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“Peer reviewed” means a journal sought advice from subject experts outside its editorial team. It does not mean the article’s findings are guaranteed to be true. To understand what the label tells you, check the journal’s policy and the article’s disclosures: who reviewed the work, whose identities were concealed or revealed, whether reports were published, and how the editor reached a decision.
What is peer review?
COPE, DOAJ, OASPA and WAME define peer review as “obtaining advice on manuscripts from reviewers/experts in the manuscript’s subject area.” Their guidance specifies that reviewers should not be part of the journal’s editorial team. In practice, a journal sends a manuscript to relevant experts, receives their assessments and uses that input as part of its editorial process.
The details depend on the journal, discipline and article type. The organizations’ transparency guidance says journals should explain which content is reviewed, who reviews it, what model is used, whether identities are masked, whether reports are posted or signed, how decisions are made and which article types are exceptions. Check the journal’s current policy and the individual article’s disclosures rather than assuming every article from a journal followed an identical process.
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The label describes a process, not a guarantee or certification of correctness. Review can help editors assess and improve a manuscript, but review alone does not prove that a finding is true, that every error was caught, or that bias was eliminated. The cited guidance describes aims and procedures; it does not establish a universal level of error detection.
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In a 2022 Springer Nature Author Survey, 82% of researchers said peer review improves the quality of their work, as reported by the STM Association. That is a finding about researchers’ reported views—not evidence that review catches every error or guarantees valid results.
How does peer review work?
- Submission and editorial handling: The journal receives a manuscript and determines how it will be handled under its policies. The editor, not the reviewers, makes the editorial decision, drawing on reviewer advice and the journal’s criteria.
- Expert review: The journal seeks advice from reviewers with relevant subject expertise who are outside the editorial team. The model determines what reviewers and authors know about one another.
- Editorial decision and response: The editor communicates a decision and may provide reviewer reports or editorial feedback. Depending on the journal and decision, authors may be invited to respond or revise.
- Possible publication of review materials: Some journals make some or all of the review history available with the article; others do not. Whether reviewers are named is a separate policy detail.
Reviewers are expected to give objective, constructive critique, keep manuscripts confidential, disclose conflicts of interest and accept reviews only when they have appropriate expertise and enough time. These responsibilities shape the process but do not make it infallible.
What are the main peer-review models?
Labels primarily describe identity arrangements, but they do not capture every feature of a journal’s process. The STM/NISO Peer Review Terminology initiative formalized its standard as an ANSI/NISO standard in July 2023. It compares models across four elements: identity transparency, reviewer interactions, information about the process that is published, and post-publication commenting.
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| Model | What the label means | Important qualification |
|---|---|---|
| Single-anonymized | Reviewers know the authors’ identities; authors do not know reviewers’ identities. | STM describes shielding reviewers from possible influence or pressure as one rationale for this design. |
| Double-anonymized | Authors and reviewers are anonymized to each other. | STM describes minimizing bias related to affiliations, gender or geographic origin as an aim, not a demonstrated result. |
| Open peer review | A broad family of practices that may include identity disclosure, published reports or other transparency measures. | The term alone does not promise that every identity or report will be public. |
| Post-publication review | Scrutiny continues after publication through comments, discussion or formal critique. | It can complement review before publication. |
“Open” may refer to different combinations: sharing identities, publishing reports, enabling community comments or discussion, reviewing preprints before publication, allowing post-publication comments, or separating review from publication. Ask what the journal actually makes transparent instead of relying on the label.
What is open peer review?
Open peer review is not one fixed procedure. A journal might reveal reviewer names but keep reports private, publish reports without revealing reviewer identities, or combine several transparency practices. Its policy should spell out which identities are disclosed, what material is published and when, whether reviewers can sign their reports, and whether discussion continues after publication.
Example: PLOS published review history
PLOS defines published peer-review history as correspondence exchanged during review, including decision letters for revisions, editorial feedback, reviewer reports and author responses, made available beside the published article. After acceptance, authors can opt to publish this history. Reviewers who sign have their names displayed with their comments; unsigned reviews remain anonymous.
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PLOS says this material can help readers see the questions raised and how authors responded, and can offer examples to students learning to review. These are PLOS’s stated benefits, not proof of a universal outcome for every open-review system.
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What should you check in a journal’s policy?
- Coverage: Which content is peer reviewed, and which article types are exceptions?
- Reviewer selection: Who reviews the work, and are reviewers external to the editorial team?
- Identity rules: Which participants can see authors’ or reviewers’ identities? Can a reviewer choose to sign?
- Published information: Are reports, decision letters, author responses or other review materials made public?
- Decision authority: How does the editor use reviewer advice and reach a decision?
- Continuing scrutiny: Are comments or formal critiques possible after publication?
- Timing claims: Are review-time estimates supported by published timeframes for accepted papers? COPE’s principles say journals should tell authors about delays and give them the chance to withdraw; a journal should not guarantee acceptance of initial submissions.
COPE’s transparency principles page was last reviewed September 15, 2022 and says it is under review, so consult the journal’s current policy for its own procedures.
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How can you review a paper responsibly?
PLOS’s suggested workflow offers a practical sequence for invited reviewers:
- Accept only if you have the expertise and time to provide an objective review, and understand the journal’s criteria.
- Read once to understand the overall argument, then read again to make detailed notes.
- Examine the research question, methods, conclusions, figures and tables.
- Summarize the work, then explain specific concerns and practical improvements constructively.
Keep the manuscript confidential and disclose relevant conflicts. A review is useful when it is specific, fair and within the reviewer’s competence—not when it overstates what the evidence can support.
Does peer review prove a paper is reliable?
No. Peer review indicates that a journal obtained expert advice under a particular process. It can filter and improve work, but the label alone does not establish that a paper is correct, free of bias or free of errors. Nor does it establish that fraud has been reliably detected.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesThe sources cited here do not establish which model is universally most accurate or fair, or quantify the effects of different models across disciplines. For a particular article, use the journal policy and article disclosures to understand what review occurred, then assess the paper’s methods, evidence and conclusions on their merits.
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