What is Peer Review?
Peer review is the evaluation of a piece of research by independent experts in the same field (the author's "peers") before it is published or funded. Reviewers judge whether the methods are sound, the conclusions follow from the evidence, and the work is original and clearly reported. Their reports help the editor decide, and help the authors improve the paper.
What Is a Peer-Reviewed Journal?
A peer-reviewed (or refereed) journal sends submitted research articles to outside experts before accepting them. Most scholarly journals do; a journal's website states its review policy, Ulrichsweb marks refereed journals, and Scopus indexes only peer-reviewed titles (see peer-reviewed database). Not everything in a peer-reviewed journal is reviewed: editorials, letters and book reviews often are not. "Peer-reviewed" is hyphenated before a noun ("a peer-reviewed article").
How Peer Review Works
- The author submits a manuscript (see journal submission).
- The editor screens it for fit and basic quality; many papers are "desk-rejected" here.
- The editor invites usually two or three reviewers, who read it and write reports.
- The editor decides: accept, minor revisions, major revisions, or reject.
- The authors revise and reply point by point (a revision request), often for another round of review.
- The accepted paper is copyedited and published.
Types of Peer Review
- Single-blind: reviewers know who the authors are; authors do not know the reviewers.
- Double-blind (double-anonymous): neither side knows the other's identity.
- Triple-blind: the editor does not know the authors either.
- Open review: identities are known, and reports may be published with the article.
- Post-publication review: comments after publication, on platforms or in letters.
Does Peer Review Get Paid?
Usually not. Most reviewers volunteer as part of academic service, though some journals offer small fees, discounts on publication charges or recognition through services that record reviewing activity.
How to Write a Peer Review
A typical report opens with a short summary of the paper and an overall assessment, then lists major concerns (design, analysis, whether the conclusions follow) and minor ones (clarity, references, figures), each with a specific suggestion. Example of a useful comment: "The effect is reported for the whole sample only; please report it separately for the two age groups, since the hypothesis concerns age." Be specific, fair and polite, and keep the manuscript confidential.
Limits of Peer Review
Peer review catches many problems but not all: reviewers rarely re-run analyses, can be biased, and sometimes disagree. Read published work critically even when it is peer-reviewed. In Papero, Peer review gives an AI reviewer's report with an overall verdict, strengths, weaknesses and questions, useful before you submit, not a replacement for the journal's review.
Use case: AI for research paper writing