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How to do legal research in 3 steps

Knowing where to start a difficult legal research project can be a challenge. But if you already understand the basics of legal research, the process can be significantly easier — not to mention quicker.

Solid research skills are crucial to crafting a winning argument. So, whether you are a law school student or a seasoned attorney with years of experience, knowing how to perform legal research is important — including where to start and the steps to follow.

What is legal research, and where do I start? 

Black's Law Dictionary defines legal research as “[t]he finding and assembling of authorities that bear on a question of law." But what does that actually mean? It means that legal research is the process you use to identify and find the laws — including statutes, regulations, and court opinions — that apply to the facts of your case.

In most instances, the purpose of legal research is to find support for a specific legal issue or decision. For example, attorneys must conduct legal research if they need court opinions — that is, case law — to back up a legal argument they are making in a motion or brief filed with the court.

Alternatively, lawyers may need legal research to provide clients with accurate legal guidance . In the case of law students, they often use legal research to complete memos and briefs for class. But these are just a few situations in which legal research is necessary.

Why is legal research hard?

Each step — from defining research questions to synthesizing findings — demands critical thinking and rigorous analysis.

1. Identifying the legal issue is not so straightforward. Legal research involves interpreting many legal precedents and theories to justify your questions. Finding the right issue takes time and patience.

2. There's too much to research. Attorneys now face a great deal of case law and statutory material. The sheer volume forces the researcher to be efficient by following a methodology based on a solid foundation of legal knowledge and principles.

3. The law is a fluid doctrine. It changes with time, and staying updated with the latest legal codes, precedents, and statutes means the most resourceful lawyer needs to assess the relevance and importance of new decisions.

Legal research can pose quite a challenge, but professionals can improve it at every stage of the process . 

Step 1: Key questions to ask yourself when starting legal research

Before you begin looking for laws and court opinions, you first need to define the scope of your legal research project. There are several key questions you can use to help do this.

What are the facts?

Always gather the essential facts so you know the “who, what, why, when, where, and how” of your case. Take the time to write everything down, especially since you will likely need to include a statement of facts in an eventual filing or brief anyway. Even if you don't think a fact may be relevant now, write it down because it may be relevant later. These facts will also be helpful when identifying your legal issue.

What is the actual legal issue?

You will never know what to research if you don't know what your legal issue is. Does your client need help collecting money from an insurance company following a car accident involving a negligent driver? How about a criminal case involving excluding evidence found during an alleged illegal stop?

No matter the legal research project, you must identify the relevant legal problem and the outcome or relief sought. This information will guide your research so you can stay focused and on topic.

What is the relevant jurisdiction?

Don't cast your net too wide regarding legal research; you should focus on the relevant jurisdiction. For example, does your case deal with federal or state law? If it is state law, which state? You may find a case in California state court that is precisely on point, but it won't be beneficial if your legal project involves New York law.

Where to start legal research: The library, online, or even AI?

In years past, future attorneys were trained in law school to perform research in the library. But now, you can find almost everything from the library — and more — online. While you can certainly still use the library if you want, you will probably be costing yourself valuable time if you do.

When it comes to online research, some people start with free legal research options , including search engines like Google or Bing. But to ensure your legal research is comprehensive, you will want to use an online research service designed specifically for the law, such as Westlaw . Not only do online solutions like Westlaw have all the legal sources you need, but they also include artificial intelligence research features that help make quick work of your research

Step 2: How to find relevant case law and other primary sources of law

Now that you have gathered the facts and know your legal issue, the next step is knowing what to look for. After all, you will need the law to support your legal argument, whether providing guidance to a client or writing an internal memo, brief, or some other legal document.

But what type of law do you need? The answer: primary sources of law. Some of the more important types of primary law include:

• Case law, which are court opinions or decisions issued by federal or state courts
• Statutes, including legislation passed by both the U.S. Congress and state lawmakers
• Regulations, including those issued by either federal or state agencies
• Constitutions, both federal and state

Searching for primary sources of law

So, if it's primary law you want, it makes sense to begin searching there first, right? Not so fast. While you will need primary sources of law to support your case, in many instances, it is much easier — and a more efficient use of your time — to begin your search with secondary sources such as practice guides, treatises, and legal articles.

Why? Because secondary sources provide a thorough overview of legal topics, meaning you don't have to start your research from scratch. After secondary sources, you can move on to primary sources of law.

For example, while no two legal research projects are the same, the order in which you will want to search different types of sources may look something like this:

• Secondary sources . If you are researching a new legal principle or an unfamiliar area of the law, the best place to start is secondary sources, including law journals, practice guides , legal encyclopedias, and treatises. They are a good jumping-off point for legal research since they've already done the work for you. As an added bonus, they can save you additional time since they often identify and cite important statutes and seminal cases.
• Case law . If you have already found some case law in secondary sources, great, you have something to work with. But if not, don't fret. You can still search for relevant case law in a variety of ways, including running a search in a case law research tool.

Once you find a helpful case, you can use it to find others. For example, in Westlaw, most cases contain headnotes that summarize each of the case's important legal issues. These headnotes are also assigned a Key Number based on the topic associated with that legal issue. So, once you find a good case, you can use the headnotes and Key Numbers within it to quickly find more relevant case law.

• Statutes and regulations . In many instances, secondary sources and case law list the statutes and regulations relevant to your legal issue. But if you haven't found anything yet, you can still search for statutes and regs online like you do with cases.

Once you know which statute or reg is pertinent to your case, pull up the annotated version on Westlaw. Why the annotated version? Because the annotations will include vital information, such as a list of important cases that cite your statute or reg. Sometimes, these cases are even organized by topic — just one more way to find the case law you need to support your legal argument.

Keep in mind, though, that legal research isn't always a linear process. You may start out going from source to source as outlined above and then find yourself needing to go back to secondary sources once you have a better grasp of the legal issue. In other instances, you may even find the answer you are looking for in a source not listed above, like a sample brief filed with the court by another attorney. Ultimately, you need to go where the information takes you.

Step 3: Make sure you are using ‘good’ law

One of the most important steps with every legal research project is to verify that you are using “good" law — meaning a court hasn't invalidated it or struck it down in some way. After all, it probably won't look good to a judge if you cite a case that has been overruled or use a statute deemed unconstitutional. It doesn't necessarily mean you can never cite these sources; you just need to take a closer look before you do.

The simplest way to find out if something is still good law is to use a legal tool known as a citator, which will show you subsequent cases that have cited your source as well as any negative history, including if it has been overruled, reversed, questioned, or merely differentiated.

For instance, if a case, statute, or regulation has any negative history — and therefore may no longer be good law — KeyCite, the citator on Westlaw, will warn you. Specifically, KeyCite will show a flag or icon at the top of the document, along with a little blurb about the negative history. This alert system allows you to quickly know if there may be anything you need to worry about.

Some examples of these flags and icons include:

• A red flag on a case warns you it is no longer good for at least one point of law, meaning it may have been overruled or reversed on appeal.
• A yellow flag on a case warns that it has some negative history but is not expressly overruled or reversed, meaning another court may have criticized it or pointed out the holding was limited to a specific fact pattern.
• A blue-striped flag on a case warns you that it has been appealed to the U.S. Supreme Court or the U.S. Court of Appeals.
• The KeyCite Overruling Risk icon on a case warns you that the case may be implicitly undermined because it relies on another case that has been overruled.

Another bonus of using a citator like KeyCite is that it also provides a list of other cases that merely cite your source — it can lead to additional sources you previously didn't know about.

Perseverance is vital when it comes to legal research

Given that legal research is a complex process, it will likely come as no surprise that this guide cannot provide everything you need to know.

There is a reason why there are entire law school courses and countless books focused solely on legal research methodology. In fact, many attorneys will spend their entire careers honing their research skills — and even then, they may not have perfected the process.

So, if you are just beginning, don't get discouraged if you find legal research difficult — almost everyone does at first. With enough time, patience, and dedication, you can master the art of legal research.

Thomson Reuters originally published this article on November 10, 2020.

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Legal Research Strategy

Preliminary analysis, organization, secondary sources, primary sources, updating research, identifying an end point, getting help, about this guide.

This guide will walk a beginning researcher though the legal research process step-by-step. These materials are created with the 1L Legal Research & Writing course in mind. However, these resources will also assist upper-level students engaged in any legal research project.

How to Strategize

Legal research must be comprehensive and precise.  One contrary source that you miss may invalidate other sources you plan to rely on.  Sticking to a strategy will save you time, ensure completeness, and improve your work product. 

Follow These Steps

Running Time: 3 minutes, 13 seconds.

Make sure that you don't miss any steps by using our:

• Legal Research Strategy Checklist

If you get stuck at any time during the process, check this out:

• Ten Tips for Moving Beyond the Brick Wall in the Legal Research Process, by Marsha L. Baum

Understanding the Legal Questions

A legal question often originates as a problem or story about a series of events. In law school, these stories are called fact patterns. In practice, facts may arise from a manager or an interview with a potential client. Start by doing the following:

• Read anything you have been given
• Analyze the facts and frame the legal issues
• Assess what you know and need to learn
• Note the jurisdiction and any primary law you have been given
• Generate potential search terms

Jurisdiction

Legal rules will vary depending on where geographically your legal question will be answered. You must determine the jurisdiction in which your claim will be heard. These resources can help you learn more about jurisdiction and how it is determined:

• Legal Treatises on Jurisdiction
• LII Wex Entry on Jurisdiction

This map indicates which states are in each federal appellate circuit:

Getting Started

Once you have begun your research, you will need to keep track of your work. Logging your research will help you to avoid missing sources and explain your research strategy. You will likely be asked to explain your research process when in practice. Researchers can keep paper logs, folders on Westlaw or Lexis, or online citation management platforms.

Organizational Methods

Tracking with paper or excel.

Many researchers create their own tracking charts.  Be sure to include:

• Search Date
• Topics/Keywords/Search Strategy
• Citation to Relevant Source Found
• Save Locations
• Follow Up Needed

Consider using the following research log as a starting place: 

• Sample Research Log

Tracking with Folders

Westlaw and Lexis offer options to create folders, then save and organize your materials there.

• Lexis Advance Folders
• Westlaw Edge Folders

Tracking with Citation Management Software

For long term projects, platforms such as Zotero, EndNote, Mendeley, or Refworks might be useful. These are good tools to keep your research well organized. Note, however, that none of these platforms substitute for doing your own proper Bluebook citations. Learn more about citation management software on our other research guides:

• Guide to Zotero for Harvard Law Students by Harvard Law School Library Research Services Last Updated Aug 9, 2024 547 views this year
• Zotero by Daniel Becker Last Updated Nov 5, 2024 38547 views this year

Types of Sources

There are three different types of sources: Primary, Secondary, and Tertiary.  When doing legal research you will be using mostly primary and secondary sources.  We will explore these different types of sources in the sections below.

Secondary sources often explain legal principles more thoroughly than a single case or statute. Starting with them can help you save time.

Secondary sources are particularly useful for:

• Learning the basics of a particular area of law
• Understanding key terms of art in an area
• Identifying essential cases and statutes

Consider the following when deciding which type of secondary source is right for you:

• Scope/Breadth
• Depth of Treatment
• Currentness/Reliability

For a deep dive into secondary sources visit:

• Secondary Sources: ALRs, Encyclopedias, Law Reviews, Restatements, & Treatises by Catherine Biondo Last Updated Apr 12, 2024 9634 views this year

Legal Dictionaries & Encyclopedias

Legal dictionaries.

Legal dictionaries are similar to other dictionaries that you have likely used before.

• Black's Law Dictionary
• Ballentine's Law Dictionary

Legal Encyclopedias

Legal encyclopedias contain brief, broad summaries of legal topics, providing introductions and explaining terms of art. They also provide citations to primary law and relevant major law review articles.  

Here are the two major national encyclopedias:

• American Jurisprudence (AmJur) (Westlaw)
• American Jurisprudence (Lexis)
• Corpus Juris Secundum (CJS)

Treatises are books on legal topics.  These books are a good place to begin your research.  They provide explanation, analysis, and citations to the most relevant primary sources. Treatises range from single subject overviews to deep treatments of broad subject areas.

It is important to check the date when the treatise was published. Many are either not updated, or are updated through the release of newer editions.

To find a relevant treatise explore:

• Legal Treatises by Subject by Catherine Biondo Last Updated Apr 12, 2024 8130 views this year

American Law Reports (ALR)

American Law Reports (ALR) contains in-depth articles on narrow topics of the law. ALR articles, are often called annotations. They provide background, analysis, and citations to relevant cases, statutes, articles, and other annotations. ALR annotations are invaluable tools to quickly find primary law on narrow legal questions.

This resource is available in both Westlaw and Lexis:

• American Law Reports on Westlaw (includes index)
• American Law Reports on Lexis

Law Reviews & Journals

Law reviews are scholarly publications, usually edited by law students in conjunction with faculty members. They contain both lengthy articles and shorter essays by professors and lawyers. They also contain comments, notes, or developments in the law written by law students. Articles often focus on new or emerging areas of law and may offer critical commentary. Some law reviews are dedicated to a particular topic while others are general. Occasionally, law reviews will include issues devoted to proceedings of panels and symposia.

Law review and journal articles are extremely narrow and deep with extensive references. 

To find law review articles visit:

• Law Journal Library on HeinOnline
• Law Reviews & Journals on LexisNexis
• Law Reviews & Journals on Westlaw

Restatements

Restatements are highly regarded distillations of common law, prepared by the American Law Institute (ALI). ALI is a prestigious organization comprised of judges, professors, and lawyers. They distill the "black letter law" from cases to indicate trends in common law. Resulting in a “restatement” of existing common law into a series of principles or rules. Occasionally, they make recommendations on what a rule of law should be.

Restatements are not primary law. However, they are considered persuasive authority by many courts.

Restatements are organized into chapters, titles, and sections.  Sections contain the following:

• a concisely stated rule of law,
• comments to clarify the rule,
• hypothetical examples,
• explanation of purpose, and
• exceptions to the rule  

To access restatements visit:

• American Law Institute Library on HeinOnline
• Restatements & Principles of the Law on LexisNexis
• Restatements & Principles of Law on Westlaw

Primary Authority

Primary authority is "authority that issues directly from a law-making body."   Authority , Black's Law Dictionary (11th ed. 2019).   Sources of primary authority include:

• Constitutions
• Statutes 

Regulations

Access to primary legal sources is available through:

• Bloomberg Law
• Free & Low Cost Alternatives

Statutes (also called legislation) are "laws enacted by legislative bodies", such as Congress and state legislatures.  Statute , Black's Law Dictionary (11th ed. 2019).

We typically start primary law research here. If there is a controlling statute, cases you look for later will interpret that law. There are two types of statutes, annotated and unannotated.

Annotated codes are a great place to start your research. They combine statutory language with citations to cases, regulations, secondary sources, and other relevant statutes. This can quickly connect you to the most relevant cases related to a particular law. Unannotated Codes provide only the text of the statute without editorial additions. Unannotated codes, however, are more often considered official and used for citation purposes.

For a deep dive on federal and state statutes, visit:

• Statutes: US and State Codes by Mindy Kent Last Updated Apr 12, 2024 6540 views this year
• 50 State Surveys

Want to learn more about the history or legislative intent of a law?  Learn how to get started here:

• Legislative History Get an introduction to legislative histories in less than 5 minutes.
• Federal Legislative History Research Guide

Regulations are rules made by executive departments and agencies. Not every legal question will require you to search regulations. However, many areas of law are affected by regulations. So make sure not to skip this step if they are relevant to your question.

To learn more about working with regulations, visit:

• Administrative Law Research by AJ Blechner Last Updated Apr 12, 2024 1132 views this year

Case Basics

In many areas, finding relevant caselaw will comprise a significant part of your research. This Is particularly true in legal areas that rely heavily on common law principles.

Running Time: 3 minutes, 10 seconds.

Unpublished Cases

Up to  86% of federal case opinions are unpublished. You must determine whether your jurisdiction will consider these unpublished cases as persuasive authority. The Federal Rules of Appellate Procedure have an overarching rule, Rule 32.1  Each circuit also has local rules regarding citations to unpublished opinions. You must understand both the Federal Rule and the rule in your jurisdiction.

• Federal and Local Rules of Appellate Procedure 32.1 (Dec. 2021).
• Type of Opinion or Order Filed in Cases Terminated on the Merits, by Circuit (Sept. 2021).

Each state also has its own local rules which can often be accessed through:

• State Bar Associations
• State Courts Websites

First Circuit

• First Circuit Court Rule 32.1.0

Second Circuit

• Second Circuit Court Rule 32.1.1

Third Circuit

• Third Circuit Court Rule 5.7

Fourth Circuit

• Fourth Circuit Court Rule 32.1

Fifth Circuit

• Fifth Circuit Court Rule 47.5

Sixth Circuit

• Sixth Circuit Court Rule 32.1

Seventh Circuit

• Seventh Circuit Court Rule 32.1

Eighth Circuit

• Eighth Circuit Court Rule 32.1A

Ninth Circuit

• Ninth Circuit Court Rule 36-3

Tenth Circuit

• Tenth Circuit Court Rule 32.1

Eleventh Circuit

• Eleventh Circuit Court Rule 32.1

D.C. Circuit

• D.C. Circuit Court Rule 32.1

Federal Circuit

• Federal Circuit Court Rule 32.1

Finding Cases

Headnotes show the key legal points in a case. Legal databases use these headnotes to guide researchers to other cases on the same topic. They also use them to organize concepts explored in cases by subject. Publishers, like Westlaw and Lexis, create headnotes, so they are not consistent across databases.

Headnotes are organized by subject into an outline that allows you to search by subject. This outline is known as a "digest of cases." By browsing or searching the digest you can retrieve all headnotes covering a particular topic. This can help you identify particularly important cases on the relevant subject.

Running Time: 4 minutes, 43 seconds.

Each major legal database has its own digest:

• Topic Navigator (Lexis)
• Key Digest System (Westlaw)

Start by identifying a relevant topic in a digest.  Then you can limit those results to your jurisdiction for more relevant results.  Sometimes, you can keyword search within only the results on your topic in your jurisdiction.  This is a particularly powerful research method.

One Good Case Method

After following the steps above, you will have identified some relevant cases on your topic. You can use good cases you find to locate other cases addressing the same topic. These other cases often apply similar rules to a range of diverse fact patterns.

• in Lexis click "More Like This Headnote"
• in Westlaw click "Cases that Cite This Headnote"

to focus on the terms of art or key words in a particular headnote. You can use this feature to find more cases with similar language and concepts.  ​

Ways to Use Citators

A citator is "a catalogued list of cases, statutes, and other legal sources showing the subsequent history and current precedential value of those sources.  Citators allow researchers to verify the authority of a precedent and to find additional sources relating to a given subject." Citator , Black's Law Dictionary (11th ed. 2019).

Each major legal database has its own citator.  The two most popular are Keycite on Westlaw and Shepard's on Lexis.

• Keycite Information Page
• Shepard's Information Page

Making Sure Your Case is Still Good Law

This video answers common questions about citators:

For step-by-step instructions on how to use Keycite and Shepard's see the following:

Additional Shepard's Resources

• Shepard's Video Tutorial
• Shepard's Handout
• Shepard's Editorial Phrase Dictionary
• Shepard's Signal Indicators & Analysis Phrases
• Shepard's Citation Services User Guide
• Lexis+ Support and Training Additional online videos and handouts for Lexis+.

Additional KeyCite Resources

• How to Ensure I'm Citing Good Law (Westlaw Video)
• KeyCite Handout
• KeyCite Editorial Phrase Dictionary
• Understanding Next Generation KeyCite
• How to Check the Status of a Case with KeyCite
• Westlaw Precision Support Additional videos and handouts to support your Westlaw research.

Using Citators For

Citators serve three purposes: (1) case validation, (2) better understanding, and (3) additional research.

Case Validation

Is my case or statute good law?

• Parallel citations
• Prior and subsequent history
• Negative treatment suggesting you should no longer cite to holding.

Better Understanding

Has the law in this area changed?

• Later cases on the same point of law
• Positive treatment, explaining or expanding the law.
• Negative Treatment, narrowing or distinguishing the law.

Track Research

Who is citing and writing about my case or statute?

• Secondary sources that discuss your case or statute.
• Cases in other jurisdictions that discuss your case or statute.

Knowing When to Start Writing

For more guidance on when to stop your research see:

• Terminating Research, by Christina L. Kunz

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• Last Updated: Aug 27, 2024 5:19 PM
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