This Practice Note considers the requirement for causation as part of establishing a viable claim in tort, including in negligence claims. It considers the aspects of factual causation: including the ‘but for’ test, evidencing it and its limits, inferring causation, consideration of special circumstances and scientific uncertainty, and those of legal causation: including the effective cause of the damage (eg third party act or omission and claimant’s own intervening conduct) and the remoteness of the damage sought to be recovered (foreseeability). For guidance on causation in the specific context of professional negligence claims, see Practice Note: Causation and remoteness in professional negligence claims. For guidance on causation in personal injury and clinical negligence claims, see Practice Notes: • Causation in personal injury claims • Causation and material contribution in clinical negligence claims Causation in tort—when required and what it entails In most torts, where a defendant breaches its duty towards the claimant, the defendant is only liable if the claimant can establish that the breach in question has resulted in some