Westlaw Research Techniques

Mastering Westlaw is not just a clerical skill—it is a core competency for any legal professional. Efficient navigation of this powerful database directly translates to stronger arguments, more accurate advice, and substantial time savings. The systematic techniques needed to move from a general question to precisely on-point authority ensure your research is both comprehensive and validated.

Foundational Search Strategies: Natural Language vs. Terms and Connectors

Your first critical choice in Westlaw is selecting a search method. Natural language searching allows you to phrase a query as a plain English question, such as "Can a landlord enter a tenant's apartment without notice in an emergency?" Westlaw's algorithm identifies key concepts and synonyms to return relevant results. This is an excellent starting point when you are new to a legal area or when your issue is factually complex and difficult to distill into keywords.

For precision and control, you must use terms and connectors searching (also called Boolean searching). This method uses logical operators to define the relationship between your search terms. The most common connectors are:

• AND (+): Finds documents containing all specified terms (e.g., dog AND bite).
• OR (,): Finds documents containing any of the specified terms, great for synonyms (e.g., canine, dog).
• " ": Finds the exact phrase (e.g., "attractive nuisance").
• /p: Requires terms to be in the same paragraph.
• /s: Requires terms to be in the same sentence.
• !: The root expander, which finds all endings of a word (e.g., neglig! finds negligent, negligence, negligently).

A skilled terms-and-connectors search might look like: "landlord" /s enter! /s tenant /s apartment /s (emergency OR "immediate danger"). This pinpoints the legal relationship and context far more effectively than a natural language query. As a rule, use natural language for exploratory research and terms and connectors when you need to filter a large set of results or target specific legal language.

Validating Law with KeyCite

Finding a relevant case or statute is only half the battle; you must verify that it is still good law. This is the exclusive function of KeyCite, Westlaw's integrated citator service. KeyCite uses a system of flags and symbols to instantly show the current status of any authority.

A red flag next to a case indicates it is no longer good for at least one point of law—it may have been overruled or reversed. A yellow flag signals some negative history, such as a criticism or limitation. No flag typically means the case has not been negatively treated. Beyond the flag, the KeyCite display shows a depth of treatment stars system for citing references, indicating how extensively another source discusses your case. You must always check KeyCite for every primary source you intend to rely upon. Ignoring this step risks building an argument on overturned or weakened precedent, a fundamental and avoidable error.

Expanding and Focusing Research Using Headnotes and Filters

Westlaw's editorial enhancements are powerful tools for both broadening and narrowing your research. Headnotes are short summaries of a single legal point from a case, written by Westlaw's editors and assigned a Topic and Key Number within the West Key Number System. When you find one good case, you can click on the Topic or Key Number from a relevant headnote to retrieve all cases nationwide that discuss that same specific legal issue. This is the most reliable method for finding analogous authority and ensuring you haven't missed a crucial case.

Once you have a set of results, use filters to narrow them efficiently. You can filter by jurisdiction, date, court level, document type (e.g., just dissenting opinions), or even by the presence of specific search terms in particular sections of the document (like the synopsis or headnotes). For instance, after a broad search on product liability, you could filter to only Illinois appellate cases from the last five years that mention the term "failure to warn" in the headnotes. Strategic filtering saves you from manually sifting through hundreds of irrelevant documents.

Common Pitfalls

1. Over-Reliance on Natural Language: While convenient, natural language searches can miss critical authorities that use different terminology. Correction: After an initial natural language search, craft a parallel terms-and-connectors query using the synonyms and connectors gleaned from your best results to ensure comprehensive coverage.

1. Misusing or Overusing the "AND" Connector: Using AND between every term (e.g., landlord AND enter AND tenant AND apartment AND emergency) creates an overly restrictive search that may exclude relevant cases discussing the concept with slightly different wording. Correction: Use proximity connectors like /s and /p to capture relationships, and employ OR to include synonyms (e.g., (landlord, lessor)).

1. Skipping KeyCite or Misreading the Flag: Assuming a case is good because it appears in search results is a dangerous mistake. Similarly, seeing a yellow flag and dismissing the case entirely is an overreaction. Correction: Always click the KeyCite flag. Review the negative treatment for a yellow-flagged case; it may still be usable for a portion of its holding, but you must acknowledge the criticism in your analysis.

1. Ignoring Headnotes as a Research Pathway: Treating headnotes merely as a case summary overlooks their primary function as a classification system. Correction: When you find the perfect fact pattern or legal rule in a headnote, use its Topic and Key Number link to find all other cases discussing that identical point of law.

Summary

• Choose your search method strategically: Use natural language for initial exploration and terms and connectors for precise, controllable queries using operators like AND, OR, /p, and !.
• Always validate authority with KeyCite: Never rely on a case or statute without checking its red or yellow status flag to confirm it remains good law.
• Use headnotes to expand research efficiently: Click on Westlaw's editorial Topic and Key Numbers from a relevant headnote to find all cases on that specific legal issue across jurisdictions.
• Employ filters to narrow results systematically: Use jurisdiction, date, court level, and field filters to refine large result sets into a manageable, relevant collection.
• Research is an iterative process: Move fluidly between search methods, KeyCite, and headnote exploration, letting each step inform the next to build a complete and validated understanding of the legal landscape.