This document discusses the key elements of the tort of negligence, which is the most important area of modern tort law. The tort of negligence involves a breach of duty by the defendant that causes foreseeable harm to the plaintiff. It is harder to define than other torts because it deals with how one acts rather than a specific action. The elements of negligence include a legal duty of care owed by the defendant, a breach of that duty, and damages caused to the plaintiff by the breach. The document also discusses the expansion of negligence liability over time, including key cases like Home Office v Dorset Yacht Co and Anns v Merton London Borough Council that changed the approach to determining duty of care.