Evaluating the authority, usefulness, and reliability of resources is a crucial step in developing a literature review that effectively covers pertinent research as well as demonstrating to the reader that you know what you're talking about. The process of evaluating scholarly materials also enhances your general skills and ability to:
Black, Thomas R. Evaluating Social Science Research: An Introduction. London: Sage, 1993.
The act of thinking critically about the validity and reliability of a research resource generally involves asking yourself a series of questions about the quality of both the item and the content of that item.
Evaluating the Source
Inquiring about the Author
What are the author's credentials, such as, institutional affiliation [where he or she works], educational background, past writings, or experience? Is the book or article written on a topic in the author's area of expertise? Has your instructor mentioned this author? Have you seen the author's name cited in other sources or bibliographies? Is the author associated with a reputable institution or organization? What are the basic values or goals of that organization or institution?
Inquiring about the Date of Publication
When was the source published? Is the source current or out-of-date for your topic?
Inquiring about the Edition or Revision
Is this a first edition of this publication or not? Further editions usually indicate a source has been revised and updated to reflect changes in knowledge, to include prior omissions, and to better harmonize the contents with the intended needs of its readers. If you are using a web source, do the pages indicate last revision dates?
Inquiring about the Publisher
Note the publisher. If the source is published by a university press, it is likely to be scholarly. Although the fact that a publisher is reputable does not necessarily guarantee quality, it does show that the publisher has a high regard for the source being published [their reputation as an academic publisher relies on it].
Inquiring about the Title of Journal
Is this a scholarly or a popular journal? This distinction is important because it indicates different levels of complexity in conveying ideas and the intended readership.
Evaluating the Content
What type of audience is the author addressing? Is the publication aimed at a specialized or a general audience? Is this source too elementary, too technical, too advanced, or just right for your needs?
Is the information covered considered to be fact, opinion, or propaganda? It is not always easy to separate fact from opinion. Facts can usually be verified; opinions, though they may be based on factual information, evolve from the interpretation of facts. Does the information appear to be valid and well-researched, or is it questionable and unsupported by evidence? Note errors or omissions. Are the ideas and arguments advanced more or less in line with other works you have read on the same topic?
Does the work update or clarify prior knowledge, substantiate other materials you have read, or add new information? Does it extensively or only marginally cover your topic? Does it provide a balanced perspective? If the item in question does not meet this criteria, you should review enough sources to obtain a variety of viewpoints.
Is the publication organized logically? Are the main points clearly presented? Do you find the text easy to read, or is it stilted or choppy? Is the author's argument repetitive?
In the case of books, locate critical reviews of the work in a database such as Book Review Index. Is the review positive? Is the book under review considered a valuable contribution to the field? Do reviewers agree on the value or attributes of the book or are there strong differences of opinion? Does the reviewer mention other books that might be better? If so, locate these sources for more information on your topic.
Brand-Gruwela, Saskia and Marc Stadtlerb. “Solving Information-based Problems: Evaluating Sources and Information.” Learning and Instruction 2 (April 2011): 175-179; Barzilaia, Sarit and Anat Zohara. “Epistemic Thinking in Action: Evaluating and Integrating Online Sources.” Cognition and Instruction 30 (2012): 39-85; Critical Thinking. Academic Skills Centre. University of Canberra; Evaluating Sources. Lakeland Library Research Guides. Lakeland Community College; Evaluating Sources. Writing@CSU. Colorado State University; Evaluating Print Sources. The Writing Center. University of North Carolina; Evaluation During Reading. The Writing Lab and The OWL. Purdue University; Walraven, Amber, Saskia Brand-Gruwel, and Henny P.A. Boshuizen. “How Students Evaluate Information and Sources When Searching the World Wide Web for Information.” Computers and Education 52 (January 2009): 234–246
Web Content Requires Additional Methods of Evaluation
A report from the Stanford University Graduate School of Education found that students evaluating information that flows across social media channels or retrieved from online search engines like Google or Bing, have difficulty distinguishing advertisements from news articles or how to identity where the content came from. In general, the principles that guide your evaluation of print materials also applies to online resources. However, the interactive and multimedia dynamics of digital content increases the level of assessment you must apply to a resource in order to obtain confidence that what you are viewing is valid and credible.
Additional things to look for when considering using an online resource include:
Evaluating Internet Information. Online Library Learning Center. University of Georgia; Evaluating Internet Sources: A Library Resource Guide. Olsen Library. Northern Michigan University; Evaluating Sources. Writing@CSU. Colorado State University; Evaluating Web Sites. Teaching and Learning Services, University of Maryland Libraries; Ostenson, Jonathan. “Skeptics on the Internet: Teaching Students to Read Critically.” The English Journal 98 (May, 2009): 54-59; Stanford History Education Group. "Evaluating Information: The Cornerstone of Civic Online Reasoning." Stanford, CA: Graduate School of Education, 2016; Writing from Sources: Evaluating Web Sources. The Reading/Writing Center. Hunter College.
Bias, whether done intentionally or not, occurs when a statement reflects a partiality, preference, or prejudice for or against an object, person, place, or idea. Listed below are problems to look for when determining if the source is biased.
NOTE: The act of determining bias in scholarly research is also an act of constant self-reflection. Everyone has biases. Therefore, it is important that you minimize the influence of your own biases by approaching the assessment of another person's research introspectively and with a degree of self-awareness.
Evaluating Sources. Lakeland Library Research Guides. Lakeland Community College; Podsakoff, Philip M. et al. “Common Method Biases in Behavioral Research: A Critical Review of the Literature and Recommended Remedies.” Journal of Applied Psychology 88 (October 2003): 879-903; Stereotypes and Biased Language. The Writing Lab and The OWL. Purdue University.