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Other Article Types

Registered Reports

Registered Reports are research articles that undergo peer review at the study design or protocol stage, prior to conducting experiments, data collection or analysis. The Registered Report format aims to support a strong methodological approach, increase the reproducibility of results, and address publication bias. Read more on our blog.

Assessment takes place in two stages and results in two linked publications:

  1. Registered Report Protocol: an article describing the study design, rationale, timeline, proposed methodology for data collection and analysis, and where applicable ethical approval for the work. Registered Report Protocols report the study proposal prior to conducting experiments, data collection or patient recruitment, and they undergo peer review to ensure that the planned research will meet PLOS ONE’s publication criteria. Accepted Registered Report Protocols are published in the journal, and receive an in-principle accept for the future article reporting the results of the study after completion.
  2. Registered Report: a Research Article describing the full study and its findings upon completion, including the methods information originally outlined in the Registered Report Protocol. Peer review focuses on adherence to the protocol and the appropriateness of any deviations. If accepted, the published Research Article and Registered Report Protocol are linked on our website.

PLOS ONE welcomes unsolicited submissions of Registered Report articles. Registered Reports are eligible for facilitated preprint posting and published peer review history at both stages of review.

Formal Comments

Formal Comments are invited by PLOS ONE staff editors to promote scientific discourse about PLOS ONE articles. They provide additional perspectives or context on a publication, especially in areas of policy, societal relevance, or ongoing scientific debate.

PLOS ONE may invite a Formal Comment as:

  • response to scientific criticism or re-analysis by authors whose work is disputed in a PLOS ONE publication.
  • an article that offers an expert, broad and balanced perspective on a PLOS ONE publication, or adds context on the potential editorial, societal or policy implications of the findings.

Formal Comments should be concise, coherent, well-argued and of timely relevance to the field. Formal Comments undergo peer review, and the journal will also invite the authors of the article under discussion to provide a signed review. PLOS ONE staff editors do not consider unsolicited Formal Comments. 

Formal Comments are not meant to address concerns around publication ethics. Direct ethical concerns about PLOS ONE articles to our editorial office at

Collection Reviews

PLOS ONE considers Collection Review articles within pre-planned Collections with the goal to provide deeper insight into one or more of the topics covered in the Collection. These articles are compelling narrative reviews that discuss current developments in a particular field under the Collection’s scope and draw meaningful conclusions adding to knowledge in the field. They should be balanced, coherent, representative of the literature on the topic covered, and clearly positioned in the subject of the Collection.

Collection Reviews will be considered within a pre-planned Collection subject to prior approval by journal editors, or they may be commissioned by staff editors. PLOS ONE staff editors will not consider unsolicited Collection Reviews. Collection Reviews should include:

  • A maximum of 4,000 words
  • An introduction summarizing the background of the topic and the purpose of the review.
  • A conclusion succinctly outline the key points.
  • Any other subheadings needed to reflect the content
  • Where possible, an outline of implications to the field and recommendations based on the evidence presented.
  • Tables, figures and boxes to summarise points or compare approaches, and to help reduce word length.

Collection Overviews

PLOS ONE considers Collection Overview articles within pre-planned Collections. Collection Overviews discuss the relevant history and scientific background of a Collection, and unlike Collection Reviews, they are not intended as an exhaustive summary of a particular topic, but rather aim to place the articles included in the Collection within the context of knowledge in the field.

Collection Overviews should be concise, with suitable referencing, and provide the appropriate context for the publications in the Collection.

Collection Overviews will be considered subject to prior approval by journal editors, or they may be commissioned by staff editors from the Guest Editor(s) of a Collection. PLOS ONE staff editors do not consider unsolicited Collection Overviews.

Topic Pages

Topic Page articles are intended to increase the coverage of scientific topics in Wikipedia. Topic Pages are written in the style of a Wikipedia article and, after open peer review on the PLOS Wiki, become a published copy of record with a dynamic version of the article posted on Wikipedia.

While Academic Editors most often solicit Topic Pages from researchers in their areas of expertise, we also welcome new proposals and inquiries for editorial consideration. Proposals should address topics that are of interest to the scientific community and wider general public and that are not yet covered or are currently under-developed, in Wikipedia.