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Legal system

Set of legal norms

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Through Jurisdiction, Jurisprudence and Nation state

The term "legal system" is often used to refer specifically to the laws of a particular nation state. Some countries have a single legal system, while others may have multiple overlapping legal systems arising from distinct sources of sovereign authority, as is often the case in federal states. In addition, different groups within a country are sometimes subject to different legal systems; this is known as legal pluralism. International law is also sometimes classified as a legal system, but this classification is disputed.

Legal systems vary in their sources of law and the extent to which they are based on formal written law; some civil law systems have been based exclusively on statutory law, while some customary law systems are based entirely on oral tradition.

Legal systems are classified in many different ways. One popular classification divides them into the civil law tradition, common law tradition, religious law systems, customary law systems, and mixed legal systems. Modern scholarship, however, has moved away from these fixed categories toward an understanding of legal systems as drawing from multiple legal traditions or patterns.

Definitions and scope

Legal systems have been defined in various ways. In one influential definition by John Henry Merryman, a legal system is "an operating set of legal institutions, procedures, and rules."

Depending on the definition, a legal system may contain only the set of laws or legal norms issuing from a particular sovereign authority or bound by a shared underlying norm or set of rules, or it may also include for example the institutions and processes by which those laws or legal norms are interpreted and given effect.

The 19th century legal positivist John Austin distinguished legal systems from one another based on the sovereign from which the laws flowed. A similar analysis had been proposed some centuries earlier by Francisco de Vitoria. Under Austin's analysis, any law that is part of a legal system must have been enacted by the same sovereign legislator. The 20th century Austrian scholar Hans Kelsen took a different approach, in which all legal norms in a legal system must arise from a single underlying basic norm.

English theorist H.L.A. Hart argued instead that each legal system is defined by a shared rule of recognition under which a pronouncement is recognized as valid law.

These positivist accounts of the legal system have been challenged from various perspectives. 20th century scholarship on legal pluralism emphasized that many legal norms do not arise from an identifiable government or sovereign, and therefore legal systems could not be defined simply based on the sovereign. H. Patrick Glenn argued that legal systems were a structurally inadequate way of thinking about law because they failed to capture the epistemic and ill-defined nature of law, arguing for legal traditions as a better unit of analysis.

Scholarly opinions on whether international law is a legal system have varied. Kelsen viewed international law as either included in all national legal systems, or an overarching legal system of which the national legal systems were subordinate parts. H.L.A. Hart considered international law to be law, but not a legal system, because it lacked a rule of recognition, rule of change, or rule of adjudication. However, it is increasingly considered to be a legal system. The origin of this view of international law is credited to the 18th century German legal theorist Georg Friedrich von Martens.

Although the terms "legal order" and "legal system" are commonly used interchangeably, some writers have distinguished them. A number of legal positivists have used one term to refer to the set of legal norms in effect in a territory at a particular moment, and the other to refer to the set of legal norms over time. Theorists such as Eugenio Bulygin and Carlos Alchourrón use "legal order" to refer to the momentary state of the "legal system", while others including Andrzej Grabowski use "legal system" in the opposite sense, to refer to the momentary state of the "legal order".

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