With thanks to David Yoo for contributions to this portion of the guide.
John Reitz suggests the following basic principles of the comparative method in John C. Reitz, How To Do Comparative Law, 46 American Journal of Comparative Law 617 (1998).
Edward J. Eberle suggests the structured comparative law methodology in Edward J. Eberle, The Methodology of Comparative Law, 16 Roger Williams University Law Review 51 (2011).
Mark Van Hoecke proposes a toolbox, rather than a fixed methodological road map, for comparative law research in Mark V. Hoecke, Methodology of Comparative Legal Research 1 (2015). He distinguishes six different methods for comparative research.
Hoecke also distinguishes levels of comparison as follows:
Comparative law is not a separate body of rules and principles, but is a method of the comparative study of two or more different legal systems. Publications on comparative law may compare legal traditions and institutions, compare the law and legal systems of two or more different countries in general, or compare the law of different countries for specific subjects. Research in comparative law may involve finding choice of law rules, constitutions of other countries, statutes and legislation, decisions of constitutional courts or the courts of last resort, and secondary sources, particularly treatises.
1. Identify your legal issue. What question or issue do you want to compare across jurisdictions? You may want current awareness and news sources to find a novel question for your research.
2. Choose jurisdictions to compare. What are their similarities and differences? For this, you may want to review research guides and country background reports to determine the selected countries' legal systems and find the points of comparison in their legal institutions.
3. Find secondary sources. These may include treatises and scholarly articles, either comparative works, or on the law of each jurisdiction. These will give you descriptions of the legal institutions for each country, analysis and interpretation of the law, and citations and keywords for continuing your research.
4. Gather primary materials. Legal research guides will help you find these. You may need subscription databases, government sources, or print materials, and you may need interlibrary loan to find them. These will include constitutions, judicial decisions, and statutes.
5. Update your research as needed. Have laws you found been superseded? Are your secondary sources reviewing current law?
6. At every stage, take good notes. Keep track of what sources you have used and what search terms you used. Note the citations for everything in your notes.
Foreign law jurisdictions may be either civil law or common law jurisdictions, or sometimes use customary or religious law or a mix of those with civil or common law.
In civil law jurisdictions, stare decisis may not apply, so court decisions may include few citations and little background on the facts of the case. Full-text opinions may not be published. Codes are usually well-organized and each article may provide a complete picture of that area of the law. The standard codes are civil, civil procedure, criminal or penal, and commercial, but modern systems may have many more codes. The official legal publication for statutes and sometimes regulations or case law is an official gazette or official journal. There is a written constitution. Scholarly writings are influential but are still secondary. Constitutional and administrative courts can nullify laws and regulations, and although there is no precedent in theory, judges and lawyers do look to prior decisions. For more explanation of civil law systems, see the Federal Judicial Center’s A Primer on the Civil-Law System.
Civil law systems are found in most of Europe, Latin America, and parts of Asia and Africa. Civil law evolved from Roman law. There is usually a distinction between public and private law, and between ordinary and administrative courts.
In common law jurisdictions, stare decisis applies: case law serves as precedent for later decisions and decisions of lower courts. There are usually citators (like Shepards and Keycite) for verifying the status of case law precedents. Judicial opinions are primary authority along with statutes and the constitution, and they are more detailed than in civil law jurisdictions, and there is more reporting of cases. Codes and statutes also serve as legal authority. There may not be a single constitution or code. The United Kingdom and its former colonies (including the United States) have common law systems, or mixed systems including common law.
Customary law is part of some countries' legal systems. It is generally unwritten and based in the community, with law on personal conduct, inheritance, property, and family law. It is difficult to research; try searching in secondary sources and for judicial notice of customary law in caselaw.
Religious law makes up most or part of come countries' legal systems. The two main religious legal systems are Islamic and Judaic. It governs family law, personal status, and inheritance, but may make up more of the law in some countries. Research religious law in religious texts, scholarly writings, and published caselaw.
Mixed legal systems include elements of multiple legal systems. Countries with customary or religious legal systems are usually common or civil law systems as well.
Find the legal system for a jurisdiction in:
Sources on Judicial, Court, and Legislative Systems:
Rule of Law:
An important question is how well the country adheres to the rule of law. How much protection do fundamental and constitutional rights receive? Is there corruption, making reliance on legal protections problematic? How has the constitution of the country evolved?