
The common law system, which originated in England during the Middle Ages, is a body of unwritten laws based on legal precedents and court decisions. Common law is practised in several countries around the world, including the US, Canada, India, and Australia, and is often contrasted with civil law systems. Common law is characterised by its reliance on caselaw and stare decisis, a Latin phrase that means to stand by things decided, which refers to the principle that courts and judges should follow previous rulings and precedents when dealing with similar cases. In this way, common law is a system that evolves and changes based on precedent, with recent decisions and those of higher courts carrying more weight.
| Characteristics | Values |
|---|---|
| Definition | A body of unwritten laws based on legal precedents established by the courts |
| Other names | Case law |
| Origin | England during the Middle Ages |
| Evolution | Evolved from a British tradition that spread to North America during the 17th and 18th centuries |
| Current practitioners | Australia, Canada, India, Hong Kong, New Zealand, the United Kingdom, and the United States |
| Basis of decisions | Previous caselaw, not on subjective, personal viewpoints |
| Nature of decisions | Binding, especially those of higher courts or legislatures |
| Nature of laws | Grows and changes based on precedent |
| Nature of contracts | Few provisions are implied into a contract by law, so all terms must be set out in the contract itself |
| Comparison to civil law | Less prescriptive, more flexible, and adaptable to the unforeseen |
| Comparison to civil law | Less standardized, which can lead to longer court proceedings |
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What You'll Learn

Common law is a body of unwritten laws
Common law is a body of law unwritten laws based on legal precedents established by the courts. It is a system of law that originated in medieval England and spread to many former British colonies during the colonial period, including the United States, Canada, Australia, India, and New Zealand. Common law is also known as case law, and it relies on stare decisis, a Latin phrase that means "to stand by things decided". In other words, common law systems require courts and judges to follow previous decisions and rulings, or caselaw, when dealing with similar cases. This is in contrast to civil law systems, which rely primarily on codes and statutes created by legislators.
The reliance on stare decisis and caselaw gives common law its unwritten nature. While there are no official legal codes or statutes in common law, there is a body of institutionalized opinions, interpretations, and precedents from judicial authorities and public juries that guide decision-making. This body of unwritten law is dynamic and constantly evolving as new precedents are set by judges and added to the body of common law.
The unwritten nature of common law has advantages and disadvantages. On the one hand, it allows for flexibility and adaptability in the legal system. Common law can be applied to situations that were not contemplated at the time by the legislature, and it can evolve to reflect changes in societal norms and values. For example, common law precedents that marginalized women in the 19th and early 20th centuries were eventually overturned due to changing societal attitudes towards women's rights.
On the other hand, the unwritten nature of common law can also lead to inconsistencies and unpredictability in legal outcomes. In jurisdictions with weak respect for precedent, similar questions of law may be re-litigated each time they arise, making it difficult for parties to predict legal outcomes and rely on past decisions as reliable guides. This can result in protracted legal procedures and higher legal fees.
The unwritten nature of common law also means that it is constantly being interpreted and reinterpreted by judges and legal scholars. This interpretive aspect of common law has led to the development of comprehensive compilations of common law, such as the Institutes of the Lawes of England by Lord Chief Justice Edward Coke in the 17th century. Today, common law resources like the ALI Restatements in the United States and the Corpus Juris Secundum provide authoritative summaries of common law and its variations across different jurisdictions.
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It is based on legal precedents and caselaw
Common law, also known as case law, is a body of unwritten laws based on legal precedents and caselaw established by the courts. It draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law originated in medieval England and spread to the British colonies during the 17th and 18th centuries. Today, it is practiced in various countries, including the United States, Canada, India, Australia, and the United Kingdom.
At the core of common law is the principle of stare decisis, which means "to stand by things decided." This principle emphasizes the importance of following previous court decisions and rulings when dealing with similar cases. Judges in common law jurisdictions rely on stare decisis to determine the applicable law in a given situation. They ascertain the facts, locate relevant statutes and cases, and consider the principles and analogies applied by other courts to predict how the next court might rule.
The reliance on stare decisis promotes stability and consistency in the legal system. It ensures that decisions are based on previous caselaw rather than subjective viewpoints. Additionally, it allows for adaptability and flexibility, as common law can address unforeseen situations not contemplated by the legislature. Judges are empowered to interpret and revise the law to adapt to new trends, ensuring that the law remains relevant and responsive to societal changes.
However, the reliance on precedent in common law has faced criticism. Past decisions can shape future rulings, potentially perpetuating outdated or biased interpretations. While judges have the power to deviate from precedents or overturn them, this occurs rarely. As a result, societal changes may be necessary to prompt the overturning of a precedent, which can be a lengthy process.
Common law differs from civil law, which relies primarily on codes and statutes created by legislators. Civil law provides a comprehensive set of legal statutes that outline procedures and punishments for specific disputes. In contrast, common law focuses on applying consistent standards of interpretation across cases, aiming for consistent outcomes. While civil law offers clear rules for judges to follow, common law allows for some freedom of interpretation within the framework of precedent.
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Common law is flexible and grows and changes over time
Common law is a body of unwritten laws based on legal precedents established by the courts. It is flexible and adapts to changes in society over time. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It is a system that promotes stability and consistency in the legal justice system.
Common law is flexible because it can respond to changes in society. It is not as rigid as civil law systems, which require lawmakers to pass changes in statutes and codes, a process that can be lengthy and sometimes unsuccessful. In contrast, common law allows higher courts to overrule prior decisions as "bad law" without needing lawmakers to intervene. This flexibility is important as it allows the law to adapt to new trends in political, legal, and social philosophy.
The flexibility of common law is also reflected in its ability to leave the legal code open for interpretation. This is particularly valuable when dealing with unusual cases where the outcome cannot be determined based on existing statutes or written rules of law. Judges in common law systems have the freedom to interpret and apply precedents to the specific circumstances of a case. This allows the law to evolve through a series of gradual steps, reducing disruptive effects.
Common law relies on detailed records of similar situations and statutes, known as stare decisis, or "to stand by things decided". The judge presiding over a case determines which precedents apply to that particular case. While lower courts generally follow the decisions of higher courts, they can modify or deviate from precedents if they are outdated or if the current case is substantially different. Over time, societal changes can prompt a judicial body to overturn outdated or biased precedents, leading to the evolution of common law.
The flexibility of common law allows it to grow and change over time, adapting to new societal trends and ensuring that outdated or unfair precedents can be overturned. This adaptability is a key feature of common law systems and contributes to their stability and consistency.
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It originated in England during the Middle Ages
The common law system, as we know it, originated in England during the Middle Ages. It was established in the King's Court (Curia Regis), a single royal court set up for most of the country at Westminster, near London. The common law was so named because it was common to all the king's courts across England. It established a unified legal system, gradually replacing local folk courts and manorial courts.
The common law system in England directly influenced the system in Wales (since 1536) and Ireland, and partially influenced the distinct legal system in Scotland. The English legal system was also spread across the British Empire's overseas colonies, many of which retain the common law system today.
The common law of England was largely created in the period after the Norman Conquest of 1066. The Normans had developed a customary law in Normandy, where literate clergymen acted as administrators. Some of these clergymen were familiar with Roman law and the canon law of the Christian church. Canon law was applied in the English church courts, and Roman law was taught and studied in 12th-century England. The first treatises on English law, such as Glanvil's treatise, were influenced by Roman law. The 13th-century treatise by Bracton, De Legibus et Consuetudinibus Angliae (On the Laws and Customs of England), was also heavily influenced by Roman law and the division of law in Justinian's Institutes.
In contrast to civil law systems, which centre around a comprehensive code of statutes, common law systems rely on caselaw and legal precedent to guide their decisions. Common law draws from institutionalised opinions and interpretations from judicial authorities and public juries. A precedent, known as stare decisis, is a history of judicial decisions that form the basis of evaluation for future cases.
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Common law systems are used in the US, Canada, India, and Australia
The common law system is used in several countries around the world, including the US, Canada, India, and Australia. Each country's legal system has unique features, but they all share the common law tradition.
In the US, the common law system is characterised by its reliance on court precedent in formal adjudications. Even when a statute is at issue, previous judicial determinations are critical to the court's resolution of a matter. The federal court system is structured into three tiers, with the United States District Courts as the trial-level courts, the United States Court of Appeals as the first level of appeal, and the United States Supreme Court as the final arbiter of the law. The American legal system is also based on federalism, with national and state governments sharing powers, creating a complex interplay between various sources of law.
Canada's federal system, on the other hand, avoids regional variability of federal law by granting national jurisdiction to both layers of appellate courts. This ensures consistency in the application of common law across the country.
India's legal system has been influenced by its colonial history. With the British Raj, Hindu and Islamic laws were abolished in favour of British common law. The East India Company, which governed India for a significant period, sought to implement a more amicable ruling system that incorporated English Common Law with local laws. The All-India Legislative Council, established in the 19th century, played a pivotal role in codifying Indian laws, making them more aligned with British common law. As a result, India's present judicial system retains influences from the British era.
Australia's common law system is evident in various aspects, including environmental law. The recognition of native title by the High Court and its application by other courts demonstrate the influence of common law principles in Queensland's environmental legal system. For instance, the concept of "standing," which refers to the legal right to commence court action, has been a factor in shaping public interest litigation to protect the environment.
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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 also known as case law.
Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It relies on caselaw and legal precedent to guide decisions.
Common law promotes stability and consistency as outcomes are based on previous caselaw rather than subjective viewpoints. It also offers efficiency, adaptability, and flexibility as it can respond to changes in society.


















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