
The common law system, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It originated in England during the Middle Ages, 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 system is deeply rooted in stare decisis, which means to stand by things decided, where courts follow precedents established by previous decisions. Today, approximately one-third of the world's population lives in common law jurisdictions or in mixed legal systems that integrate common law and civil law. Many former colonies, such as the United States, Canada, India, and Australia, continue to rely heavily on common law when resolving legal disputes.
| Characteristics | Values |
|---|---|
| Definition | Common law is a body of unwritten laws based on legal precedents established by the courts. |
| Origin | Common law originated in England during the Middle Ages. |
| Basis | Common law is based on stare decisis, which means "to stand by things decided". |
| Evolution | Common law evolves gradually over time through a series of incremental changes, allowing for adaptability and flexibility. |
| Judicial Precedent | Common law systems give significant weight to judicial precedent, with decisions of higher courts carrying more weight. |
| Court Decisions | Court decisions in common law are binding and become precedents for future similar cases. |
| Flexibility | Common law is more flexible than statutory law as it allows for reinterpretation and revision of precedents without legislative intervention. |
| Research and Analysis | Common law requires multiple stages of research and analysis to determine the applicable law in a given situation. |
| Influence | Common law has influenced the legal systems of many former British colonies, including the United States, Canada, India, and Australia. |
| Comparison with Civil Law | Common law values precedent and flexibility, while civil law emphasizes codes, statutes, and standardization. |
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What You'll Learn

Common law's origins
The common law system, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It originated in England during the Middle Ages in the King's Court (Curia Regis), a single royal court set up for most of the country at Westminster, near London. It did not originally consist of substantive rights but rather procedural remedies. The working out of these remedies has, over time, produced the modern system in which rights are seen as primary over procedure.
The common law, so named because it was common to all the king's courts across England, is deeply rooted in stare decisis ("to stand by things decided"), where 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. However, in a "case of first impression" with no precedent or clear legislative guidance, judges are empowered to resolve the issue and establish a new precedent.
The English common law was largely created in the period after the Norman Conquest of 1066. The Anglo-Saxons, especially after the accession of Alfred the Great in 871, had developed a body of rules resembling those used by the Germanic peoples of northern Europe. Local customs governed most matters, while the church played a large part in government. The common law established a unified legal system, gradually supplanting the local folk courts and manorial courts.
England spread the English legal system across the British Isles, first to Wales, then to Ireland and overseas colonies, later continued by the British Empire. Many former colonies retain the common law system today, including the United States, Canada, India, Australia, and New Zealand.
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Common law today
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". This means that courts follow precedents established by previous decisions. However, in cases with no precedent or clear legislative guidance, judges can establish new precedent. Common law is also known as case law or judge-made law.
Today, common law is one of the two main legal systems used throughout the world, the other being civil law. Common law systems include the US, Canada, India, Australia, Hong Kong, New Zealand, and the UK. Many former colonies also retain the common law system. In total, approximately one-third of the world's population lives in common law jurisdictions or in mixed legal systems that integrate common law and civil law.
In common law jurisdictions, 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. The decisions of a court are binding only in a particular jurisdiction, and even within a jurisdiction, some courts have more power than others.
Common law is more malleable than statutory law. Common law courts are not absolutely bound by precedent and can reinterpret and revise the law to adapt to new trends in political, legal, and social philosophy. The common law evolves gradually over time, reducing disruptive effects.
While common law has benefits such as stability and consistency, it has also been criticised for leading to the unfair marginalization or disempowerment of certain groups. Past decisions, whether outdated or biased, continue to shape future rulings until societal changes prompt a judicial body to overturn the precedent.
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Common law vs civil law
Common law and civil law are the two main types of legal systems in the world. Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It originated in medieval England and is practised today in several countries including the US, the UK, Australia, Canada, Hong Kong, India, and New Zealand. Common law is deeply rooted in stare decisis, which means "to stand by things decided". Courts follow precedents established by previous decisions, and when no precedent exists, judges can reinterpret and revise the law to establish new precedent. Common law is generally less prescriptive than civil law, with few provisions implied into a contract, and it is important to set out all the terms of the contract explicitly.
Civil law, on the other hand, is a comprehensive, codified set of legal statutes created by legislators. It is rooted in the Roman Empire and was comprehensively codified and disseminated in the 19th century with codes such as France's Napoleonic Code and Germany's Bürgerliches Gesetzbuch. Civil law is generally more prescriptive than common law, with several provisions implied into a contract, and it is not necessary to set out all the terms of the contract explicitly. Civil law is the world's most common legal system, practised in about 150 countries.
One key difference between the two systems is their approach to precedent and written decisions. Common law systems place great weight on precedent, while civil law judges tend to give less weight to judicial precedent. Common law relies heavily on judicial precedent and case law, recognising prior court decisions as legally binding. In contrast, civil law relies on legal codes that function as the primary source of law. Civil law judges use the conditions in the applicable civil code to evaluate the facts of each case and make legislative decisions.
Another difference is the level of prescription and the number of implied provisions in contracts. Common law is less prescriptive, with few provisions implied into a contract, while civil law is more prescriptive, with several provisions implied. In a common law system, it is important to set out all the terms governing the relationship between the parties in the contract itself, while in a civil law system, inadequacies or ambiguities in the contract can be remedied by operation of law. As a result, contracts in a civil law system may be shorter.
In terms of infrastructure projects, a government may need to enact specific legislation in a common law system to protect its citizens. For example, it may prohibit a service provider from cutting off water or electricity supply to bad payers. In a civil law system, certain forms of infrastructure projects are referred to by well-defined legal concepts, and there may be specific legislation required to limit the scope of restrictions.
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Common law's benefits and drawbacks
Common law is a legal system that has shaped the legal landscape in many countries around the world. It is characterised by its reliance on judicial decisions and the principle of precedent, where past rulings serve as a guide for future cases. Common law is deeply rooted in stare decisis, which means "to stand by things decided".
Benefits of Common Law
Common law has several advantages, including:
- Stability and Consistency: This system promotes stability and consistency as outcomes are based on previous case law rather than subjective viewpoints.
- Efficiency: Judges in common law systems only need to follow precedent, which can make court proceedings shorter and save time and money.
- Adaptability: Common law can address unforeseen situations as it is not limited to specific statutes or rules.
- Flexibility: This system can respond to societal changes as it evolves through court rulings and interpretations, allowing for the refinement and expansion of legal doctrines.
- Legal Development: Common law promotes the continuous interpretation and application of legal principles, which can lead to the development of new legislation.
- Practical Solutions: This system is grounded in real-world scenarios, resulting in legal principles that are closely aligned with everyday realities.
- Case-by-case Analysis: Common law allows for an in-depth analysis of the specific facts and circumstances of each case, promoting justice on an individual basis.
Drawbacks of Common Law
There are also some disadvantages to the common law system, such as:
- Lack of Certainty: The reliance on precedents and case-by-case analysis can lead to uncertainty and inconsistent results as different judges may interpret and apply the law differently.
- Time and Effort: In the past, finding relevant case law was a time-consuming process, requiring long hours of research.
- Social Bias: Common law can reflect the biases of society, making it difficult for marginalised groups to obtain favourable rulings until societal thought or legislation changes. For example, common law in England until the 1970s entitled fathers instead of mothers to custody of children during divorce, effectively trapping women in marriages.
- Complexity: Common law systems can be complex due to the interactions between different types of law, and the varying powers of different courts within a jurisdiction.
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Common law in former colonies
The common law system, which originated in England following the Norman Conquest in 1066, was spread to the British Isles, Wales, Ireland, and overseas colonies by the British Empire. Many former colonies, including the United States, Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom, continue to retain the common law system today, with some local variations.
Common law, also known as case law or judge-made law, is a flexible and adaptable legal system that is based on judicial precedent and the specific circumstances of each case. It is deeply rooted in stare decisis, which means "to stand by things decided," where courts follow precedents established by previous decisions. When a similar case arises, courts typically align their reasoning with the precedent set in that previous decision. However, judges have the power to reinterpret and revise the law without legislative intervention, allowing for the gradual evolution of the law over time.
In former colonies that adopted the common law system, the legal transplantation by the British colonial administration had a significant impact on the subsequent rule of law outcomes in these countries. The degree of representation of the indigenous population in legislative bodies and the integration of indigenous and British common law courts and values influenced the development of localized common law jurisprudence.
Today, approximately one-third of the world's population lives in common law jurisdictions or in mixed legal systems that integrate common law and civil law. Common law systems are characterized by their reliance on judicial precedent, the style of reasoning inherited from the English legal system, and the importance of institutionalized opinions and interpretations from judicial authorities and public juries.
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Frequently asked questions
Common law is a body of unwritten laws based on legal precedents established by the courts. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries.
Common law originated in England during the Middle Ages, specifically in the King's Court (Curia Regis) in the centuries following the Norman Conquest in 1066.
Common law is used in several countries that were formerly British colonies or protectorates, including the United States, Canada, India, Australia, Hong Kong, New Zealand, and the United Kingdom. Approximately one-third of the world's population lives in common law jurisdictions or mixed legal systems that integrate common law and civil law.
Common law is based on the principle of stare decisis, which means "to stand by things decided". In practice, this means that courts and judges follow precedents established by previous decisions when dealing with similar cases. Common law is more flexible than statutory law, as it can be reinterpreted and revised by courts to adapt to new trends without legislative intervention.








































