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Evidence as a Form of Support

Evidence as a Form of Support

Author: Sophia Tutorial
Recognize how evidence is used to support an argument's claim
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what's covered
This tutorial covers the types of evidence that can be used in an essay to support assertions and convince readers:
  1. Types of Evidence
    1. Researched Evidence
  2. Evaluating Research
  3. Locating Sources and Avoiding Bias

1. Types of Evidence

Good argumentative writing requires support, including evidence, to convince readers that the writer's argument is valid. Evidence, one of the most common forms of support, is facts and details that bolster an argument. It is proof of the validity of an essay's claims. Evidence can include facts and data, personal research, citation of the research of others, and personal experiences. Although evidence can be useful in any mode of writing, it’s particularly important when making an argument. Writers who support their claims with evidence are more likely to convince readers to agree with them.

When making an argument, writers most often use researched evidence to support it.

term to know
Facts and details that support an argument

1a. Researched Evidence

Although there are other types of evidence, research is a common and effective way to support claims.

Research is a fact-finding process in which data, statistics, and ideas from other writers and sources are located and identified to support your ideas. Researched evidence is evidence that you have found in external sources.

During research, writers commonly investigate books, newspapers, websites, scholarly journals and experimental results for information that enables them to make convincing arguments.

Researched information can include the following sources:

Expert arguments These are the theories, arguments, or ideas proposed by experts in a field of interest.


If you’re writing a paper about psychology, you might use evidence taken from publications including the American Journal of Psychiatry.

Research findings These are data from surveys or research experiments.


If you’re writing about school lunch programs, you might use evidence provided by the U.S. Department of Education about how many students eat program-provided lunches nationwide.

First person data This is a first-person account of an experience, etc. provided by someone other than yourself.


If you’re writing an argument calling for increased funding for the Veterans Administration, you might include an interview with a veteran to describe why the VA is important to many people.

All of these types of research can be useful and can lead you to the application of good researched evidence.

terms to know
A fact-finding process in which data, statistics, and ideas from other writers and sources are located and identified to support your ideas
Researched Evidence
Evidence that you have found in other sources

2. Evaluating Research

Not all research is good or convincing. Good data should have the following qualities:

  • Current
  • Relevant
  • Unbiased
  • Rational

Data must be current. Statistics and theories that are out-of-date, or that have been disproved, are not useful.

Data must be relevant. It must be directly related to your argument.


If you want to make an argument for leash laws, data about zoos is probably not useful. You must locate sources that are relevant to your argument.

Note that your source does not need to make the same argument that you are making, but it must be related to your topic.

Data must be unbiased. If your source is biased, the evidence it provides might not be trustworthy. Think about the informative mode of writing, in which data are presented an unbiased manner — without taking a side on the issue. That’s the kind of data you need in order to take a position of your own, and to support that position believably and ethically.

Data must be rational. Some of the sources you encounter may not be rational, informed, or expert.


You may hold strong opinions about orcas (i.e., killer whales), but you should not be cited as a rational source if you don’t have any expertise on the subject. Your evidence would be based by your opinions, which may be incorrect.

Some sources, for example those that seek to advance "conspiracy theories," are based in irrational beliefs that are unsupported by facts. Avoid referencing such sources.

3. Locating Sources and Avoiding Bias

When looking for sources, news reports are often a good place to start. They may contain summaries of information that you can use directly in your essay, and that may lead to other sources.

However, although news reports can seem neutral, they are sometimes tainted by political or social biases. Make sure that your source is not partisan.

Libraries and library websites are a good source of scholarly publications. When you find a useful book or article, the bibliography in that publication can lead to additional resources.

Some websites provide a wealth of information. Blogs and commercial websites cannot be assumed to be unbiased, but they might provide useful first-person data. In contrast, websites that end in .gov or .edu often provide neutral and detailed research findings.

Wikipedia can be a good place to start research, but it is not a valid academic source because anyone can edit any page. The information cannot be verified.

When examining a source, ask yourself the following questions:

  • Who wrote this and when was it written?
    • Getting a sense of who the author is and the context of his or her work will indicate whether or not it is current, unbiased, and rational.
  • Who published this?
    • If you’re investigating a website or a news article, check the “masthead” of that publication. A masthead is a list of the people involved in the publication, and may include contact information. Regarding websites, look for a link to an “About Us” page (or something similar).
    • Use a search engine to find information on a news source, and also look at its Wikipedia page. This is a good way to make sure that a source is unbiased, and that you’re not accidentally citing humor or satire.
  • What are the methods?
    • To identify the methods used to achieve the results or findings provided by a source, look for a section called “Methodology.” This is particularly important for research experiments, polls, and similar data. If the methods indicate that the research has a narrow scope but is being applied broadly, that’s a warning sign that it isn’t reliable information.
  • What kind of information does this source cite?
    • If you review its bibliography, do you find good, trustworthy sources, or do the sources listed there appear biased?

Although there’s no sure-fire way to determine whether or not a source is valid, the more you research, the better you’ll become at distinguishing the good from the bad.

In this tutorial, the primary type of evidence used to support a written argument, researched evidence, was identified and examined. Researched evidence encompasses the facts and details that writers locate in other sources. Before using researched evidence in written work, it’s important to evaluate your research to ensure that it is correct, relevant, unbiased, and rational.

This tutorial also identified ways to locate sources and avoid bias. News reports and websites can be great sources of information, but it’s important to make sure that they present information in a neutral, factual way.

Terms to Know

Facts and details that support an argument.


Finding facts, data, statistics, and ideas from other writers and sources in order to support our own ideas.