How to conduct case-law research
6 min read · Published 2026-08-22 · Last reviewed 2026-08-22
Written by LEX ZED Editorial Team · Reviewed by LEX ZED Editorial Review · Editorial policy · Methodology
Case-law research is not a hunt for one helpful quotation. It is the construction of a chain: the leading authority, the cases that have applied or qualified it, and the current position that results.
Find the leading case
Start from the statutory provision or the legal concept and look for the decision of the highest court that has addressed it directly. Textbooks and later judgments are useful signposts: a judgment that begins by citing an earlier decision as settling the point has identified the leading case for you.
Trace forwards
Having found the leading case, search for later judgments that cite it. Later treatment tells you whether the principle has been applied, confined to its facts, distinguished or departed from. A principle that has been repeatedly distinguished is weaker than its headline statement suggests, even if it has never been overruled.
Watch for statutory displacement
A line of authority can be rendered obsolete without any court saying so, simply because Parliament has legislated on the subject. Whenever a line of cases predates a relevant Act, check whether the Act now governs the question. This is the single most common way in which otherwise careful case-law research goes wrong.
Present the line, not just the conclusion
In a submission or an essay, set out the development: the leading authority and what it decided, the significant later treatment, and the position as it now stands. That structure is more persuasive than a list of citations and it demonstrates that the currency check was actually done.
Authoritative sources
Verify anything on this page against the primary materials published by:
Related guides
- How to analyse a court judgment — A working method for reading a judgment: separating facts from issues, finding the ratio decidendi, identifying obiter dicta and assessing how far the decision can be applied.
- How to find Zambian court judgments — Where judgments of the Supreme Court, Constitutional Court, Court of Appeal and High Court of Zambia are published, and how to search for them effectively.