice unless it is unreasonably defective.


2. Performance must be reasonable


The additional reference to reasonableness is intended to prevent a party from claiming that it has performed adequately if it has rendered an “average” performance in a market where the average quality is most unsatisfactory and is intended to give the judge or arbitrator an opportunity to raise those insufficient standards.




3. A company based in country X organises a banquet to celebrate its 50th anniversary. Since the cuisine in country X is mediocre, the company orders the meal from a renowned restaurant in Paris. In these circumstances the quality of the food provided must not be less than the average standards of the Parisian restaurant. It would clearly not be sufficient simply to meet the average standards of country X.

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