Assess intervening acts and remoteness
Separate a break in responsibility from a foreseeable kind of damage and an unusually vulnerable claimant.
Section 4.1.4 · Tort causation and remoteness
Exam scope and assessment notes
A Level · section 4.1.4. Original educational scenarios about the law of England and Wales, checked on 14 October 2026. Model answers are formative reasoning, not advice about a real dispute, Cambridge marks or predicted grades. Read the exact statute, case and exam-year source where a rule is disputed or changes. A larger annotated authority bank, full unseen papers and specialist law-teacher review remain outstanding.
Before you begin
- Read a short source carefully and separate its rule from the facts
- Explain which element a fact supports and what is still uncertain
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What should a legal problem answer connect?
What you will learn
- Explain legal causation and intervening events
- Apply foreseeable kind of damage and the thin-skull principle
Trace legal responsibility
Factual causation is followed by legal limits on responsibility. An intervening act may break the chain where sufficiently independent and significant; mere occurrence after the breach is not enough. Responses to danger, medical treatment and third-party acts need their own foreseeability and responsibility analysis.
The claimant's conduct can raise either an intervening event or contributory negligence, depending on the rule and facts. Do not call every unwise response a complete break, or assume an initial breach remains responsible for all later independent harm. State which loss the chain concerns.
Distinguish kind and extent of harm
The Wagon Mound approach ordinarily asks whether the kind of damage was reasonably foreseeable. The exact mechanism or full severity need not always be foreseen where the damage is of the relevant kind, illustrated by Hughes. A wholly different kind of harm raises a different issue.
Under the thin-skull principle, once the relevant personal-injury kind is within liability, unusual vulnerability does not ordinarily reduce responsibility merely because the extent is unexpectedly severe, illustrated by Smith v Leech Brain. This does not remove duty, breach, factual causation or the initial remoteness requirement. Scope-of-duty limits may also matter, especially in assumed-responsibility cases.
Sources for this lesson
Pause and explain
Does every act occurring after the breach automatically break causation?
Worked example
A foreseeable burn becomes unusually severe because of a claimant's existing vulnerability. A student excludes all additional loss solely because its extent was surprising. Evaluate.
Show the worked solution
- The foreseeable kind is a burn.
- Severity reflects the claimant's vulnerability.
- Apply thin-skull reasoning after the other elements.
Answer Unexpected extent alone does not exclude the additional injury under the thin-skull principle once the relevant liability and causal requirements are established. The answer must distinguish foreseeable kind from unusual severity rather than demand prediction of every consequence.
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Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Guided: Separate kind and extent in the burn example.
Give me a hint
Use foreseeable burn and severe consequence.
Compare my reasoning
- Identify the foreseeable injury kind.
- Identify unusual extent.
- Apply the vulnerability principle with prior elements intact.
The burn's kind is foreseeable while its extent is unusually severe. Thin-skull reasoning can preserve responsibility for that extent, but the duty, breach and causal link still require proof.
Look for these in your work
- Identifies kind
- Identifies extent
- Preserves other elements
Independent: A later reasonable rescue response contributes to damage. Is the timing alone enough to sever responsibility?
Give me a hint
A response to danger may remain within the chain.
Compare my reasoning
- Identify why the response occurred.
- Assess reasonableness and foreseeability.
- Apply the relevant chain rule.
Later timing alone does not sever responsibility. A reasonable response to the danger may remain within the causal chain, depending on the precise harm and governing rule; independence and significance need analysis.
Look for these in your work
- Uses response context
- Uses reasonableness
- Rejects timing alone
Application: Contrast unusual severity of a foreseeable injury with an entirely different unforeseeable kind of damage.
Give me a hint
Thin skull concerns extent after the relevant threshold.
Compare my reasoning
- Identify each damage kind.
- Apply the remoteness threshold.
- Use vulnerability only where appropriate.
Unusual severity of the relevant foreseeable injury can fall within thin-skull responsibility. A wholly different unforeseeable kind first raises the remoteness limit; vulnerability cannot automatically convert it into a recoverable loss.
Look for these in your work
- Distinguishes kinds
- Applies threshold
- Limits vulnerability rule
Common mistakes
- Treating every later event as a break
- Demanding exact prediction of severity
- Using thin skull to bypass causation
What can you explain now?
Does every act occurring after the breach automatically break causation?
Compare with the explanation
No
Independence, significance and the applicable responsibility principles must be assessed.
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Make it stick
Does every act occurring after the breach automatically break causation?
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