
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 is practised in several countries, including Australia, Canada, the United Kingdom, and the United States. Within the context of common law, a legal doctrine refers to a specific and formal set of principles or rules that provide a framework for analysing and deciding legal issues within a particular area of law. For example, the doctrine of parliamentary sovereignty asserts that Parliament has the authority to create legislation with common law principles in mind. One such principle is the Principle of Legality, which safeguards the fundamental rights, immunities, and freedoms of citizens against arbitrary power and ambiguous statutory interpretation.
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What You'll Learn

Common law rights
Common law is a body of unwritten laws based on legal precedents established by the courts. It is also known as case law and relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a particular case. Common law guides court rulings when the outcome cannot be determined based on existing statutes or written rules of law. It draws from institutionalized opinions and interpretations from judicial authorities and public juries.
Common law is distinguished from civil law, which is a comprehensive, codified set of legal statutes created by legislators. Civil law clearly defines the cases that can be brought to court, the procedures for handling claims, and the punishment for an offence. Judicial authorities use the conditions in the applicable civil code to evaluate the facts of each case and make legislative decisions. While civil law is regularly updated, the goal of standardized codes is to create order and reduce biased systems in which laws are applied differently from case to case.
Common law, on the other hand, evolved from a British tradition that spread to North America during the 17th and 18th centuries. Today, it is practised in Australia, Canada, Hong Kong, India, New Zealand, the United Kingdom, and the United States. In the US, common law plays a significant role, particularly in the Supreme Court, which interprets laws and constitutional provisions while adhering to previous rulings. This judicial reliance on past decisions has shaped constitutional law and influenced both civil and criminal cases.
The principle of stare decisis, or "let the precedent stand," is central to common law systems. It mandates that courts follow established precedents in their rulings. Over time, as judges began to regard each other's decisions as binding precedent, a system of common law was established throughout the country. This system allows for consistent outcomes by applying the same standards of interpretation. However, it can also make it difficult for marginalised parties to pursue favourable rulings until popular thought or civil legislation changes the interpretation of common law.
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Precedent and stare decisis
Common law, 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 is practised in several countries, including Australia, Canada, the United Kingdom, and the United States.
The doctrine of stare decisis is a fundamental principle of common law systems. It holds that similar cases should be decided similarly, based on the principle of consistency and predictability in the law. This doctrine ensures that the law treats similar cases in a like manner, promoting fairness and equality before the law. Stare decisis provides stability and certainty to the legal system, allowing individuals to reasonably predict how the law will apply in given situations.
The application of stare decisis involves considering the facts and legal principles of previous cases and determining their relevance to the current case. Judges play a crucial role in this process, as they have the authority to interpret and apply precedents. They may consider factors such as the similarity of the facts, the legal principles involved, and the persuasiveness of the prior decision.
However, it is important to note that stare decisis is not an absolute rule and may have limitations. In some instances, courts may depart from precedent due to various reasons, such as changing social values, new legislation, or a higher court's ruling. Additionally, the weight given to precedents can vary depending on the jurisdiction and the specific circumstances of the case.
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Common law and civil law differences
The terms "common law" and "civil law" refer to legal systems. Common law, 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. Common laws sometimes prove the inspiration for new legislation to be enacted. Common law originated in medieval England and is currently used in many countries that were formerly under English rule, including the United States, Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom.
Civil law, on the other hand, is a comprehensive, codified set of legal statutes created by legislators. A civil system clearly defines the cases that can be brought to court, the procedures for handling claims, and the punishment for an offense. Judicial authorities use the conditions in the applicable civil code to evaluate the facts of each case and make legislative decisions. Civil law is regularly updated, and the goal of standardized codes is to create order and reduce biased systems in which laws are applied differently from case to case. Most continental European countries have comprehensive codes.
One key difference between common law and civil law is their approach to precedent. In common law systems, judicial decisions are binding precedent, meaning that decisions of the highest court can generally only be overturned by that same court or through legislation. This is not the case in civil law systems, where prior decisions of a court are not binding on future decisions. In civil law, the court is required to follow the legal code, but the interpretation of that code is not binding, and the court may later interpret the law differently.
Another difference lies in the flexibility of the two systems. Common law systems have greater flexibility in granting different types of security over assets, and they also have the concept of trusts, which enable security interests to be held by a trustee without the need for formal transfer or re-registration of security interests in the names of new lenders. In contrast, civil law does not have a concept of trusts, and security interests generally need to be re-registered in the name of the new lender, incurring additional costs.
In summary, common law and civil law differ in their underlying philosophies, with common law relying on judicial precedent and institutionalized opinions, while civil law is based on codified legal statutes created by legislators. Common law systems offer greater flexibility in certain areas, such as asset security and the concept of trusts, while civil law provides a comprehensive and standardized framework that aims to reduce bias and inconsistency in the application of laws.
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Common law in practice
Common law, 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 is practised in several countries, including Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom, and previously, its colonies.
The development of common law can be traced back to the 13th century in England, with the earliest known compilation of court cases, known as the "Year Books", published in 1268. These annual publications are considered the principal source of knowledge for the evolving legal doctrines, concepts, and methods of that time. The common law system, as we know it today, evolved from British traditions during the 17th and 18th centuries and spread to North America during the colonial period.
In contrast to civil law, common law does not rely on a comprehensive, codified set of legal statutes. Instead, it is characterized by its flexibility and adaptability, often shaping new legislation. A precedent, known as stare decisis, forms the basis for evaluating future cases with similar circumstances. This means that judges rely on past rulings to guide their decisions, promoting consistency in legal outcomes.
The absence of a formal written constitution in some countries, such as Israel, allows for the dynamic nature of common law. In Israel, the basic principles of law resemble those of British and American law due to their historical mandate. The authority of the supreme court to review and overturn legislative and executive decisions is a key feature of their legal system.
Common law plays a crucial role in safeguarding citizens' fundamental rights, as exemplified by the Principle of Legality. This principle ensures that ambiguous statutory language does not infringe upon established common law rights, freedoms, and immunities. For instance, in the case of North Australian Aboriginal Justice Agency Limited v Northern Territory (2015), the Principle of Legality was applied to protect common law rights.
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Common law and the principle of legality
Common law, 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 is practised in several countries, including Australia, Canada, the United Kingdom, and the United States.
The principle of legality is a common law presumption that seeks to protect citizens from arbitrary power. It is rooted in the understanding that Parliament creates legislation with common law principles in mind and does not intend to interfere with fundamental common law rights, immunities, and freedoms. The judiciary uses the principle of legality to safeguard these rights when an ambiguity arises in statutory interpretation.
The principle of legality operates as a check and balance on the power of Parliament. It empowers the judiciary to confine ambiguous evidence of legislative intent to only what the words expressly and ordinarily reveal, thereby safeguarding citizens' fundamental rights. An example of the application of the principle of legality is the case of North Australian Aboriginal Justice Agency Limited v Northern Territory (2015), where the court's interpretation favoured the protection of fundamental common law rights.
In Australia, the principle of legality has been applied to protect various fundamental rights, including the rights to private property, personal liberty, freedom of expression, freedom of movement, natural justice, and access to the courts. The Australian courts' role involves interpreting legislation that might impinge on rights or impose an inappropriate burden on citizens, thereby providing a common-law bill of rights and protecting civil liberties from state invasion.
The principle of legality is not absolute and can be rebutted. For example, in the case of Momcilovic v The Queen (2011), it was held that where statutory language gives rise to an interference with fundamental common law rights, the principle of legality is "of no avail against such language". Similarly, while the presumption that legislation is intended to be consistent with fundamental rights provides a substantial level of protection, it can be overridden by sufficiently clear words indicating an intention to interfere with those rights.
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Frequently asked questions
A legal doctrine is a framework, set of rules, procedural steps, or test, often established through precedent in the common law, through which judgments can be determined in a given legal case.
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.
The Principle of Legality is a common law presumption that seeks to protect citizens from arbitrary power. It presumes that Parliament does not intend to interfere with fundamental common law rights, immunities, and freedoms.







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