This chapter discusses the law on standard of care and breach of duty. To establish that the duty of care has been breached, the standard of care must first be found and then it must be decided if that standard was reached in the circumstances. The general standard of care is objective: the ‘reasonable person’ standard. Variations in the standard of care regarding children and the more skilled or professional are discussed, as are those pertaining to sport and the medical profession. Proof of breach must be established by the claimant on the balance of probabilities; occasionally with the benefit of the evidential tool of res ipsa loquitur.