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eCore ENGL1213 Textbook

2.7 Evaluating Sources

Is the Source Relevant? 

At this point in your research process, you may have identified dozens of potential sources. It is easy for writers to get so caught up in checking out books and printing out articles that they forget to ask themselves how they will use these resources in their research. Now is a good time to get a little ruthless. Reading and taking notes takes time and energy, so you will want to focus on the most relevant sources.

You may benefit from seeking out sources that are current, or up to date. Depending on your topic, sources may become outdated relatively soon after publication, or they may remain useful for years. For instance, online social networking sites have evolved rapidly over the past few years. An article published in 2002 about this topic will not provide current information. On the other hand, a research paper on elementary education practices might refer to studies published decades ago by influential child psychologists. When using websites for research, look on the webpage to see when the site was last updated. Many non-functioning links are a sign that a website is not regularly updated. Do not be afraid to ask your instructor, tutors, and librarians for suggestions if you find that many of your most relevant sources are not especially reliable, or that your most reliable sources are not relevant.

To weed through your collection of books and articles, skim their contents. Read quickly with your research questions and subtopics in mind. The following tips explain how to skim to get a quick sense of what topics are covered. If a book or article is not especially relevant, put it aside. You can always come back to it later if you need to.

Tips for Skimming Books

1.  Read the book cover and table of contents for a broad overview of the topics covered.

2.  Use the index to locate more specific topics and see how thoroughly they are covered.

3.  Flip through the book and look for subtitles or key terms that correspond to your research.

Tips for Skimming Articles

1.  Journal articles often begin with an abstract or summary of the contents. Read it to determine the article’s relevance to your research.

2.  Skim the introduction and conclusion for summary material.

3.  Skim through subheadings and text features such as sidebars.

4.  Look for keywords related to your topic.


Is the Source Reliable?  

All information sources are not created equal. Sources can vary greatly in terms of how carefully they are researched, written, edited, and reviewed for accuracy. Common sense will help you identify obviously questionable sources, such as tabloids that feature tales of alien abductions, or personal websites with glaring typos. Sometimes, however, a source’s reliability—or lack of it—is not so obvious. To evaluate your research sources, you will use critical thinking skills consciously and deliberately.

Sources you encounter will be written for distinct purposes and with particular audiences in mind, which may account for differences such as the following:

• How thoroughly writers cover a given topic

• How carefully writers research and document facts How editors review the work

• What biases or agendas affect the content


A journal article written for an academic audience for the purpose of expanding scholarship in a given field will take an approach quite different from a magazine feature written to inform a general audience. Textbooks, hard news articles, and websites approach a subject from different angles as well. To some extent, the type of source provides clues about its overall depth and reliability. Use the following descriptions of types of sources to help you determine the quality of your sources.

High Quality Sources provide the most in-depth information. They are written and reviewed by subject-matter experts. Examples: books published by University presses and articles in scholarly journals, such as Mosaic: A Journal for the Interdisciplinary Study of Literature; trade books and magazines geared toward an educated general audience, such as Smithsonian Magazine; government documents; documents by reputable organizations, such as universities and research institutes.

Varied Quality Sources are often useful; however, they do not cover subjects in as much depth as high-quality sources, and they are not always rigorously researched and reviewed. Some, such as popular magazine articles or company brochures, may be written to market a product or a cause. Textbooks and reference books are usually reliable, but they may not cover a topic in great depth. Use them with caution. Examples: news stories and feature articles (print or online) from reputable newspapers, magazines, or organizations, such as The New York Times or the Public Broadcasting Service; popular magazine articles, which may or may not be carefully researched and fact checked; documents by businesses and nonprofit organizations.

Questionable Sources are often written primarily to attract a large readership or to present the author’s opinions, and they are not subject to careful review. Generally, avoid using these as final sources. If you want to use a source that fits into this category, then carefully evaluate it using criteria below. Examples: loosely regulated or unregulated media content, such as Internet discussion boards, blogs, free online encyclopedias, talk shows, television news shows with obvious political biases, personal websites, and chat rooms.


Even when you are using a type of source that is generally reliable, you will still need to evaluate the author’s credibility and the publication itself on an individual basis. To examine the author’s credibility—that is, how much you can believe of what the author has to say—examine his or her credentials. What career experience or academic study shows that the author has the expertise to write about this topic? Keep in mind that expertise in one field is no guarantee of expertise in another, unrelated area. For instance, an author may have an advanced degree in physiology, but this credential is not a valid qualification for writing about psychology. Check credentials carefully.

Just as important as the author’s credibility is the publication’s overall reputability. Reputability refers to a source’s standing and reputation as a respectable, reliable source of information. An established and well-known newspaper, such as The New York Times or The Wall Street Journal, is more reputable than a college newspaper put out by comparatively inexperienced students. A website that is maintained by a well- known, respected organization and regularly updated is more reputable than one created by an unknown author or group.

Whenever you consult a source, always think carefully about the author’s or authors’ purpose in presenting the information. Few sources present facts completely objectively. In some cases, the source’s content and tone are significantly influenced by biases or hidden agendas. Bias refers to favoritism or prejudice toward a particular person or group. For instance, an author may be biased against a certain political party and present information in a way that subtly—or not so subtly—makes that organization look bad. Bias can lead an author to present facts selectively, edit quotations to misrepresent someone’s words, and distort information. Hidden agendas are goals that are not immediately obvious but influence how an author presents the facts. For instance, an article about the role of beef in a healthy diet would be questionable if it were written by a representative of the beef industry—or by the president of an animal- rights organization. In both cases, the author would likely have a hidden agenda.

As Jorge conducted his research, he read several research studies in which scientists found significant benefits to following a low-carbohydrate diet. He also noticed that many studies were sponsored by a foundation associated with the author of a popular series of low-carbohydrate diet books. Jorge read these studies with a critical eye, knowing that a hidden agenda might be shaping the researchers’ conclusions.

In sum, to evaluate a source, you should consider not only how current the source is but also criteria such as the type of source, its intended purpose and audience, the author’s (or authors’) qualifications, the publication’s reputation, any indications of bias or hidden agendas, and the overall professionalism of the source’s language, ideas, and design. You should consider these criteria as well as your overall impressions of sources’ quality. Read carefully, and notice how well authors present and support their statements. Stay actively engaged—do not simply accept sources’ words as truth.

Writing at Work

The critical thinking skills you use to evaluate research sources as a student are equally valuable when you conduct research on the job. If you follow certain periodicals or websites, you have probably identified publications that consistently provide reliable information. Reading blogs and online discussion groups is a great way to identify new trends and hot topics in a particular field, but these sources should not be your final sources if you’re doing substantial research.

This material is adapted from the following open textbook: 

Crowther, Kathryn; Curtright, Lauren; Gilbert, Nancy; Hall, Barbara; Ravita, Tracienne; and Swenson, Kirk, "Successful College Composition"

(2016). English Open Textbooks. 8.

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