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Peer review is the evaluation of scholarly work by people with relevant expertise. In journal publishing, reviewers assess a manuscript and advise the editor, who makes the publication decision. Peer review can help identify weaknesses and improve work, but it does not guarantee that a paper is correct or free from bias.
What does “peer reviewed” mean?
A peer-reviewed work has been assessed through a review process involving people with relevant expertise. For a journal article, that usually means reviewers examine the submitted manuscript and provide feedback or a recommendation to an editor. The term describes a process—not a certification that every claim is true.
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The phrase is also used beyond journal articles. The National Institutes of Health describes peer review as expert critique of written scientific work, including articles, grant proposals, and clinical research protocols, as well as review of an investigator’s research program. Scholarly review can also apply to books, conference papers, and funding decisions. Criteria and final decisions depend on the journal, funder, institution, or conference.
How does journal peer review work?
- Submission: Authors send a manuscript to a journal.
- Editorial screening: An editor checks whether the submission fits the journal and meets its initial requirements. Some manuscripts are declined at this stage without being sent to external reviewers.
- Reviewer invitations: The editor invites people with relevant expertise to assess the work.
- Expert assessment: Reviewers may examine the research question, methods, analysis, interpretation, contribution, and ethical concerns. They provide comments and may recommend a decision.
- Editorial decision: The editor weighs the reviews and decides whether to accept, reject, or request changes. Reviewers advise; the editor decides.
- Revision and further review: If changes are requested, authors revise the manuscript. The editor may send it for another review round before deciding.
The assessment can consider technical soundness, significance or originality where relevant, and suitability for the venue. Peer feedback can also help authors improve a manuscript. The precise criteria vary; some publication models distinguish technical soundness from judgments about novelty or expected impact.
What are the different types of peer review?
Review models differ mainly in which identities are disclosed and whether reports become public. Labels and practices are not identical across journals, so check the journal’s stated policy rather than inferring the details from a model name.
| Model | Identity disclosure | Reports and participation | Practical trade-off |
|---|---|---|---|
| Single-blind | Reviewers know the authors’ identities; authors do not know the reviewers’ identities. | Whether reports are published or wider participation is invited depends on the journal’s policy. | Anonymity may protect reviewers, but can reduce accountability. |
| Double-blind | Author and reviewer identities are concealed from one another, subject to practical limits of anonymity. | Whether reports are published or wider participation is invited depends on the journal’s policy. | Concealment is intended to limit identity-based influence, but anonymity may be difficult to maintain in practice. |
| Open review | Identities are disclosed. | Some versions publish reports or invite wider participation; these features are not universal. | Disclosure can increase transparency and accountability, while reviewers may feel less able to offer candid criticism. |
How long does peer review take?
A 2024 instructional overview in The Peer Review Process reports a typical interval of 4–8 weeks or more from submission to an editorial decision. This is a source-specific estimate, not a universal deadline. Timing can vary with reviewer availability, late reports, editorial workload, and whether authors follow submission instructions.
Does peer review mean a study is reliable?
No. Peer-reviewed status means a work underwent a specified evaluation process; it does not establish that every error was found, that the findings have been independently replicated, or that the conclusions are certain. Reviewers work within limits of time, expertise, information, and the journal’s procedures. Bias and delay are also recognized criticisms of the process.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →To assess a finding, read beyond the peer-reviewed label. Consider the methods and evidence, conflicts of interest, stated limitations, later corrections, and whether other research supports the result. Peer review is one useful part of scholarly quality control, not a substitute for evaluating the evidence.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does peer review ask reviewers to do?
Reviewers are asked to provide expert scrutiny of work within the scope of the review. The questions and standards depend on the organization and purpose: a journal may assess a manuscript’s suitability, while a funder or institution may apply different criteria to a proposal or research program.
Review work may involve confidential material. NIH guidance says reviewers should not copy, retain, or use review material unless permission is specifically granted by the journal or reviewing organization and the author.
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