Reviewing
Reviewing Outside Your Exact Area
Editors ask people who are close but not exact, deliberately. What you can assess, what you must flag, and when to decline instead.
Almost every review request is slightly outside your exact area. Editors do this deliberately: a reviewer who works on precisely the same question is frequently a competitor, and a reviewer from an adjacent area brings a perspective the specialists share too readily.
The problem is not being asked. It is reviewing as though you were the specialist, or declining when you had something useful to say. For a concrete operational example of how a workplace tool approaches a related coordination problem, see this resource.
What you can assess without being a specialist
More than people assume.
Whether the question is clearly stated. If you cannot tell what the paper is trying to find out, that is a finding regardless of your expertise.
Whether the claims match the evidence shown. Overclaiming is visible from outside, and it is one of the most useful things a review catches.
Whether the logic holds. Does the conclusion follow from the result, are alternatives addressed, is the interpretation consistent with what is reported.
Whether it is readable by someone in the broader field. For a general journal this is central, and you are exactly the right reader for it.
Whether the reporting is complete enough to evaluate. Sample, procedure, exclusions, what was done.
Whether the contribution is stated in a way that lets a reader judge its size.
What you cannot assess, and must say so
Technical correctness of a method you do not use. Do not guess. An incorrect confident statement about a method is worse than silence, and the specialist reviewer will contradict you.
Whether the literature is complete in a subfield you do not follow.
Whether the data source is appropriate, if it is one you have not used.
Whether the result is novel in a literature you do not track.
Say where your expertise ends
The most important thing you do, and it goes in the confidential comments to the editor.
"I work on X and can assess the design and the interpretation. I am not able to evaluate the estimation procedure in Section 4 and would suggest a reviewer who uses it."
This is not an admission of inadequacy. It is precisely what the editor needs in order to weight your report and to decide whether another reviewer is required.
Editors consistently say they want this and rarely get it, because reviewers feel that admitting a limit undermines their report. It does the opposite.
Also flag your confidence in the report itself, if the journal has a field for it. A low-confidence report is still useful.
When to decline
When you cannot assess any of the central claims. If the paper's contribution rests entirely on a method you cannot evaluate, you are not a useful reviewer.
When you would need to learn the area to review it. Reviewing is not the occasion for that.
When you have a conflict — recent co-author, close collaborator, direct competitor on the same question, or the paper is by your own student. Say why; the editor needs the reason.
Decline promptly, so the editor can find someone else. See declining academic requests.
And decline if you cannot give it proper time, which is a different reason and equally legitimate.
Reviewing across disciplines
A harder version, increasingly common as work becomes interdisciplinary.
Norms differ and you may be applying yours unconsciously. Sample sizes, what counts as adequate evidence, whether preregistration is expected, how theory is used, what a literature review is for — all vary substantially between fields.
Ask whether your objection is a standards objection or a norms objection. "This sample is too small" may be true in your field and standard in theirs. If you are not sure, say so rather than asserting it.
Do not require the paper to be written in your field's style. Structure, terminology and citation practice differ, and demanding conversion is not review.
Do flag genuine incomprehensibility, which is different. If a reader from an adjacent field cannot follow it, and the journal serves both, that is a real problem.
Writing the report from outside
Frame your comments as what a reader like you experienced. "As someone from an adjacent field, I could not follow the argument at Section 3" is precise and useful, and it does not overclaim.
Prioritise as usual — what would change the conclusion, what would strengthen the paper, what is presentational. See how to review a paper.
Be more tentative on the technical points and no less clear on the logical ones. Your confidence should track your competence, visibly.
Recommend accordingly. If you cannot assess the central method, your recommendation carries less weight and you should say so rather than issuing a confident reject.
Why it is worth doing
The outside reader catches things the specialists miss. People inside a literature share assumptions, and a reviewer who does not share them notices when an assumption is load-bearing and unstated.
Overclaiming is most visible from outside, because the specialists read the claim in the context of what everyone in the subfield already believes.
And readability for the broader audience is something only a broader reader can assess, which is precisely why editors ask.
The short version
You can assess clarity, logic, whether claims match evidence, and completeness of reporting — none of which requires being the specialist.
Say where your expertise ends, in the note to the editor. Editors want this and rarely receive it.
Decline when the central claim rests on something you cannot evaluate, and decline promptly.
Across disciplines, check whether your objection is about standards or about norms — and if you are unsure, say so rather than asserting.
For an independent authoritative reference, consult COPE guidance for publication-ethics guidance for editors and reviewers.