
Common law is a body of unwritten laws based on legal precedents established by the courts. It is a flexible system that can respond to changes in society and address situations not originally predicted by lawmakers. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It emphasizes precedent while allowing some freedom for interpretation. In the US, common law is found primarily at the state level, with a limited body of federal common law created and applied by federal courts. While there is no federal general common law, federal common lawmaking is necessary to protect uniquely federal interests. The US common-law system evolved from English common law during the colonial period, and today the US operates under a dual system of common and civil law.
| Characteristics | Values |
|---|---|
| Definition | Common law is a body of unwritten laws based on legal precedents established by the courts. |
| Basis | Common law is based on court decisions rather than codes or statutes. |
| Principle | Stare decisis, which means "to stand by things decided" in Latin. |
| Practice | Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. |
| System | Adversarial system, in which two sides present their cases to a neutral judge. |
| Application | Common law guides court rulings when the outcome is undetermined based on written rules of law. |
| Jurisdiction | Common law is practiced in Australia, Canada, the UK, US, Hong Kong, India, and New Zealand. |
| Flexibility | Common law is flexible since it can respond to changes in society. |
| Modification | Common law can be modified by higher courts, which can overrule prior decisions as "bad law". |
| Codification | Common law rules may be codified by legislatures to give them permanence or to modify/replace them with legislation. |
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What You'll Learn

Common law is a body of unwritten laws
The concept of common law originated in medieval England and was spread to North America during the 17th and 18th centuries. Today, the US operates under a dual system of both common and civil law. Common law is also practiced in Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom.
Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It is often regarded as a more flexible system than civil law as it allows for the adaptation of the law to situations that were not contemplated at the time by the legislature. However, common law has also been criticized for its potential to marginalize or disempower certain groups, as past decisions continue to shape future rulings until societal changes prompt a judicial body to overturn the precedent.
While common law relies primarily on precedents and judicial decisions, it does also consider some scattered statutes and legislative decisions. Common law is based on the belief that every right has a remedy, which has led to the inference of a private cause of action even when a statute provides administrative remedies.
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Common law is based on legal precedents
Common law is a body of unwritten laws based on legal precedents. It is a flexible system that can respond to changes in society and adapt to situations not contemplated by the legislature. Common law draws from institutionalised opinions and interpretations from judicial authorities and public juries. It is established by the courts and guides rulings when the outcome is undetermined based on written rules of law. Common law is based on the principle of stare decisis, which means "to stand by things decided" in Latin. This means that courts and judges need to follow earlier decisions and rulings when dealing with similar cases later. For example, if a court makes a particular decision based on a specific set of facts, then the court is required to follow that decision when ruling on the same or a closely related issue.
Common law is practised in several countries, including Australia, Canada, Hong Kong, India, New Zealand, the United Kingdom, and the United States. In the US, common law is found primarily at the state level, with a limited body of federal common law created and applied by federal courts in the absence of controlling federal statutes. The US common-law system evolved from a British tradition that spread to North America during the 17th and 18th centuries.
While common law relies on some scattered statutes and legislative decisions, it is primarily based on precedent, meaning the judicial decisions that have already been made in similar cases. These precedents are maintained through the records of the courts and are historically documented in collections of case law known as yearbooks and reports. The presiding judge determines the precedents to be applied in each new case.
Common law is similar to civil law in that both aim to establish consistent outcomes by applying the same standards of interpretation. However, civil law is a comprehensive, codified set of legal statutes created by legislators, while common law is unwritten and based on precedents established by the courts. Civil law clearly defines the cases that can be brought to court and the procedures for handling claims, while common law allows for some freedom of interpretation.
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Common law is flexible
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. It is largely based on precedent, meaning the judicial decisions that have already been made in similar cases. Common law is flexible because it can respond to changes in society. It allows some freedom for interpretation and can be adapted to situations that were not contemplated by the legislature.
Common law is a system of law that is based on precedents set by previous court decisions. It is a flexible system that allows judges to interpret the law and apply it to new situations. This flexibility can be seen in the way that common law courts use an adversarial system, in which two sides present their cases to a neutral judge. For example, in criminal cases, the prosecutor and the adjudicator are two separate people. The prosecutor presents the evidence to the adjudicator, who makes a decision based on the evidence presented. This is in contrast to civil law systems, which use an inquisitorial system in which an examining magistrate serves both roles by developing the evidence and arguments for both sides.
The flexibility of common law also allows for the evolution of the law over time. As society changes, the interpretation and application of the law can also change to reflect new social norms and values. This adaptability is one of the key strengths of the common law system. It allows the law to remain relevant and effective in a dynamic and ever-changing social landscape.
However, it's important to note that while common law provides flexibility in interpretation and application, it does not allow for the creation of new laws. The role of judges in a common law system is to interpret and apply existing laws, not to make new ones. That legislative power is typically reserved for elected officials or, in some cases, put to a vote in a referendum.
The flexibility of common law also extends to the revision process, which may result in several different revisions of an original draft. These revisions can be endorsed by the Uniform Law Commissioners, who then recommend that the states adopt these rules. However, in the case of model codes, such as the UCC, the rules do not have legal effect unless they are enacted by individual state legislatures as statutes. This process highlights the dynamic nature of common law and how it can be shaped by the states' specific needs and contexts.
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Common law is influenced by public juries
Common law is a body of unwritten laws based on legal precedents and past court rulings. It is largely based on the principle of stare decisis, which means "to stand by things decided" in Latin. This means that common law draws from past opinions and interpretations from judicial authorities and public juries.
Common law is practised in several countries, including Australia, Canada, India, the United Kingdom, and the United States. While the US federal system does not have a general common law, many states within the US have statutes that allow for common law.
The goal of common law is to establish consistent outcomes by applying the same standards of interpretation. However, elements of common law may differ between districts, as precedent depends on the case-by-case traditions of individual jurisdictions.
Public juries play an important role in common law. In common law jurisdictions, jury trials are often used in serious criminal cases. The right to a trial by jury is guaranteed in the United States Constitution and the Sixth Amendment. Jury trials are also a feature of common law systems in other countries, such as England and Wales, where they are used in criminal proceedings and some inquests.
In a jury trial, a jury of laypeople makes a decision or findings of fact, as opposed to a bench trial, where a judge or panel of judges decides. Juries are selected at random from the electoral register, and they are not paid for their service. The use of jury trials has influenced the nature of American civil and criminal procedure rules, contributing to a system where fact-finding is concentrated in a single trial.
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Common law courts use an adversarial system
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. It is largely based on precedent, meaning the judicial decisions that have already been made in similar cases. Common law is practiced in the US, Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom.
Common law courts usually use an adversarial system, in which two sides present their cases to a neutral judge. The adversarial system uses a competitive process between the prosecution and defence to determine the facts. The prosecution and defence compete against each other, and the judge serves as a referee to ensure fairness to the accused and that the legal rules of criminal procedure are followed. The judge in the adversarial system serves more as an arbiter between the claims of the prosecution and defence. The adversarial system assumes that the best way to get to the truth of a matter is through a competitive process to determine the facts and application of the law accurately.
In contrast, civil law systems proceed under an inquisitorial system in which an examining magistrate serves two roles by first developing the evidence and arguments for one side and then the other during the investigation phase. The inquisitorial process can be described as an official inquiry to ascertain the truth, and it grants more power to the judge who oversees the process.
The adversarial system is designed to preserve the rights of even the guilty by providing a fair and open venue for all parties to argue their case. In criminal matters, this means that the prosecuting body is required to prove—in most cases, beyond a reasonable doubt—to a judge and/or jury, the guilt of the accused, despite the accused’s arguments to the contrary. By presuming innocence until the prosecutor is able to prove otherwise, the court seeks to preserve the rights of the individual throughout a trial.
The adversarial system has been criticised for its aggressive and competitive nature, which can sometimes make it seem like a trial by combat.
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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 a flexible system that can respond to changes in society.
Common law draws from institutionalised opinions and interpretations from judicial authorities and public juries. It places an emphasis on precedent while allowing some freedom for interpretation.
Common law is practised in Australia, Canada, the United States, Hong Kong, India, New Zealand, the United Kingdom, and some Caribbean jurisdictions.
Civil law is a comprehensive, codified set of legal statutes created by legislators. Common law, on the other hand, is based on court decisions rather than codes or statutes. Civil law clearly defines the cases that can be brought to court, while common law allows courts to address situations not originally predicted by lawmakers.
While I cannot find specific information about district courts, common law is largely based on precedent, meaning the judicial decisions that have already been made in similar cases. In the US, most common law is found at the state level, with a limited body of federal common law created and applied by federal courts.































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