Standard of care

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Tort law II
Part of the common law series
Negligent torts
Negligence  · Negligent hiring
Negligent entrustment  · Malpractice
Negligent infliction of emotional distress
Doctrines affecting liability
Duty of care  · Standard of care
Proximate cause  · Res ipsa loquitur
Calculus of negligence  · Eggshell skull
Vicarious liability  · Attractive nuisance
Rescue doctrine  · Duty to rescue
Comparative responsibility
Duties owed to visitors to property
Trespassers  · Licensees  · Invitees
Defenses to negligence
Contributory negligence
Last clear chance
Comparative negligence
Assumption of risk  · Intervening cause
Strict liability
Ultrahazardous activity
Product liability
Nuisance
Other areas of the common law
Contract law  · Property law
Wills and trusts
Criminal law  · Evidence
For the English law, see standard of care in English law.

In tort law, the standard of care is the degree of prudence and caution required of an individual who is under a duty of care. A breach of the standard is necessary for a successful action in negligence.

The requirements of the standard are closely dependent on circumstances. Whether the standard of care has been breached is determined by the trier of fact, and is usually phrased in terms of the reasonable person. It was famously described in Vaughn v. Menlove (1837) as whether the individual "proceed[ed] with such reasonable caution as a prudent man would have exercised under such circumstances".

In certain industries and professions, the standard of care is determined by the standard that would be exercised by the reasonably prudent manufacturer of a product, or the reasonably prudent professional in that line of work. Such a test (known as the 'Bolam Test') is used to determine whether a doctor is liable for medical malpractice.

A special standard of care also applies to children, who are held to the behavior that is reasonable for a child of similar age, experience, and intelligence.