Duty of Care: Understanding the First Element of Negligence

Duty of Care: Understanding the First Element of Negligence

Before a person can ordinarily be held liable for negligence, there is a fundamental question that must be answered:

Did the defendant owe the plaintiff a duty of care?

This question comes before breach, causation, and damages.

A person may behave carelessly. That carelessness may even create a risk of harm. But unless the law recognizes a duty owed to the plaintiff, a negligence claim may fail at the first stage.

This makes duty of care one of the foundational concepts of Tort Law.

The basic structure of negligence is traditionally expressed as:

Duty → Breach → Causation → Damages

The duty requirement asks whether the defendant had a legally recognized obligation to take reasonable care in relation to the plaintiff.

Cornell Law School’s Legal Information Institute explains that negligence generally requires a duty owed by the defendant to the plaintiff and that the nature of the duty depends on the circumstances and applicable law.

The concept sounds simple.

In practice, however, duty can be one of the most difficult questions in negligence law.

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What Is a Duty of Care?

A duty of care is a legal obligation to act with an appropriate level of care toward another person or to avoid conduct that creates an unreasonable risk of harm.

In many ordinary negligence cases, the duty is described as a duty to exercise reasonable care under the circumstances.

For example:

A driver operating a vehicle on a public road generally owes other road users a duty to operate the vehicle with reasonable care.

A store may owe customers duties concerning reasonably foreseeable dangers on its premises.

A professional may owe a client or patient duties arising from the professional relationship.

A manufacturer may owe duties concerning the safety of products placed into the stream of commerce.

These duties do not necessarily arise because the parties entered into a contract.

They arise because the law recognizes a relationship or circumstance in which reasonable care is required.

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Why Duty Comes First

Imagine that A accidentally knocks over a flowerpot.

The flowerpot falls and injures B.

To determine whether A is liable for negligence, it is not enough to establish:

• that A caused the accident;
• that B was injured; and
• that A could have behaved differently.

The legal analysis must first ask whether A owed B a duty of care.

If the law recognizes no duty toward B in the circumstances, the negligence claim may fail regardless of the subsequent analysis.

This illustrates an essential principle:

Negligence is not simply unreasonable conduct. It is unreasonable conduct in violation of a legally recognized duty.

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Duty Is a Legal Question

Duty is generally determined by law, rather than simply by the defendant’s personal beliefs.

A defendant cannot ordinarily escape a legal duty by saying:

“I didn’t think I owed that person anything.”

Similarly, a plaintiff cannot create a duty merely by asserting that the defendant should have acted differently.

Courts determine whether a duty exists by applying the relevant legal rules to the circumstances.

The exact approach varies among jurisdictions.

Courts may consider factors such as:

• the relationship between the parties;
• foreseeability of harm;
• the nature of the defendant’s conduct;
• the plaintiff’s status;
• public policy;
• the defendant’s ability to prevent the harm;
• the burden of precautions;
• and other circumstances recognized by the jurisdiction.

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The General Duty of Reasonable Care

In many ordinary negligence cases, the law imposes a general duty to exercise reasonable care.

This principle is particularly familiar in automobile accidents.

Suppose A drives a car through an intersection.

A owes other road users applicable duties of reasonable care.

A must generally operate the vehicle in a manner consistent with the circumstances.

For example, reasonable care may require A to:

• observe traffic signals;
• maintain an appropriate speed;
• pay attention to traffic;
• respond to hazards;
• maintain control of the vehicle;
• and take reasonable precautions against foreseeable risks.

A failure to do so may constitute a breach of duty.

But remember the sequence:

First: Does the duty exist?

Second: What standard of care applies?

Third: Did the defendant breach it?

This distinction is important because duty and breach are related but not identical.

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Duty vs. Breach

These concepts are frequently confused.

They should be separated.

Duty

The law asks:

Was the defendant legally required to exercise reasonable care toward the plaintiff?

Breach

The law then asks:

Did the defendant fail to exercise the required level of care?

Consider a driver.

The driver owes other road users a duty of reasonable care.

That is the duty.

If the driver sends a text message while driving and causes an accident, texting may constitute the breach.

Thus:

Duty = What the law requires

Breach = Failure to meet that requirement

This distinction becomes especially important in difficult negligence cases.

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Duty Is Not the Same as a Moral Obligation

A person may have a moral reason to help another person without having a corresponding legal duty.

For example, imagine that a person sees a stranger struggling in a river.

Many people would consider helping morally admirable.

But whether the person has a legal duty to rescue the stranger is a separate question.

Tort law does not automatically convert every moral obligation into a legal obligation.

This distinction between morality and law is one of the most important philosophical features of duty doctrine.

The law must decide when a person’s freedom to remain inactive gives way to a legally enforceable obligation to act.

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The No-Duty-to-Rescue Principle

One of the most important rules in negligence law concerns nonfeasance—the failure to act.

In many jurisdictions, a person generally has no broad duty to rescue another stranger from danger merely because the person could do so.

For example:

A sees B drowning.

A could potentially help.

But if A did not create the danger and has no special relationship with B, the law may not impose a general duty to rescue.

This principle is subject to significant exceptions.

The important distinction is between:

misfeasance

and

nonfeasance.

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Misfeasance and Nonfeasance

Misfeasance

The defendant engages in conduct that creates or increases a risk of harm.

Example:

A drives a car carelessly and hits B.

Nonfeasance

The defendant fails to take action to prevent harm.

Example:

A sees B in danger but does nothing.

Tort law has traditionally been more willing to impose duties concerning harmful conduct than duties requiring people to affirmatively rescue others.

This is one reason the existence of a duty can become complicated.

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Why Doesn’t Everyone Owe Everyone a Duty to Rescue?

At first glance, a universal duty to rescue might seem morally attractive.

But tort law must also consider practical and institutional questions.

A universal legal duty to rescue could potentially:

• impose extensive obligations on ordinary people;
• create uncertainty about what assistance is legally required;
• expose people to liability for unsuccessful rescue attempts;
• interfere with individual autonomy;
• and require courts to define how far one person’s obligations toward strangers extend.

The law therefore generally distinguishes between:

not causing a danger

and

creating or increasing a danger.

That distinction has shaped the development of duty doctrine in common-law negligence.

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When a Duty to Act May Arise

Although there is often no general duty to rescue a stranger, a duty to act can arise under particular circumstances.

Examples may include situations involving:

• special relationships;
• contractual relationships;
• voluntarily assumed responsibilities;
• creation of a risk;
• control over a dangerous situation;
• custody or supervision;
• statutory obligations;
• or other circumstances recognized by law.

The precise categories vary by jurisdiction.

The important principle is that a duty to act can arise from the relationship or circumstances even when no general duty to rescue exists.

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Creating the Danger

One of the clearest circumstances in which a duty may arise is when the defendant creates or increases the risk of harm.

Suppose A accidentally knocks B into a swimming pool.

A did not intend to hurt B.

But A has created the dangerous situation.

A may therefore have obligations to take reasonable steps to prevent further harm.

This is fundamentally different from A merely witnessing a danger created entirely by someone else.

The law can be more willing to impose an affirmative duty when the defendant’s own conduct has contributed to the danger.

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Voluntary Assumption of Responsibility

A duty can also arise when a person voluntarily undertakes to provide assistance or protection.

Imagine that A sees B in danger and decides to help.

A begins providing assistance but does so negligently, making B’s situation worse.

The fact that A was not originally required to intervene does not necessarily mean that A can never become legally responsible once A undertakes the task.

This principle reflects an important idea:

A person who voluntarily assumes responsibility may acquire legal obligations concerning the manner in which that responsibility is carried out.

The precise requirements vary by jurisdiction.

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Special Relationships

Certain relationships can create duties of care that do not exist between strangers.

Examples can include relationships involving:

• common carriers and passengers;
• innkeepers and guests;
• employers and employees;
• schools and students;
• custodians and people in their care;
• businesses and customers;
• healthcare professionals and patients;
• and other relationships recognized by applicable law.

The existence and scope of these duties vary.

The common feature is that the relationship itself can justify imposing responsibilities concerning the protection of another person.

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The Defendant’s Relationship With the Plaintiff

Duty analysis therefore frequently begins with the relationship between the parties.

Ask:

Who are the plaintiff and defendant in relation to one another?

Are they:

• strangers?
• drivers?
• employer and employee?
• doctor and patient?
• business and customer?
• landlord and tenant?
• parent and child?
• school and student?
• manufacturer and consumer?
• professional and client?

The answer can fundamentally change the duty analysis.

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Foreseeability and Duty

Foreseeability is frequently relevant to duty analysis.

The question is often whether the type of harm suffered by the plaintiff was sufficiently foreseeable in light of the defendant’s conduct and circumstances.

Suppose a property owner knows that a dangerous condition exists in an area where customers regularly walk.

An injury to a customer may be foreseeable.

The argument for recognizing a duty is therefore stronger.

But foreseeability does not automatically establish duty.

It is one factor within a broader legal analysis.

Different jurisdictions place different emphasis on foreseeability when determining duty.

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Foreseeability Does Not Mean Predictability

Foreseeability does not require the defendant to predict the exact sequence of events.

Suppose a driver negligently speeds through a crowded intersection.

The driver does not need to predict:

“At 3:14 p.m., a blue car will approach from the east and I will hit the driver’s left door.”

The law generally deals with the foreseeability of types or general risks of harm, not perfect prediction of every factual detail.

This distinction becomes particularly important when analyzing both duty and proximate cause.

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The Scope of the Duty

Even when a duty exists, the next question is:

What exactly did the duty require?

A driver may owe a duty of reasonable care.

But reasonable care can vary according to:

• weather;
• traffic;
• visibility;
• road conditions;
• speed;
• emergency circumstances;
• and other facts.

Similarly, a property owner may owe customers duties concerning dangerous conditions, but the precise obligation may depend on:

• whether the condition was known;
• whether it was reasonably discoverable;
• how long it existed;
• whether the risk was foreseeable;
• and whether reasonable precautions were available.

Thus, duty does not always provide a complete answer.

It establishes the legal obligation that the court must then define and apply.

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Duty and Standard of Care

Duty and standard of care are closely connected but should remain conceptually distinct.

Duty

What obligation does the law impose?

Standard of care

What level of care satisfies that obligation?

For example:

A driver owes other road users a duty of reasonable care.

The standard may require conduct consistent with what a reasonably prudent driver would do under the circumstances.

The first question establishes the obligation.

The second determines how that obligation is measured.

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Different Standards for Different Defendants

The reasonable-person standard can be modified by the circumstances or characteristics recognized by law.

For example, children may be judged under standards appropriate to children of similar age and experience, subject to jurisdiction-specific rules.

Professionals may be evaluated according to professional standards.

People engaged in certain activities may be subject to particular statutory or regulatory requirements.

Thus, the existence of a duty does not mean that every defendant is judged according to precisely the same standard.

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Professionals and Professional Duties

Professionals often have specialized duties arising from their relationships with clients or patients.

A physician may owe a patient duties concerning the provision of medical care.

A lawyer may owe a client professional duties.

An accountant may owe duties associated with professional services.

An engineer may owe duties concerning professional work affecting safety.

In such cases, determining breach can require expert testimony or evidence concerning professional standards.

The duty itself may be straightforward:

Provide services with the legally required level of professional care.

But determining what reasonable professional care required can be highly technical.

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Premises and Property

Property relationships provide another major category of duty.

A person who owns or controls property may have duties concerning conditions on that property.

The scope of those duties can depend on:

• the plaintiff’s status;
• the nature of the property;
• the dangerous condition;
• whether the defendant knew or should have known of it;
• whether the risk was foreseeable;
• and applicable statutes and case law.

This is one reason premises liability is often treated as a specialized area within negligence law.

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Landowners and Different Entrants

Traditional common law sometimes classified people entering land as:

• trespassers;
• licensees;
• or invitees.

Those classifications could affect the landowner’s duty.

Modern law has modified these rules in many jurisdictions, and statutory reforms may apply.

Nevertheless, the historical categories remain important for understanding the development of premises-liability law.

The central question remains:

What duty did the property owner or occupier owe to this particular person under the applicable law?

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Children and Duty

Children raise difficult questions because the law recognizes that children do not possess the same judgment and experience as adults.

A child may therefore be subject to a different standard of care.

But duty and standard of care should still be separated.

The question of duty asks whether the defendant had a legal obligation toward the plaintiff.

The standard-of-care question asks what reasonable conduct required in the circumstances.

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Emergency Situations

Emergency circumstances can affect the negligence analysis.

A person responding to an unexpected emergency may not be judged as though the person had unlimited time for reflection.

The circumstances confronting the defendant matter.

This does not necessarily mean that emergencies eliminate negligence liability.

Rather, the emergency may influence what reasonable care required.

For example, a driver suddenly confronted with an unavoidable hazard may have fewer reasonable options than a driver who had ample time to react.

Reasonableness is always connected to the circumstances known to the defendant at the relevant time.

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Statutes and Regulations Can Affect Duty

Legislatures and administrative agencies can establish rules that influence negligence law.

A statute may:

• create a duty;
• define a required precaution;
• establish a safety requirement;
• regulate professional conduct;
• or otherwise affect the legal standard.

A statutory violation can sometimes support a negligence-per-se theory, as discussed in the previous article.

But not every statutory violation automatically creates a private negligence claim.

The purpose of the statute, the applicable doctrine, and the jurisdiction all matter.

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Public Entities and Governmental Duties

Duty becomes particularly complicated when the defendant is a government entity or public official.

Governmental bodies may enjoy forms of sovereign immunity or statutory protections.

Some jurisdictions recognize special rules concerning:

• police protection;
• emergency services;
• governmental functions;
• public roads;
• public buildings;
• and discretionary decisions.

A person therefore cannot assume that ordinary negligence principles apply to a governmental defendant in exactly the same way they apply to a private individual.

The applicable statute and jurisdiction must be examined carefully.

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Duties to Third Parties

A particularly interesting problem occurs when the defendant’s conduct affects someone who is not directly involved in the defendant’s relationship with another person.

Suppose A provides a service to B.

C, a third party, is later harmed.

Does A owe C a duty?

The answer depends on the nature of the service, the foreseeability of harm, the relationship among the parties, and applicable law.

This issue arises frequently in cases involving:

• professional services;
• financial information;
• products;
• negligent misrepresentation;
• property transactions;
• and other activities affecting third parties.

The law generally does not impose unlimited liability to every person who might indirectly be affected by someone’s conduct.

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Duty to Control Another Person

Another difficult category involves claims that the defendant should have prevented someone else from causing harm.

For example:

A employer may be accused of failing to control or supervise an employee.

A parent may be accused of failing to supervise a child.

A school may be accused of failing to protect a student.

A property owner may be accused of failing to control a dangerous person on the premises.

The question becomes:

Did the defendant have a legally recognized duty to control or protect against the conduct of another person?

Such duties depend heavily on the relationship between the parties and the circumstances.

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Duty to Warn

In some circumstances, a duty may involve warning another person about a foreseeable danger.

For example, a property owner who knows of a dangerous condition may have obligations to warn people who are reasonably expected to encounter it, depending on applicable law.

Manufacturers, professionals, employers, and others may also have duties to provide warnings in particular circumstances.

A warning, however, is not always sufficient.

If a danger can reasonably be eliminated, the law may require more than simply providing a warning.

The question is always what reasonable care required under the circumstances.

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Duty and Knowledge

Knowledge can be important to determining whether a duty has been breached, particularly in cases involving dangerous conditions.

Consider a spill in a store.

If an employee created the spill moments ago and had no reasonable opportunity to discover it, the breach analysis may differ from a situation in which the store knew about the spill for an hour and did nothing.

This illustrates an important distinction:

Duty concerns the legal obligation.

Knowledge and notice can help determine whether the defendant failed to meet that obligation.

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Duty and Causation Are Different

Another common mistake is to confuse duty with causation.

Suppose A owes B a duty of reasonable care.

That establishes the first element.

But B must still establish that A’s breach caused the injury.

The existence of a duty does not prove that the defendant caused the plaintiff’s harm.

The sequence is:

Duty

↓

Breach

↓

Causation

↓

Damages

Each stage requires separate analysis.

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The Special Problem of Omissions

Some of the most difficult duty cases involve omissions—things the defendant failed to do.

The law is generally more cautious about imposing liability for failing to act than for affirmative conduct that creates danger.

Suppose A pushes B into a lake.

A’s affirmative conduct creates the danger.

Suppose instead that A sees B fall into the lake and simply walks away.

The legal analysis may be different because A did not create the danger.

This distinction between affirmative conduct and failure to act is fundamental to common-law duty doctrine.

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When the Defendant Creates the Risk

If a defendant’s own conduct creates a risk, the defendant may have an obligation to take reasonable steps to prevent resulting harm.

Imagine:

A accidentally knocks over a candle.

The candle starts a fire.

A realizes what happened but leaves without warning anyone.

The defendant’s initial conduct created the danger.

That can significantly affect the duty analysis concerning subsequent conduct.

The law is generally more willing to recognize obligations arising from risks that the defendant has created or increased.

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Duty in Medical Malpractice

Medical malpractice provides a clear illustration of duty.

A physician-patient relationship can establish professional obligations.

Suppose a doctor undertakes to treat a patient.

The doctor may owe duties concerning the provision of medical care consistent with the applicable professional standard.

If the doctor breaches that duty and the breach causes legally recognized injury, negligence liability may arise.

Medical malpractice therefore demonstrates how:

relationship → duty → standard of care → breach → causation → damages

can operate within a specialized field.

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Duty in Product Liability

Products can create another complicated duty structure.

Manufacturers and sellers may have legal obligations concerning product safety.

A defective product can injure someone who never personally entered into a contract with the manufacturer.

This illustrates one of the important differences between contract and tort law.

A consumer’s rights may exist even where there is no direct contractual relationship with the manufacturer.

The applicable theory may involve negligence, strict products liability, warranty law, statutory claims, or several theories simultaneously.

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Duty in Automobile Accidents

Automobile negligence provides perhaps the simplest illustration.

When people operate vehicles, they generally owe duties of reasonable care to others who may foreseeably be affected by their conduct.

Drivers must take reasonable precautions in light of:

• traffic;
• weather;
• road conditions;
• visibility;
• pedestrians;
• other vehicles;
• and known hazards.

The duty exists independently of a contract between the drivers.

That is why a negligence claim can arise between complete strangers.

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The Plaintiff Must Be Within the Relevant Scope of Duty

A difficult duty question sometimes concerns who is protected by the duty.

Suppose a defendant’s conduct creates a risk.

Does the defendant owe a duty to:

• everyone in the world?
• everyone nearby?
• only foreseeable victims?
• people in a particular relationship with the defendant?

The answer is not necessarily the same in every jurisdiction.

Tort law must draw boundaries around legal responsibility.

Otherwise, every act could potentially produce unlimited liability for every indirect consequence.

Duty doctrine therefore helps define the scope of legally recognized responsibility.

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Duty as a Limiting Principle

This is one of the deeper purposes of duty doctrine.

Imagine that A carelessly drops a glass.

The glass breaks.

Suppose the noise causes C, several blocks away, to become distracted and make a business mistake.

Should A be legally responsible for C’s economic loss?

Without limiting principles, the chain of possible consequences could become practically infinite.

Duty doctrine helps prevent this.

It asks whether the law recognizes an obligation toward this plaintiff in these circumstances.

Thus, duty is not merely a technical requirement.

It is one of the mechanisms through which tort law defines the boundaries of responsibility.

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Duty and Public Policy

Courts sometimes consider public-policy concerns when determining whether a duty should exist.

Potential considerations can include:

• the social consequences of recognizing the duty;
• the burden placed on defendants;
• the likelihood of excessive litigation;
• the ability to prevent harm;
• the nature of the relationship;
• the predictability of liability;
• the availability of insurance;
• and the coherence of existing legal rules.

This is one reason duty can be more difficult than simply applying a mathematical formula.

The question is partly doctrinal and partly institutional:

Should the law impose this responsibility on this defendant toward this plaintiff?

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The Role of the Court

Duty is often determined by a judge rather than a jury.

The precise allocation between judge and jury varies by jurisdiction and by issue.

Generally, courts determine questions of law, while juries may determine disputed factual questions such as whether conduct was reasonable under the circumstances.

This creates an important division:

Judge: What legal duty applies?

Jury: Did the defendant’s conduct satisfy the applicable standard under the facts?

Again, the exact allocation depends on jurisdiction and the particular case.

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Duty Is Not Universal

One of the most important lessons is that people do not automatically owe the same duties to everyone.

A person may owe:

• one duty to a passenger;
• another to a customer;
• another to an employee;
• another to a stranger;
• and potentially no affirmative duty to another person in certain circumstances.

Duty is therefore relationship-sensitive and circumstance-sensitive.

The same conduct can produce different legal consequences depending upon who was affected and what relationship existed.

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A Duty of Care Hypothetical

Consider this example.

A owns a supermarket.

A customer enters the store.

A supermarket employee discovers a large puddle in an aisle.

The employee tells the manager.

The manager does nothing.

Ten minutes later, the customer slips on the puddle and suffers a serious injury.

The analysis might begin:

1. Duty

The store may owe customers a duty of reasonable care concerning dangerous conditions.

2. Knowledge

The store had actual notice of the puddle.

3. Breach

Failing to clean the puddle or provide an adequate warning may constitute a breach.

4. Causation

The puddle caused the customer’s fall.

5. Damages

The customer suffered legally recognized injury and losses.

The important point for this article is the first step:

Why did the store owe this customer a duty?

Because the relationship between a business and its customers can create legally recognized obligations of reasonable care.

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Another Hypothetical: No General Duty to Rescue

Now change the facts.

A is walking through a park.

A sees B, a stranger, fall into a pond.

A did not cause B to fall.

A could potentially call for help.

But A walks away.

Whether A is legally liable for failing to rescue B depends on applicable law and any special circumstances.

The crucial point is that moral responsibility and legal duty are not automatically identical.

If A had pushed B into the pond, however, the analysis would be dramatically different because A’s own conduct created the danger.

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Duty of Care and the Reasonable Person

The relationship between duty and the reasonable-person standard can be summarized as follows:

Duty

The law requires reasonable care.

Standard of care

What would reasonable care require under these circumstances?

Breach

Did the defendant fail to meet that standard?

Thus:

Duty establishes the obligation; the standard of care gives that obligation practical content.

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The Difference Between Duty and Liability

The existence of a duty does not mean that the defendant is liable.

It means only that the legal system recognizes an obligation relevant to the plaintiff’s claim.

The plaintiff must still establish:

• breach;
• causation;
• damages;
• and any other required elements.

The defendant may also raise defenses.

Therefore:

Duty ≠ Liability

Instead:

Duty is the first gateway to negligence liability.

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A Practical Duty Analysis

When analyzing a potential negligence claim, ask the following questions.

Question 1: Who is the plaintiff?

What kind of person was harmed?

Question 2: Who is the defendant?

What role or relationship does the defendant have?

Question 3: What happened?

Was the defendant’s conduct affirmative or an omission?

Question 4: Did the defendant create the risk?

If so, that may be highly significant.

Question 5: Was there a special relationship?

Did the defendant have a relationship with the plaintiff or with the person who created the danger?

Question 6: Was the harm foreseeable?

Would the relevant type of harm have been reasonably foreseeable?

Question 7: Does a statute or regulation apply?

A statutory rule may create or influence the duty.

Question 8: Does public policy affect the analysis?

Would recognizing the proposed duty create unreasonable or unintended consequences?

Question 9: What jurisdiction governs?

Duty rules can differ substantially among states.

This last question is essential.

There is no single universal American negligence rule covering every duty situation.

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Duty of Care vs. Criminal Law

Duty also appears in criminal law, but the concepts should not be conflated.

A criminal offense may require proof that the defendant had a particular legal obligation and violated it.

But civil negligence and criminal negligence are distinct legal doctrines.

In civil tort law, the question may be:

Did the defendant owe the plaintiff a duty of reasonable care and breach it?

In criminal law, the question is whether the defendant’s conduct satisfies the elements and required mental state of a specific criminal offense.

The existence of a civil duty does not automatically establish criminal responsibility.

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Duty of Care vs. Contract

Contract law can create duties between parties because they voluntarily agreed to particular obligations.

Tort law can impose duties independently of contract.

For example, a doctor and patient may have a contractual relationship, but professional duties may also arise under tort law.

Similarly, a manufacturer may have contractual relationships with distributors while owing tort duties to consumers who never contracted directly with the manufacturer.

This illustrates why identifying the source of the duty is so important.

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The Philosophical Dimension of Duty

Duty of care raises a profound question about the nature of law:

When should one person’s freedom of action be limited by another person’s right to protection from harm?

If the law imposed no duties of care, individuals could expose others to unreasonable risks without civil consequences.

But if the law imposed unlimited duties, ordinary human activity could become impossible because every person would potentially be responsible for every consequence of every action.

Tort law therefore attempts to establish a boundary.

It recognizes that people must be free to act, but that freedom carries responsibilities when conduct creates reasonably foreseeable risks to others.

Duty of care is one of the principal legal mechanisms for drawing that boundary.

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The Core Principle

The entire concept can be reduced to one sentence:

A duty of care exists when the law recognizes that the defendant had an obligation to exercise appropriate care toward the plaintiff under the circumstances.

But that sentence immediately raises further questions:

• Why does the duty exist?
• Who is protected by it?
• What does reasonable care require?
• What risks are foreseeable?
• Does the defendant’s relationship with the plaintiff matter?
• Did the defendant create the danger?
• Did the defendant voluntarily assume responsibility?
• Does a statute create or modify the duty?
• Should public policy limit the duty?

Those questions form the substance of duty doctrine.

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Key Takeaways

• Duty of care is the first major element of negligence.
• It asks whether the defendant owed a legally recognized obligation to the plaintiff.
• A duty generally requires the defendant to exercise an appropriate level of care under the circumstances.
• Duty and breach are different concepts.
• Duty asks what the law requires; breach asks whether the defendant failed to satisfy that requirement.
• Not every moral obligation is a legal duty.
• A person generally does not have an unlimited duty to rescue strangers.
• A duty to act can arise from special relationships, voluntary undertakings, creation of a risk, contracts, statutes, or other circumstances.
• A defendant who creates or increases a risk may have obligations to take reasonable steps to prevent further harm.
• Foreseeability can be important to duty analysis, although its precise role varies among jurisdictions.
• Professionals can owe specialized duties to clients or patients.
• Property owners and businesses may owe duties to people entering their premises.
• Government defendants may be subject to special statutory and immunity rules.
• Duty helps establish the boundaries of legal responsibility.
• The existence of a duty does not itself establish negligence liability.
• The plaintiff must generally still prove breach, causation, damages, and satisfy any other applicable requirements.
• Duty rules vary by jurisdiction, making the governing state’s law important in any real legal dispute.

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Frequently Asked Questions

What is a duty of care?

A duty of care is a legal obligation requiring a person to exercise an appropriate level of care toward another person under circumstances recognized by law.

Is everyone required to protect everyone else from harm?

No. Tort law does not generally impose an unlimited obligation to protect every person from every possible danger.

Do you have a legal duty to rescue a stranger?

Generally, there is no universal common-law duty to rescue a stranger who is in danger but whom you did not place in danger. Important exceptions can arise from special relationships, voluntary undertakings, statutes, and other circumstances.

What is the difference between duty and breach?

Duty asks whether the law imposed an obligation of care. Breach asks whether the defendant failed to meet the applicable standard of care.

Does foreseeability establish a duty?

Not necessarily. Foreseeability can be an important factor in duty analysis, but jurisdictions differ in how they use foreseeability and what additional factors courts consider.

Can a contract create a duty of care?

A contract can create contractual obligations. A contractual relationship can also be relevant to whether independent tort duties exist. Contractual duties and tort duties should be analyzed separately.

Can a person owe a duty to someone with whom they have no contract?

Yes. Many negligence claims arise between people who have no contractual relationship.

Can a person create a duty by voluntarily helping someone?

Potentially. A person who voluntarily undertakes to provide assistance may acquire legal obligations concerning how that assistance is performed, depending on the applicable law and circumstances.

Does creating a danger create a duty?

Creating or increasing a risk can be an important basis for recognizing an affirmative obligation to take reasonable steps to prevent further harm.

Who decides whether a duty exists?

Duty is generally a question of law for the court, although the precise division between judicial and jury questions varies by jurisdiction and case.

Does having a duty mean that the defendant is liable?

No. The plaintiff must generally establish breach, causation, damages, and any other required elements.

Does a duty of care exist in criminal law?

Criminal law can impose legal obligations, but civil negligence duties and criminal duties should not be treated as identical. Criminal liability depends on the elements and culpability requirements of the specific offense.

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Further Reading

For a foundational overview of negligence and its elements, see the Cornell Law School Legal Information Institute (LII).

Cornell Law School — Legal Information Institute: Negligence

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Conclusion

Duty of care is the gateway through which a negligence claim enters the legal system.

Before asking whether a defendant acted carelessly, the law must first establish that the defendant had a legal obligation to exercise care toward the plaintiff.

That requirement prevents negligence law from becoming an unlimited system of liability.

The law does not punish every mistake.

It does not impose responsibility for every unfortunate consequence.

And it does not automatically require every person to rescue every other person from every danger.

Instead, Tort Law identifies circumstances in which one person must take reasonable care toward another.

Sometimes that duty arises from the relationship between the parties.

Sometimes it arises because the defendant created a risk.

Sometimes it arises because the defendant voluntarily assumed responsibility.

Sometimes legislation establishes or influences the obligation.

And sometimes courts must determine whether public policy and the circumstances justify recognizing a duty at all.

The central principle is therefore:

Before there can be negligent breach, there must ordinarily be a legally recognized duty.

Once that duty has been established, the next question becomes much more concrete:

What level of care did the law require?

That takes us to the next essential concept in negligence:

The Reasonable Person Standard and the Standard of Care.