Comparative law

Comparative law studies similarities and differences among legal systems, institutions, and rules across jurisdictions. It uses comparison to clarify how law works and how legal ideas travel.

Functional method: A comparative method that examines how different legal rules address similar practical problems. It makes unlike institutions comparable by focusing on the problems they solve.
Legal system: The institutions, rules, procedures, and practices through which a society creates and applies law. Comparative law treats legal systems as its broadest units of analysis.
Foreign law: The law of a jurisdiction other than the one whose legal system is under consideration. Foreign law supplies the material judges and lawmakers may consult comparatively.
Conflict of laws: The rules that determine which jurisdiction’s law applies to a dispute involving more than one legal system. Unlike comparative law, it resolves cross-border cases rather than primarily studying legal differences.
Legal convergence: The process by which legal systems or rules become more similar over time. Comparative work tests whether shared pressures produce genuine alignment or only surface resemblance.
Legal transplant: The movement of a legal rule, institution, or doctrine from one jurisdiction to another. Comparisons often trace how borrowed rules change in their new legal settings.
Jurisdiction: The authority of a court or other institution to make legal decisions over people, places, or matters. Jurisdiction identifies the legal territory or authority being compared.
Legal borrowing: The adoption or adaptation of legal rules and institutions from another jurisdiction. Comparative analysis can guide borrowing while exposing limits to importing rules.
International law: The body of rules governing relations among states and other subjects recognized by international law. It concerns rules between legal actors, while comparative law examines domestic systems against one another.
Legal divergence: The process by which legal systems or rules become more different over time. It counters assumptions that contact or modernization inevitably makes laws alike.

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