
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means to stand by things decided. In other words, common law is largely based on precedent—judicial rulings made in previous similar cases. In a common law jurisdiction, several stages of research and analysis are required to determine what the law is in a given situation. This includes ascertaining the facts, locating relevant statutes and cases, and extracting principles, analogies, and statements by various courts. Common law is in contrast to civil law, which relies primarily on codes and statutes. Common law is practiced in several countries, including the United States, the United Kingdom, Australia, Canada, and India.
| Characteristics | Values |
|---|---|
| Basis | Judicial decisions, not statutes |
| Type of law | Unwritten, based on precedent |
| Sources | Precedent, institutionalized opinions, interpretations, and public juries |
| Jurisdiction | Binding only in a particular jurisdiction |
| Court hierarchy | Higher courts' decisions carry more weight and are binding for lower courts |
| Court records | Maintained over time through court records, yearbooks, and law reports |
| Adaptability | Allows freedom for interpretation and adaptation to new situations |
| Consistency | Promotes stability and consistency across jurisdictions |
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What You'll Learn

Common law vs civil law
Common law, also known as case law, is a body of unwritten laws based on past judicial decisions or precedents. It is deeply rooted in the principle of stare decisis, which means "to stand by things decided". Common law originated in England during the Middle Ages and was spread to other parts of the world through British colonisation. Today, it is practised in countries like the United States, Canada, Australia, India, and the United Kingdom.
In a common law system, judicial cases are considered the most important source of law, giving judges an active role in rule-making and interpretation. This allows for adaptability, as the law can be applied to situations that were not contemplated by the legislature at the time. Common law systems are less prescriptive, with fewer provisions implied into contracts. This means that the terms governing the relationship between parties in a contract must be explicitly outlined.
Civil law, on the other hand, is a comprehensive, codified set of legal statutes created by legislators. It is characterised by a more prescriptive nature, with more provisions implied into contracts. This system is based on civil codes that cover all eventualities, and judges have a more limited role, primarily applying the law to specific cases. Civil law developed in continental Europe and was spread through the colonies of European powers such as Spain and Portugal. Today, approximately 150 countries have a civil law system, compared to about 80 countries with a common law system.
The United States operates under both common and civil law, with the courts following common law. Common law is particularly useful in situations where there is no clear legislative guidance, allowing judges to establish new precedents. This promotes stability and consistency in the legal system, as lower courts generally follow the example set by higher courts. However, lower courts have the ability to deviate from these precedents if the circumstances warrant it.
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Common law jurisdictions
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It is deeply rooted in stare decisis, a Latin term that means "to stand by things decided". This means that judges in common law jurisdictions rely on previous rulings, or case law, to make decisions in new cases.
In a common law jurisdiction, several stages of research and analysis are required to determine "what the law is" in a given situation. This involves ascertaining the facts, locating relevant statutes and cases, extracting principles and analogies, and finally integrating all the information to determine the applicable law. The decisions of higher courts carry more weight and are typically binding on lower courts.
Common law originated in England in the early Middle Ages in the King's Court (Curia Regis). It was further consolidated during the reign of Henry II, when royal officials travelled the country inquiring about the administration of justice. Over time, it spread to other parts of the world, including North America during the colonial period, and it continues to influence legal systems in countries like the United States, Canada, Australia, and India.
Today, common law coexists with civil law, which is a comprehensive, codified set of legal statutes. While common law relies on case law and legal precedent, civil law provides clear rules and codes for judges to follow. The benefit of common law is that it allows for adaptability and flexibility in situations not contemplated by the legislature. However, civil law offers consistency and clarity in defining the procedures and outcomes for specific disputes.
Common law has practical applications in various areas of law, such as contract law and the law of torts. It also encompasses the concept of common-law marriage, which grants similar rights to unmarried couples who meet certain conditions. The maintenance of precedents in common law jurisdictions ensures stability and consistency in legal systems.
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Common law in the US
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. Common law is deeply rooted in stare decisis, a Latin term that roughly means "to stand by things decided". In other words, courts follow precedents established by previous decisions. When a similar case has been resolved, courts typically align their reasoning with the precedent set in that decision.
In the US, common law influences the decision-making process in unusual cases where the outcome cannot be determined based on existing statutes or written rules of law. The US common-law system evolved from a British tradition that spread to North America during the 17th and 18th centuries. Today, the US operates under a dual system of both common and civil law. While common law systems rely on case law and legal precedent to guide their decisions, civil law systems rely primarily on codes and statutes.
The US federal courts are divided into twelve regional circuits, each with a circuit court of appeals. Decisions of one circuit court are binding on the district courts within the circuit and on the circuit court itself, but they are only persuasive authority on sister circuits. District court decisions are not binding precedent at all, only persuasive.
Common law still has practical applications in some areas of law, such as contract law and the law of torts. Common law promotes stability and consistency in the US legal justice system because everyone involved knows that the ultimate outcome will be based on previous case law and not on subjective, personal viewpoints.
In common law systems, precedents are maintained over time through court records and are historically documented in collections of case law referred to as yearbooks and law reports.
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Common-law marriage
The requirements for common-law marriage vary, but they generally include cohabitation, the legal right or "capacity" to marry, and the intention to be married. The length of time a couple lives together is considered on a case-by-case basis, and while there is no statutory requirement, longer cohabitation strengthens the case for common-law marriage. Additionally, both partners must be at least 18 years old, of sound mind, and cannot already be married to other people.
The concept of common-law marriage is an example of common law in action today. Common law, also known as case law or judicial precedent, is a body of unwritten laws based on legal precedents established by the courts. It influences the decision-making process in unusual cases where the outcome cannot be determined based on existing statutes or written rules of law. Common law draws from institutionalised opinions and interpretations from judicial authorities and public juries, and it promotes stability and consistency in legal systems.
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Common law in court records
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means "to stand by things decided". In other words, common law is largely based on precedent—judicial rulings made in previous similar cases. The judge presiding over a case determines which precedents apply to that particular case.
In common law systems, precedents are maintained over time through court records and are historically documented in collections of case law referred to as yearbooks and law reports. After the American Revolution in 1776, Massachusetts became the first state to establish an official Reporter of Decisions. Newer states often looked to the Massachusetts Reports for authoritative precedents as a basis for their own common law.
In a common law jurisdiction, several stages of research and analysis are required to determine "what the law is" in a given situation. One must first ascertain the facts, locate any relevant statutes and cases, and then extract the principles, analogies, and statements by various courts. More recent decisions and decisions of higher courts carry more weight than earlier cases and those of lower courts. Finally, one integrates all the lines drawn and reasons given and applies that law to the facts.
Common law still has practical applications in some areas of law, such as contract law and the law of torts. It is important to note that common law is not the only legal system used today. Many countries use another system known as civil law, which relies primarily on codes and statutes.
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Frequently asked questions
Common law is a body of unwritten laws based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means "to stand by things decided". Common law is also known as case law or judge-made law.
In common law systems, the first step is to look at earlier court rulings and decisions to determine which precedents apply to a particular case. Common law promotes stability and consistency in the legal system.
Common law systems rely on case law and legal precedent to guide their decisions, whereas civil law systems primarily rely on codes and statutes. Civil law has a comprehensive set of legal statutes created by legislators that outline the procedures for handling claims and punishments for offences.









































