The fundamental distinction in liability law
Objective: Distinguish between obligation of means and obligation of result in order to properly qualify your suppliers' commitments and lighten your burden of proof.
This distinction, derived from case law and legal doctrine, determines who bears the burden of proof and conditions the engagement of the supplier's liability.
Sources
- Art. 1231-1 C. civ. - Damages for non-performance
- Doctrinal distinction from René Demogue (Treatise on Obligations, 1925)
⚡ Obligation of RESULT
Definition: The supplier guarantees a precise and defined result
Proof: The buyer only needs to prove non-achievement of the result → The breach is presumed
Typical cases:
- Supply of goods conforming to specifications
- Manufacturing according to specifications
- Firm delivery deadline
- Guaranteed availability (SLA)
🔍 Obligation of MEANS
Definition: The supplier commits to using diligent efforts, without guaranteeing the result
Proof: The buyer must prove the supplier's negligence → Heavier burden of proof
Typical cases:
- Consulting and auditing
- Maintenance with variable factors
- Consulting services
- Research and development
💡 Practical tip: As a buyer, systematically qualify commitments as obligations of result when possible. For intellectual services where this is not realistic, define precise KPIs and regular reporting that will facilitate proof of negligence if needed.