David Lowe
Partner
Head of Commercial Contracts
Co-Chair of ThinkHouse
Article
8
When negotiating commercial contracts, parties may choose to qualify an obligation by only agreeing to attempt to achieve it - rather than agreeing absolutely to do so. This may be because fulfilment of the obligation depends on the co-operation of a third party or other matters beyond a party's control. Endeavours clauses are commonly used for this purpose but as they do not import absolute obligations, there is some uncertainty about what exactly they require the promising party (the obligor) to do.
We consider:
Broadly speaking, a party is required to use no less than its best efforts to produce the desired results in the circumstances. This has been held to mean that such steps are all the steps which a prudent, determined and reasonable person, acting in their own interests and desiring to achieve that result, would take.
Although this is an onerous obligation, it is not regarded by the courts as an absolute one and is subject to reasonableness.
This requires the obligor to achieve an even balance between its contractual obligation to the obligee and the obligor's own commercial interests i.e. it is obliged to pursue a reasonable course to achieve the objective.
There are four key characteristics:
This obligation is commonly seen as a compromise between best and reasonable endeavours but there is the least certainty over its meaning. What steps have to be taken will depend on the circumstances and the obligation may exhibit the characteristics of both best and reasonable endeavours. Case law suggests uncertainty as to whether:
There are several variations of the three most commonly used endeavours clauses: "commercially reasonable endeavours", "reasonable commercial endeavours," and "utmost endeavours." The former phrases are interpreted as being used to "soften" a reasonable endeavours obligation, whilst the latter is commonly seen as an advancement on a best endeavours clause. However, whether it is possible to "dress-up" endeavours clauses in this way remains uncertain.
There will always be an element of uncertainty as to what is being agreed to when using endeavours clauses. Importantly, although the meaning of the clause must be construed using the normal rules of contract interpretation (i.e as against the relevant contractual and factual background, including the commercial context at the time the contract is formed), whether or not the obligation has been satisfied is considered against the position at the time of performance and is therefore fact sensitive.
Consideration should be given to the following:
By following the above practical points, there will be less scope for argument as to what was intended and, consequently, whether what was intended has been achieved - or not.
CECI NE CONSTITUE PAS UN AVIS JURIDIQUE. L'information qui est présentée dans le site Web sous quelque forme que ce soit est fournie à titre informatif uniquement. Elle ne constitue pas un avis juridique et ne devrait pas être interprétée comme tel. Aucun utilisateur ne devrait prendre ou négliger de prendre des décisions en se fiant uniquement à ces renseignements, ni ignorer les conseils juridiques d'un professionnel ou tarder à consulter un professionnel sur la base de ce qu'il a lu dans ce site Web. Les professionnels de Gowling WLG seront heureux de discuter avec l'utilisateur des différentes options possibles concernant certaines questions juridiques précises.
Gowling WLG est un cabinet juridique international constitué des membres de Gowling WLG International Limited, une société à responsabilité limitée par garanties enregistrée en Angleterre, ainsi que leurs affiliés respectifs. Les membres et affiliés constituent des entités autonomes et indépendantes. Gowling WLG International Limited promeut, facilite et coordonne les activités de ses membres, mais ne fournit pas elle-même de services aux clients. Pour en savoir davantage sur notre structure, consultez notre page Avis juridique.
© 2026 Gowling WLG Tous droits réservés