Comparative Legal Analysis — Comparing Law Across Jurisdictions

The functional approach, developed by Zweigert and Kötz, holds that the proper unit of comparison is not the formal legal rule but the social function it serves — the problem it is designed to solve. Because different systems may achieve the same result through formally different rules (e.g. the trust in common law versus fiducie in civil law), focusing on function rather than form enables genuine comparison. It is recommended because it avoids the 'false friend' trap and reveals functional equivalents that purely textual comparison would miss.

There is no fixed minimum or maximum, but the depth-breadth trade-off is real. A bilateral comparison (two jurisdictions) allows the greatest depth of analysis; comparisons involving five or more systems typically sacrifice depth for breadth. The number should be driven by the research question: if the aim is to identify the dominant global approach, a wider survey is justified; if the aim is to understand why two neighbouring systems diverged, a paired comparison is more appropriate.

Ideally, yes. Legal concepts are embedded in language, and translations — even expert ones — can obscure distinctions that matter. For major legal systems, translated statutes and case law are available and serviceable for an initial survey, but conclusions about fine doctrinal points should be verified against the original. Where language competence is lacking, co-authorship with a native legal scholar from the jurisdiction in question is the standard scholarly practice.

International law research focuses on norms that bind states by treaty or custom — rules that operate between states. Comparative legal analysis focuses on domestic legal rules and how different national systems handle a shared legal problem. The two approaches are often complementary: comparative analysis informs the design of international instruments, and international obligations shape the domestic legal landscape being compared.

Yes, and increasingly scholars combine both. Doctrinal comparative analysis identifies what the law says; empirical methods (surveys, court record analysis, experiments) reveal how it operates in practice. This 'law in action' perspective is particularly important when comparing systems where formal rules are similar but enforcement or judicial culture differs substantially.