LAWS5024 Chap.9 Causation and Scope of Liability
Causation and Scope of Liability
Causation in negligence has two distinct stages. Factual causation asks whether breach was a necessary condition of harm, while scope of liability asks whether responsibility should extend to that harm. This chapter applies sections 5D and 5E, counterfactual reasoning, remoteness, failure-to-warn principles, intervening events and later illness or wrongdoing without collapsing them into one conclusion.
What this chapter covers
- 01
Counterfactual factual causation
- 02
Necessary conditions and evidence
- 03
Standard of proof
- 04
Scope of liability and remoteness
- 05
Failure-to-warn claims
- 06
Intervening acts
- 07
Later tortious acts and illness
Worked example · free
A missed warning and an unrelated collision
- +2Ask what the patient would probably have done if properly warned.
- +2Use that counterfactual to decide whether the omission was a necessary condition of being at the location.
- +2Define the risk that made warning necessary and compare it with the harm that occurred.
- +2Assess the speeding vehicle as a later independent act and conclude separately on scope.
Key terms
- Factual causation
- The inquiry into whether breach was a necessary condition of the claimant's harm.
- Counterfactual
- The hypothetical world in which reasonable care was taken and the likely outcome is tested.
- Scope of liability
- The inquiry into whether legal responsibility should extend to harm factually caused.
- Novus actus
- A later event capable of breaking the chain of legal responsibility in appropriate circumstances.
- Failure to warn
- A negligence claim requiring close comparison between the undisclosed risk, claimant response and harm realised.
Causation and Scope of Liability FAQ
What is the difference between cause and scope?
Factual causation asks whether harm probably would have been avoided without the breach. Scope asks whether the defendant should bear legal responsibility for the harm that occurred. A claimant may satisfy the counterfactual but fail because the harm falls outside the relevant risk.
Does later wrongdoing always break the chain?
No. Ask whether the later act was independent, unreasonable or instead a foreseeable response within the risk created by the defendant. Rescue and medical treatment may preserve responsibility, while wholly independent misconduct can support a scope limit.
How should a failure-to-warn claim be analysed?
Identify the risk requiring disclosure, determine what the claimant probably would have done if warned, and ask whether that particular risk materialised. Avoid treating every consequence of the claimant's later choices as automatically within the warning duty.
What evidence supports the counterfactual?
Use contemporaneous statements, established habits, available alternatives, expert evidence and surrounding circumstances to infer what probably would have happened with reasonable care. A claimant's later assertion matters but should not be treated as conclusive by itself.
Can several conditions all be factual causes?
Yes. A harm can depend on more than one condition. Analyse what each breach changed and whether the harm probably would have occurred without it. Multiple causes do not remove the need for evidence or the separate scope inquiry.
How does remoteness relate to scope of liability?
Remoteness helps determine whether responsibility appropriately extends to the kind of harm that occurred. Identify the risk that made conduct negligent and compare it with the actual injury. Avoid using physical sequence alone as the legal test.
Does medical treatment break causation?
Not automatically. Treatment may be a foreseeable response to injury, while extraordinary independent conduct can raise a stronger intervening-act argument. Apply the relevant authority to the nature of the treatment and the risk created by the original breach.
How do I prove the counterfactual without guessing?
Identify the omitted precaution and construct the alternative sequence in which it was taken. Use records, ordinary practice, witness evidence and any admissible expert material to support what probably follows. In a warning case, evidence about the claimant's likely response is essential; in a physical-precaution case, effectiveness matters.
State uncertainty openly and keep the probability conclusion separate from the later question whether the actual harm falls within the appropriate scope of the defendant's responsibility.
Exam move
For every negligence problem, copy the breach into a causal ledger and write the counterfactual precaution beside it. Record the evidence for what probably happens in that alternative world. Under a separate scope heading, name the risk that made conduct negligent, the type of harm and any later event. Practise scenarios where factual causation succeeds but scope fails, because that contrast makes the distinction memorable.
In failure-to-warn questions, match the undisclosed risk to the injury exactly. End by checking that an intervening-event conclusion is supported by authority rather than intuition.
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