What does it mean for an article to be peer-reviewed?
When a researcher submits an article to a scholarly journal, a journal editor does a first pass to see if the article looks decent. Then they usually remove the name of the author and send it out to a few other experts in the field to see what they think of the article. The experts send back feedback on the article, and the journal editor decides based on that feedback whether to publish the article, or ask for revisions from the author, or deny it outright. This process is called peer-review. (However, peer-review is not foolproof: sometimes those experts miss mistakes or fraud.)
Most academic journals use the peer-review process, but some academic journals don't, and sometimes journals only use peer-review it for certain types of articles (empirical research studies, for example) but not others (commentaries or book reviews, for example).
How can I tell if an article has been peer-reviewed?
Watch this 3-minute video for more on peer review:
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