In a recent study of online evaluation skills, professional fact-checkers easily beat out undergraduate students and historians with PhDs in a contest to identify the trustworthiness of online information. How? Lateral reading.

Reading laterally means evaluating a source by leaving the site and consulting what other sources have to say about it. Lateral reading is often contrasted with vertical reading. 

Here’s an example of vertical reading. When evaluating a web site, if you’re making judgements based on features internal to the site, such as content, design, URL, you’re reading vertically. Most students have learned and practiced this type of evaluation at some point.

Contrast that with lateral reading, where you research the source on other sites before deciding whether you use or share the source.

To try lateral reading:

  • Search Google and Wikipedia to find additional new commentary about the original source. Try searching on publication names, funding organization, author, specific controversial facts in the content or the original source.
  • Try to find 3 to 5 new sources that comment on your original source. If you find it difficult to find these secondary sources, then conclude that your original sources is not well established, and be cautious about using it.
  • Make a judgment call about the original source's trustworthiness based on the information you found from secondary sources.

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