The MDPI Editorial Process

MDPI operates a rigorous and transparent peer review process that aims to maximize quality; it is handled by researchers and scholars.

We believe that peer review should be efficient, rigorous, and fair for everyone involved.

For most MDPI journals, peer review is a single-blind assessment with at least two independent reviewers, followed by a final acceptance/rejection decision by the Editor-in-Chief or another academic editor approved by the Editor-in-Chief. The Editor-in-Chief is responsible for the academic quality of the publication process, including acceptance decisions; the approval of external editors and topics for article collections, such as Special Issues, Topics, and Topical Collections; and appointing new Editorial Board members.

A summary of the editorial process is given in the flowchart below.

The MDPI editorial process. 

More about MDPI Editorial Process

The following provides notes on each step.

Pre-check

The pre-screening stage consists of two main steps: a technical pre-check performed by the Editorial Office and an editorial pre-check performed by an academic editor.

Immediately after submission, the journal’s Managing Editor will perform the technical pre-check to assess:

• The overall suitability of the manuscript to the journal/section/Special Issue/Topic/Topical Collection;
• Manuscript adherence to high-quality research and ethical standards;
• Standards of rigor to qualify for further review.

The academic editor (i.e., the Editor-in-Chief in the case of regular submissions, the Guest Editor in the case of Special Issue submissions, the Topic Editor in the case of Topic submissions, the Collection Editor in the case of Topical Collection submissions, and an Editorial Board member in the case of a conflict of interest and regular submissions if the Editor-in-Chief allows) will be notified of the submission and invited to perform an editorial pre-check. During the editorial pre-check phase, the academic editor will assess the suitability of the submission with respect to the scope of the journal, as well as the overall scientific soundness of the manuscript, including the relevance of the references and the correctness of the applied methodology. The academic editors can decide to reject the manuscript, request revisions before peer review, or continue with the peer review process and recommend suitable reviewers.

Guest Editors of Special Issues, Topic Editors of Topics, and Collection Editors of Topical Collections are not able to make decisions regarding their own manuscripts submitted to their Special Issue/Topics/Topical Collection, as this would constitute a conflict of interest. An Editorial Board member will instead be responsible for decision making. The Guest Editor/Topic Editor/Collection Editor will be unable to access the review process except in their role as author. Similarly, Editors-in-Chief or other Editorial Board members are not able to access the review process of their manuscript except in their role as author.

Peer Review

From submission to final decision or publication, one dedicated MDPI staff member coordinates the review process and serves as the main point of contact for authors, academic editors, and reviewers.

The process is single-blind for most journals, meaning that the author does not know the identity of the reviewer, but the reviewer knows the identity of the author. Some MDPI journals operate double-blind peer review, where in addition to the author not knowing the identity of the reviewer, the reviewer is unaware of the author’s identity. Conference journals (https://www.mdpi.com/about/proceedings) operate a different peer review standard. The peer review process is handled by the conference committee, and the review method as well as the number of reports is decided by the conference organizers' requirements.

At least two review reports are collected for each submitted article. The academic editor can suggest reviewers during pre-check. Alternatively, MDPI editorial staff will use qualified Editorial Board members, qualified reviewers from our database, or new reviewers identified by web searches for related articles.

Authors can recommend potential reviewers. MDPI staff ensure that there are no potential conflicts of interest and will not consider those with competing interests. Authors can also enter the names of potential peer reviewers they wish to exclude from consideration in the peer review of their manuscript, during the initial submission of the manuscript. The Editorial Team will respect these requests as long as they do not interfere with the objective and thorough assessment of the submission.

If the journal has a reviewer board, these reviewers could apply to review a submitted manuscript should the authors agree to this option during submission.

The following criteria are applied to all reviewers:

• They should hold no conflicts of interest with any of the authors;
• They should not come from the same institution as the authors;
• They should not have published together with the authors in the last three years;
• They should hold a PhD or be a MD (applicable for medical journals);
• They should have relevant experience and have a proven publication record in the field of the submitted paper (Scopus or ORCID);
• They should hold an official and recognized academic affiliation.

Reviewers who are accepted to review a manuscript are expected to:

• Have the necessary expertise to judge manuscript quality;
• Provide quality review reports and remain responsive throughout peer review;
• Maintain standards of professionalism and ethics.

Reviewers who accept a review invitation are provided 7–10 days to write their review via our online platform, SuSy. Extensions can be granted on request.

When reviewing a revised manuscript, reviewers are asked to provide their report within three days. Extensions can also be granted on request.

To assist academic editors, MDPI staff handle all communication with reviewers, authors, and the external editor. Academic editors can check the status of manuscripts and the identity of reviewers at any time, and are able to discuss manuscript review at any stage with MDPI staff.

Open Peer Review

MDPI journals allow authors to choose "open peer review". Choosing open peer review means that review reports and author responses to reviewers will be published alongside the manuscript. Publishing the reviewer reports and author responses together with the article provides greater transparency and trust for readers as they can track and check the peer review process. The Open Peer Review model also encourages reviewers to provide high quality comments as they will be made public if the article is accepted for publication.

To promote open communication further and increase the robustness of the peer review process, we encourage reviewers to sign their reports so that their name appears on the review report (referred to as open identity). By signing the reports, reviewers receive direct credit for their contribution to the peer review process and also shows their commitment towards open science. The default option is for reviewers to remain anonymous. If an article is rejected no details will be published.

MDPI authors have embraced the Open Peer Review model and we have seen an increase in published reports since the launch of this initiative in 2014. Further information can be found on our blog.

Revision

In cases where only minor or major revisions are recommended, MDPI staff will request that the author revise the paper before referring to the academic editor. Where conflicting review reports are present, or where there are one or more recommendations for rejection, feedback from the academic editor is sought before a decision about revisions is communicated to the authors. Additional reviewers or further review reports may be requested by the academic editors at this stage.

Revised versions of manuscripts may or may not be sent to reviewers, depending on whether the reviewer requested to see the revised version. By default, reviewers who request major revisions or recommend rejection will be sent the revised manuscript. All reviewers can access the most recent version of the manuscript via SuSy.

A maximum of two rounds of major revision per manuscript are normally provided. If more rounds are required according to the reviewers, MDPI staff should request a decision from the academic editor.

If the required revision time is estimated to be longer than 2 months, we recommend that authors withdraw their manuscript before resubmission so as to avoid unnecessary time pressure and to ensure that all manuscripts are sufficiently revised.

For manuscripts that require extensive revisions, where the paper status is “Reject and Encourage Resubmission”, authors may choose to resubmit their manuscript to the same journal in their own time upon completion of comprehensive revisions. Revised manuscripts submitted to the same journal will be assigned a new manuscript ID and linked to the original submission in our submission system (SuSy). Following resubmission, the editorial process will continue as normal (https://www.mdpi.com/editorial_process). To ensure an efficient and effective peer-review process, the same reviewers will be invited to review the resubmitted manuscript.

Editor Decision

Acceptance decisions on manuscripts can be made by the academic editor after peer review once a minimum of two review reports have been received. Acceptance decisions are made by an academic editor (the Editor-in-Chief, a Guest Editor/Topic Editor/Collection Editor, or another suitable Editorial Board member). Guest Editors/Topic Editors/Collection Editors are not able to make decisions on their own papers which will instead be assigned to a suitable Editorial Board member. When making a decision, we expect the academic editor to check the following:

• The suitability of the selected reviewers;
• The adequacy of reviewer comments and author response;
• The overall scientific quality of the paper.

The academic editor can select from the following options: accept in its current form, accept with minor revisions, reject and decline resubmission, reject but encourage resubmission, ask the author for a revision, or ask for an additional reviewer.

The academic editors should alert the Editorial Office to any potential conflicts of interest that may bias, or be perceived to bias, decision making. More details about MDPI's conflicts of interest policy for academic editors can be found at https://www.mdpi.com/ethics#_bookmark22.

Reviewers make recommendations, and the Editors-in-Chief or academic editors are free to disagree with their views. If they do so, they should justify their decision for the benefit of the authors and reviewers.

In some instances, an academic editor supports a decision of manuscript acceptance despite a reviewer recommendation to reject. MDPI staff will seek a second independent opinion (double decision) from an Editorial Board member or the Editor-in-Chief before communicating a final decision to the authors. The double decision, provided by an Editorial Board Member or the Editor-in-Chief, is the final decision.

Articles can only be accepted for publication by an academic editor. Employed MDPI staff then inform the authors. MDPI staff never make paper acceptance decisions.

MDPI staff or Editorial Board members (including Editors-in-Chief) are not involved in the processing of their own academic work. Their submissions are assigned and revised by at least two independent reviewers. Decisions are made by other Editorial Board members who do not have a conflict of interest with the authors.

MDPI is a signatory of the 2012 San Francisco Declaration on Research Assessment (DORA). We aim to publish only manuscripts that are scientifically correct, and we do not artificially increase journal rejection rates, allowing the wider reader community to define the impact.

Author Appeals

Authors may appeal a rejection by sending an e-mail to the Editorial Office of the journal. The appeal must provide a detailed justification, including point-by-point responses to the reviewers' and/or Editor's comments using an appeal form. Appeals can only be submitted following a “reject and decline resubmission” decision and should be submitted within three months from the decision date. Failure to meet these criteria will result in the appeal not being considered further. The Managing Editor will forward the manuscript and related information (including the identities of the referees) to a designated Editorial Board Member. The academic editor being consulted will be asked to provide an advisory recommendation on the manuscript and may recommend acceptance, further peer review, or uphold the original rejection decision. This decision will then be validated by the Editor-in-Chief. A reject decision at this stage is final and cannot be reversed.

Production

MDPI’s in-house teams perform production on all manuscripts, including language editing, copy editing, and conversion to XML. Language editing is carried out by professional English editing staff. In the small number of cases where extensive editing or formatting is required, we offer authors an English editing service for an additional fee (with the authors’ prior approval). The authors are also free to use other English editing services, or consult a native English-speaking colleague—the latter being our preferred option.

Publication Ethics

MDPI is a member of the Committee on Publication Ethics (COPE), including following its Principles of Transparency and Best Practice in Scholarly Publishing. Our journals follow COPE’s procedures for dealing with potentially unethical behavior by authors, reviewers, or editors. All MDPI editorial staff are trained in how to detect and respond to ethical problems.

Details on ethical considerations for submitting papers can be found in the instructions for authors of journals (see here, for example). Please refer to our policy regarding Updating Published Papers.

Ethical issues raised by readers of the journal will be investigated by the editorial office following procedures recommended by COPE. Disputes on the validity of research reported in published papers can be settled by the Editorial Board. For disputes around authorship, data ownership, author misconduct, etc., where necessary, we will refer to external organizations such as a university ethics committee. Authors are asked to respond to any substantiated allegations made against them.

To manage authorship disputes, we follow COPE guidelines, particularly How to spot authorship problems. Typically, if all authors agree, the authorship can be updated via a Correction. If not, we require an authoritative statement from the authors' institution(s) about who qualifies for authorship.

Publishing Standards and Guidelines

MDPI follows the following guidelines and standards for its journals:

ICMJE: Medically-related MDPI journals follow the recommendations of the International Committee of Medical Journal Editors. The guidelines comprehensively cover all aspects of editing, from how the journal is managed to details about peer review and handling complaints. The majority of the recommendations are not specific to medical journals and are followed by all MDPI journals.

The CONSORT statement covers the reporting of randomized, controlled trials. We encourage authors to verify their work against the checklist and flow diagram and upload them with their submission.

TOP covers transparency and openness in the reporting of research. Our journals aim to be at level 1 or 2 for all aspects of TOP. Specific requirements vary between journals and can be requested from the editorial office.

FAIR Principles cover guidelines to improve the Findability, Accessibility, Interoperability and Reuse of data.

PRISMA covers systematic reviews and meta-analyses. Authors are recommended to complete the checklist and flow diagram and include it with their submission.

ARRIVE contains guidelines for reporting in vivo experiments. Authors are recommended to verify their work against the checklist and include it with their submission.

iThenticate is an industry-standard software for plagiarism detection. Used during the first screening of a manuscript or pre-check, it can also be used at any stage of the peer review process and especially before the acceptance of a manuscript for publication.

Compliance with the standards and guidelines above will be taken into account during the final decision and any discrepancies should be clearly explained by the authors. We recommend that authors highlight relevant guidelines in their cover letter.

Editorial Independence

All articles published by MDPI are peer-reviewed and assessed by our independent Editorial Boards, and MDPI staff are not involved in decisions to accept manuscripts. When making a decision, we expect the academic editor to make it based solely upon:

• The suitability of the selected reviewers;
• The adequacy of the reviewer comments and author’s response;
• The overall scientific quality of the paper.

In all of our journals and in every aspect of our operation, MDPI policies are informed by the mission to make science and research findings open and accessible as widely and rapidly as possible.