Peer Review Week is a global event celebrating the essential role that peer review plays in maintaing scientific quality and to share the central message that good peer review is critical to scholarly communications. 


The high scientific standards maintained by IWA Publishing journals owe much to the continuing dedication of the journals' reviewers, who freely give their time and expertise. 

Peer Review week is a great opportunity to thank reviewers and to think about the importance of peer review more generally. 

Please see some advice on how to review a scientific paper below or see our powerpoint presentation.

Reviewing a scientific paper - some guidelines

The aim of the review is to provide authors with constructive feedback from specialists, so that they can make improvements to their work. This is of key importance to ensure the highest possible standard.

Before you start

Make sure that you are familiar with the Instructions for Authors of the Journal. Before you decide to accept or decline the invitation to review, consider this:

Is the paper within your area of expertise? If not, it may be difficult to provide a high quality review.
Do you have any conflict of interest? For example, do any of the authors work at the same organization as you, or do you know any of them personally? If so, let the editor know.
Make sure that you have the time. It is important to meet the deadlines.

Note that the paper sent to you for peer review is a privileged confidential document. This means that you cannot use the information obtained during the peer-review process for your own or any other person or organization’s advantage or to disadvantage or discredit others.

You should also not contact authors directly, this is to protect your anonymity as IWA Publishing does not share your identity with authors. Comments should only be submitted to the journal via the peer review system.

Do not allow your reviews to be influenced by the origins of a manuscript, by the nationality, religious or political beliefs, gender or other characteristics of the authors.

Two types of papers

Most papers are in one of these categories:

Research Papers: these papers are fully documented, interpreted accounts of significant findings of original research.
Review Papers: these are critical and comprehensive reviews that provide new insights or interpretation of a subject through thorough and systematic evaluation of available evidence. Note, that a review paper is more than a literature overview. It must contain an in-depth critical review of the literature. Therefore, such a review paper is expected to have at least one experienced senior researcher among the authors.

General criteria

Your review will help the editor decide whether or not to publish the article:

Does the paper provide insight into an important issue?
Does the paper tell a good story?
Is the paper interesting for an international audience?
Does the insight from the paper stimulate new, important questions?
Is there a high probability that the paper will be read and cited by others?

Your comments in the review

Remember that authors will welcome positive feedback as well as constructive criticism from you.
Your comments for the “Editor only” will NOT be sent to the author.
Comments that will be transmitted to the author(s) do NOT reveal your identity.

Hint: use your own word processor and copy and paste your comments.

Getting started

Start with the following quick checklist before you consider the content in detail:

Is the length of the paper within the limits of the journal?
Is the paper commercial or does it market a particular product or method?
Is the paper structured properly (abstract, keywords, material and methods, discussion, conclusions, references, etc.)

Abstract, introduction and conclusion


Make sure that the abstract is informative, can stand alone and covers the content.
A combination of the problem and the conclusions.
Maximum length according to the Journal instructions.
No figures or citations should be included here.


3-6 keywords. Should be descriptive. The title words should not be repeated here.


It should

state the objective, the problem - the research question to be addressed,
provide a concise background: why the work was done,
quote literature only with direct bearing on the problem - not a textbook,
state a hypothesis – a suggested solution to the problem.


This is the “take-home message” of the paper. Should be short and concise.
Must be possible to derive from the results and discussion.
It is not a summary of the paper.
No references.

Read the abstract, introduction and conclusions

Is there a clear message?
Having read the introduction – can you find out what the contribution of the paper is? Try to formulate the message in your own words. This can be used later in the reviewer summary.
Do the perceptions or hypotheses in the introduction match the conclusions?
You should be able to find this out within half an hour of reading. After this you will probably have a first impression of whether the paper is worth publishing or not. If you are still positive, then continue the review process. If you are negative, you can probably already explain why the paper is not worth publishing.

Detailed review

Materials and methods

Experiments: are the experiments documented adequately? Have information about positive and/or negative controls, and the numbers of replicated experiments and/or samples been provided?
Model derivations: is the process model derived properly? Is it already known?
Results: are they presented so that you can easily see their significance? You may use a comment like: “The paper would be significantly improved with the addition of more details about…”
Are concentrations shown with believable accuracy - or are they shown with too many significant digits?
Data analysis: have statistics been used in an appropriate way? Is the raw data presented in such a way that you can see if the statistical method is adequate? Is the data normally distributed so that standard deviations are motivated? Are outliers discussed?
Figures: Can the figures explain the results? Are the figure captions informative?
Tables: are all the inputs in the tables necessary to understand the message?
You may add comments like “Overall I do not think that this article contains enough robust data to evidence the statement made on page X, lines Y–Z.


Note that the discussion section makes the paper scientific!

Can the author explain and interpret the results? Can you relate the discussion to the hypotheses?
You may write a comment like “This discussion could be enlarged to explain…”
Have the results been critiqued against the literature? Have any similarities and discrepancies with other published data been identified and accounted for?


Can the conclusions be derived from the results and the discussions?

Check the references:

Have the author(s) done their homework with previous contributions?
Compare the introduction with the reference list. Is it clearly indicated what is new in this paper?
Are there both older and newer references?
How many references? There ought to be 20-30 references in most cases.
Are there any references that cannot be read by an English speaking reader? At most 1-2 references can be allowed (where appropriate) but should be queried.
Is the author citing the original contribution or citing from a popular source?
Make sure that the references cited in the text are included in the reference list and vice versa.

Language issues

Many authors do not have English as their mother tongue. The text does not have to be perfect English, but it has to be clear and understandable. You may add some comment like “This paper would benefit from some closer proof reading. It includes numerous linguistic errors (e.g. agreement of verbs) that at times make it difficult to follow. I would suggest that it may be useful to engage a professional English language editor following a restructure of the paper.”
Phrase your feedback appropriately and with due respect.
You do not need to go through the language issues yourself.

Your recommendation

Ensure that your final evaluation corresponds to your answers in the review form questions; especially should you be considering major revision or rejection. 

Your recommendation will almost surely be one of these:

Reject (explain reason in your report)
Accept without revision (remember that this is very unusual! Most papers can be improved in some way)
Revise – either major or minor (explain the revision that is required, and inform the editor if you would accept to review the revised paper)

You will for some journals get informed by the editor about the decision of the paper.  You can also request this from the journal if you do not receive this. Remember: continue to keep details of the manuscript and its review confidential after the review is completed.



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