A study can be impeccably designed and still be impossible to trust, for a simple reason: if the paper does not say what was actually done, no reader can judge whether to believe it, and no one can reproduce it. Under-reporting is one of the quietest threats to reproducibility — not fraud, not bad method, just the omission of the details that would let someone evaluate the work. Reporting guidelines exist to fix this by specifying, item by item, what a paper of a given type must contain. They are a central concern of the reproducibility domain and connect directly to the research-integrity domain, because honest, complete reporting is the precondition for both.
The EQUATOR Network: a library of guidelines
The coordinating body for reporting guidelines is the EQUATOR Network — Enhancing the QUAlity and Transparency Of health Research. EQUATOR does not publish a single guideline; it curates and promotes the whole family of them, maintaining a comprehensive online library of reporting guidelines for different study types and providing resources to help authors, editors, and reviewers use them. Its premise is straightforward: there is no point in conducting rigorous research if the publication that reports it omits the information readers need to assess and use it. EQUATOR’s role is to make the right guideline easy to find and to raise the baseline quality of reporting across health research.
The key thing to understand is that different study designs need different guidelines, because each design has its own ways of being under-reported. A randomised trial can hide how participants were allocated; a systematic review can hide how studies were selected; an animal study can hide how many animals were used and why. A guideline is a checklist tuned to the failure modes of a particular design.
The major guidelines
A handful of guidelines account for most everyday use, and it is worth knowing which applies to what.
- CONSORT (Consolidated Standards of Reporting Trials) is for randomised controlled trials. Its checklist and accompanying flow diagram cover how participants moved through the trial — enrolment, allocation, follow-up, analysis — along with the method of randomisation, blinding, and the pre-specified outcomes. CONSORT is what makes it possible to see whether a trial’s reported result matches the trial it set out to run.
- PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) is for systematic reviews and meta-analyses. Its checklist and flow diagram document the search strategy, the inclusion and exclusion criteria, and how records were screened and selected. PRISMA is what lets a reader judge whether a review’s conclusions rest on a fair and reproducible survey of the evidence rather than a convenient selection.
- ARRIVE (Animal Research: Reporting of In Vivo Experiments) is for research involving animals. It sets out the details — species, number and characteristics of animals, housing, the experimental procedures, the statistical methods — needed both to evaluate the work and to honour the ethical principle that animal studies should be reportable and not needlessly repeated.
- STROBE (Strengthening the Reporting of Observational studies in Epidemiology) is for observational studies — cohort, case-control, and cross-sectional designs — where the reporting challenges differ again from trials.
These are only the most prominent. EQUATOR’s library extends to qualitative research, diagnostic accuracy studies, case reports, economic evaluations, and many more, with specialised extensions for particular contexts. The skill is in matching the guideline to the study.
What a guideline actually is — and is not
It is important to be clear about what reporting guidelines do. A reporting guideline governs how a study is reported, not how it is designed or conducted. CONSORT does not tell you how to run a trial; it tells you what to disclose about the trial you ran. This distinction matters because a guideline cannot rescue a bad study — it can only ensure that a study, good or bad, is described completely enough for readers to tell the difference. Used as a checklist while writing, a guideline prompts authors to include the items that are easy to forget and tempting to omit; used by reviewers and editors, it provides an objective basis for asking “where is the allocation method?” rather than relying on impression.
Reporting guidelines also pair naturally with the wider machinery of trustworthy research. A CONSORT-compliant trial report is far more valuable when the trial was prospectively registered, so that the pre-specified outcomes in the registration can be checked against those in the paper. A PRISMA-compliant review is stronger when its protocol was registered in advance. The guidelines define completeness of reporting; registration defines commitment in advance; together they close much of the gap between what was planned, what was done, and what was published.
Practical guidance for authors
- Identify the right guideline before you write, not after. Match it to your study design — CONSORT for a trial, PRISMA for a review, ARRIVE for animal work, STROBE for an observational study — using the EQUATOR library to find it.
- Use the checklist as you draft, treating each item as a question your paper must answer, and complete the flow diagram where the guideline provides one.
- Submit the completed checklist with the manuscript; many journals now require it, and it signals to editors and reviewers that the reporting is complete.
- Combine the guideline with registration — register trials and review protocols in advance so that the reported outcomes can be checked against the planned ones.
Where shared vocabulary fits
“Reporting guideline”, “checklist”, “flow diagram”, “extension”, and the individual acronyms are used loosely, and confusing a reporting guideline with a study-design standard is a common and consequential error. A shared, federated vocabulary that defines these terms precisely — and points back to the EQUATOR Network and the individual guideline stewards — is what lets a reporting standard cited in one journal be understood the same way in another. Supplying that definitional layer is the role the CASRAI dictionary is designed to play; the relevant terms sit in the reproducibility domain, with adjacent entries in the research-integrity domain.
