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M E 324: Manufacturing Engineering

Guide to using library resources for students enrolled in ME324: Manufacturing Engineering.

Evaluating Information Sources

Use critical thinking to decide when information is useful, trustworthy, and relevant.

Not all information is created equal

Searching and locating information sources is only one part of the research process. An equally important part is being able to tell if the sources you've located are trustworthy, appropriate, and authoritative.

Sliding Scales

Think of source evaluation as a sliding scale: not as black / white, good / bad. While there are some sources a majority will agree are "good" or "bad" most information falls somewhere in between these two extremes and it's up to YOU to make a final decision.

How Much You Can Trust a Bearded Man?
A silly example of a sliding scale, The Trustworthiness of Beards by Matt McInerney. Click to enlarge.

How you use information will determine if it is "good" or "bad." For example, I may share a BuzzFeed article with my friends but I wouldn't cite it in a research paper.

Evaluating Sources with S.I.F.T.

SIFT is a helpful acronym that describes steps used to evaluate information sources. This an abbreviated version, for more information and guidance check out Chapter 2.9 "Evaluating Information Using SIFT" of the Library 160 textbook.


  • Check yourself. Recognize your own biases, beliefs, and potential blind spots and acknowledge that they will effect your judgment.
  • Stay on task. It is easy to get lost exploring interesting tangents while researching. If this happens stop and remember your original purpose. 

Investigate the Source

  • Who dis? You need to trust the authors and publisher if you plan to use a source. What is their reputation? How is the information presented (fact or opinion)? What's background? Are there any conflicts of interest?

Find better coverage

  • What else is out there? Before using a source check to see if the topic has been covered elsewhere. Has anyone else written about it? Do other publications provide more information? Do they tell the same story and contain the same facts? Try to locate additional sources that are more detailed, varied, transparent, authoritative, and/or build upon the information presented in your initial source.

Trace it back.

  • Context matters. Before trusting or reusing information, look for the original source. Who first wrote about the topic? When was it first published? Is it accurate? At this point, you may need to repeat steps I and F in order to evaluate a new information source.
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Erin Thomas
150 Parks Library
Iowa State University
515 294-9886