Case law research is a core competency in legal practice, international relations scholarship, and policy analysis. It involves identifying judicial opinions—from domestic courts, regional tribunals such as the European Court of Human Rights, or international bodies like the International Court of Justice (ICJ) and the International Criminal Court (ICC)—that interpret statutes, treaties, or customary norms relevant to a research question.
The process typically proceeds in stages. First, the researcher frames the legal issue and identifies relevant jurisdictions and sources of law. Second, they search primary databases (Westlaw, LexisNexis, HeinOnline, the ICJ's online docket, EUR-Lex, or court-specific reporters) using keywords, citators, and topical digests. Third, they read decisions carefully, distinguishing the holding (the binding legal rule) from dicta (non-binding remarks) and identifying the ratio decidendi. Fourth, they verify whether a decision is still good law using citator tools such as Shepard's or KeyCite, which flag overruled, distinguished, or criticized opinions.
For international researchers, case law research extends beyond common-law precedent. While the ICJ Statute (Article 59) provides that decisions bind only the parties to a case, in practice ICJ jurisprudence carries strong persuasive weight, and Article 38(1)(d) lists judicial decisions as a subsidiary means for determining international law. Researchers also consult arbitral awards, WTO Appellate Body reports, and human rights treaty body decisions.
Effective case law research requires understanding court hierarchies, the binding vs. persuasive distinction, and how legal reasoning evolves over time through doctrines like stare decisis in common-law systems or jurisprudence constante in civil-law traditions. For Model UN delegates and think-tank researchers, case law often supplies the concrete factual and doctrinal backbone needed to argue how a state, tribunal, or international institution has previously addressed an issue—strengthening position papers, policy memos, and advocacy briefs with verifiable authority rather than abstract principle.
Example
When preparing for the 2024 South Africa v. Israel proceedings at the ICJ, legal teams conducted extensive case law research drawing on the Court's 2007 Bosnia v. Serbia genocide judgment to frame arguments on the scope of state obligations under the Genocide Convention.
Frequently asked questions
Statutory research focuses on legislative texts (statutes, regulations, treaties), while case law research examines how courts have interpreted and applied those texts in specific disputes.
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