Group Authorship

Group authorship (also called consortium authorship or collaborative-group authorship) is the practice of listing a named collaboration, consortium, or working group — rather than, or in addition to, the individual researchers who did the work — on the author byline of a publication. It is a naming convention for the author entity itself, not a description of how a team is organized or credited internally.

What makes something group authorship

ICMJE’s own guidance on authors and contributors states: “Some large multi-author groups designate authorship by a group name, with or without the names of individuals.” That sentence describes two configurations found in practice:

• Group name plus a full list of individual authors. The collaboration name appears alongside every individual contributor’s name on the byline — the group name functions as a citation shorthand, but every individual is still visibly listed.
• Group name as the primary visible byline, with individuals listed separately. The short citation form uses only the group/consortium name; the full roster of individual contributors is published elsewhere in the article — typically an appendix, supplementary file, or dedicated membership list.

What makes either configuration group authorship rather than an ordinary large-author-list paper is that the collaboration or consortium name itself functions as a named author entity: it is what appears in the short citation, and it is what a reader cites. It is not merely a paper written by many people at many institutions — that is an ordinary multi-author, multi-institutional paper (see CASRAI’s guide to managing multi-institutional research collaborations for the agreement and governance mechanics of that kind of project, which is a distinct question from author-byline naming).

ICMJE requirements: the group name doesn’t relax individual accountability

ICMJE is explicit that a group byline does not lower the bar for authorship. Individuals named as authors within a group — whether visible on the byline itself or listed separately — are each still expected to independently satisfy ICMJE’s four authorship criteria: substantial contribution to the work, drafting or critically revising it, final approval of the version published, and agreement to be accountable for the accuracy and integrity of the whole work (see CASRAI’s authorship entry for the full four-criteria test). ICMJE also distinguishes, within a large group, between people who meet all four criteria (authors) and people who contributed to the project but don’t meet them (commonly called collaborators or non-author contributors) — the corresponding author is expected to identify which individuals fall into which category before submission, and journals typically require this distinction to be resolved as part of the group’s own authorship policy rather than left to the journal to adjudicate after the fact.

How PubMed/MEDLINE indexes group authors

Group authorship has a specific downstream effect on bibliographic indexing. Per ICMJE’s guidance (which describes MEDLINE’s actual indexing practice), the byline identifies who is directly responsible for a manuscript, and when that byline includes a group name, MEDLINE lists the individual group members separately — tagging them by their role as either authors or collaborators, based on the information the journal supplies. In practice this means a PubMed record for a group-authored paper typically shows the group name in the short citation and author list, with a separate, fuller list of individual names (sometimes many hundreds of them) attached to the record, distinguishing those credited as authors from those credited as collaborators. This is why searching for an individual researcher’s name can surface a group-authored paper even when that name doesn’t appear in the paper’s short citation form.

Real examples of group/consortium authorship

Large physics collaborations are the clearest illustration of the first configuration. The 2016 discovery paper reporting the first direct detection of gravitational waves was published under the byline “B. P. Abbott et al. (LIGO Scientific Collaboration and Virgo Collaboration)”, with roughly a thousand individually named co-authors listed alongside the two collaboration names in Physical Review Letters. CERN’s 2012 Higgs boson discovery papers followed the same pattern: the ATLAS and CMS experiments each published under bylines naming the collaboration (“ATLAS Collaboration”, “CMS Collaboration”) together with thousands of individually listed co-authors, reflecting each collaboration’s own internal authorship policy for who qualifies.

Large multicenter clinical trials illustrate the second configuration. The UK’s RECOVERY trial, a large platform trial for COVID-19 treatments, published its primary results (for example, the dexamethasone findings in the New England Journal of Medicine) under the byline “The RECOVERY Collaborative Group”, with a small named writing committee credited individually and the full list of site investigators and collaborators published separately as supplementary material — matching the group-name-as-primary-byline pattern MEDLINE indexing is built to handle.

How this differs from an acknowledgment

Group authorship is easy to confuse with crediting a group in an acknowledgments section, but the two are opposites in one important respect. CASRAI’s acknowledgments section entry covers contributors and entities that, by definition, do not meet authorship criteria — they are thanked, not credited as authors. A group name on the byline, by contrast, is being credited as an author (or as a container for individuals who are each independently credited as authors) — it must clear the same ICMJE bar as any named individual author, not a lower one. If a paper’s methods section says “we thank the XYZ Study Group for data collection” and the group name does not appear on the byline itself, that is acknowledgment, not group authorship.

Frequently asked questions

Is group authorship the same as co-authorship?

No. Co-authorship describes any paper with more than one individual author and says nothing about whether a group or consortium name appears on the byline. Group authorship specifically requires a formal collaboration or consortium name to function as (or alongside) the author entity itself; an ordinary paper with, say, six named co-authors and no group name is co-authorship but not group authorship.

Do all individuals within a named group get authorship credit?

Not automatically. ICMJE requires each individual credited as an author within a group — whether named on the byline or in a separate membership list — to independently meet all four authorship criteria. Group membership itself is not sufficient; large collaborations typically run their own internal authorship review process to decide who qualifies as an author versus a collaborator before submission.

Why does a consortium use a group name instead of just listing everyone?

Practical citation length is one driver — a short citation form with hundreds or thousands of names is unusable in reference lists and citation counts. But the group name is also doing indexing and identity work: it gives the collaboration a stable, citable identity across many papers (useful for tracking the collaboration’s output over time), separate from tracking any single contributor’s output.