The law of negligence imposes a duty of care upon persons whose conduct may foreseeably harm others. The foundational test was established in the English case of Donoghue v. Stevenson (1932), in which Lord Atkin formulated the ‘neighbour principle’: you owe a duty of care to those who you can reasonably foresee will be affected by your act or omission. The neighbour is not the legal neighbour (one who is physically adjacent) but the person who is sufficiently proximate to be harmed by carelessness.
For a negligence claim to succeed, three elements must be established: (i) the defendant owed the claimant a duty of care; (ii) the defendant breached that duty; and (iii) the breach caused the claimant’s loss or damage. The element of causation requires that the defendant’s breach be the actual and proximate cause of the loss. If the loss would have occurred even without the defendant’s breach, causation is not established. The standard for breach is what a reasonable person in the defendant’s position would have done — not what an expert or the most cautious person would do, but the ordinarily prudent person.
A defendant who establishes that the claimant contributed to their own injury through their own carelessness may rely on the defence of contributory negligence, which may reduce but not eliminate the damages awarded to the claimant.