CASRAI Dictionary

Tag: contributorship statement

  • Author Contributions List vs Author Order: Why Byline Sequence Still Rules

    An author contributions list is a standardised, role-by-role record of who did what on a research output — separate from, and not a substitute for, the traditional first/last byline order. Under the CRediT taxonomy, each named author is mapped to specific roles such as conceptualisation, data curation, or writing; author order still signals seniority and primary effort, and most tenure and grant committees continue to weigh both signals together, not one in place of the other.

    CRediT (Contributor Roles Taxonomy) is a controlled vocabulary of 14 roles used to describe individual contributions to a published research output. CASRAI originated the CRediT contributor role taxonomy in 2014. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022.

    What is an author contributions list, and how is it different from author order?

    An author contributions list — often published as a CRediT statement — assigns each named author to one or more of the taxonomy’s 14 defined roles: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, and Writing – review & editing.

    Author order is a separate, older convention. In most life-science and biomedical fields, the first-listed author is understood to have done the largest share of the practical work, and the last-listed author is understood to be the senior investigator who supervised and secured funding for the project. Economics, mathematics, and high-energy physics frequently use alphabetical order instead, which removes any positional signal entirely. CRediT was built to sit alongside this convention, not to override it — publishers display the traditional byline first and the role breakdown as a separate statement beneath it.

    Why hasn’t CRediT replaced the first/last author convention?

    Author order persists because it is deeply embedded in evaluation infrastructure that CRediT statements were never designed to feed. Citation indices, ORCID records, institutional CV templates, and most national research-assessment exercises still key on byline position, not on role tags.

    The International Committee of Medical Journal Editors (ICMJE) authorship criteria — substantial contribution to conception or design or data work, drafting or critical revision, final approval, and accountability — define who qualifies as an author at all, but say nothing about ranking. That ranking judgement has always been left to the author group itself, and CRediT statements do not resolve the underlying negotiation over who goes first.

    • Major publishers, including Elsevier, Wiley, Taylor & Francis, and PLOS, require a CRediT statement alongside — never instead of — the conventional byline.
    • Grant and tenure dossiers are typically structured around a candidate’s position in the author list, particularly first- and corresponding-author counts.
    • Disciplinary norms vary sharply: alphabetical fields treat CRediT as the primary signal of individual effort, while hierarchical fields still read order first and roles second.

    How do tenure and grant committees weigh CRediT against byline position?

    Most committees have not formally replaced order-based heuristics with role-based ones; they have added CRediT as supplementary evidence a candidate can cite in a narrative statement. A researcher who was, say, third author but listed as sole Formal analysis and Software contributor can now point to the CRediT statement to argue their intellectual contribution exceeds what their position implies — but the committee still has to choose to credit that argument.

    In the UK, this tension has a concrete institutional analogue. Research Excellence Framework (REF) guidance requires submitting institutions to be able to confirm that a researcher made a demonstrable, material contribution to a multi-authored output, independent of where their name sits in the byline — a requirement that pushes panels toward exactly the kind of granular evidence CRediT statements provide, even though REF itself does not mandate CRediT as the format for that evidence.

    UKRI-funded grant applications similarly ask for a description of each investigator’s role on a proposal, distinct from the applicant order on the cover sheet. The direction of travel across UK funders and assessment exercises is toward role-based justification; the direction of travel in journal bylines is not.

    CRediT roles vs traditional byline signals: a comparison

    The two systems answer different questions, which is precisely why neither has displaced the other.

    Signal What it communicates Who controls it Used by
    Author order (first/last) Perceived seniority and volume of effort Negotiated by the author group Citation indices, most CVs, hiring committees
    CRediT contributions list Specific, named role(s) performed Standardised taxonomy, self-declared per role Journal metadata, some REF/grant narratives
    Corresponding author Point of contact and accountability Chosen by the author group Editorial correspondence, some funder reporting
    ICMJE authorship criteria Threshold for qualifying as an author at all Journal editorial policy Gatekeeping, not ranking

    Answer-first Q&A

    What are examples of author contributions?

    Typical author contributions include conceptualisation of the study, data curation, formal analysis, funding acquisition, investigation, methodology design, software development, supervision, and drafting or reviewing the manuscript — the fourteen categories defined in the CRediT taxonomy.

    What are the 14 CRediT contributor roles?

    The fourteen CRediT roles are Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, and Writing – review & editing, standardised under ANSI/NISO Z39.104-2022.

    How do you write an author contribution statement?

    List each named author against the specific CRediT roles they performed, using the taxonomy’s standard labels rather than free text. Most journals require this alongside — not instead of — the conventional byline order, so both signals appear in the published record.

    What should substantial contributions include to be credited as an author?

    Under ICMJE criteria, authorship requires a substantial contribution to conception or design, or to data acquisition, analysis or interpretation, plus drafting or critically revising the work, final approval of the version published, and accountability for the work’s accuracy.

    Implications for institutions and researchers

    For research administrators, the practical consequence is that CRediT statements and author order need to be captured and stored as two distinct data fields, not merged into one. A CV template, grant-reporting system, or tenure dossier that only records byline position discards information a candidate may need to make their strongest case.

    For early-career and non-first-author researchers, the CRediT statement is currently the only standardised place in the published record to document intellectual contribution independent of list position. Institutions that instruct candidates to cite specific CRediT roles in narrative CVs — rather than relying on committee members to infer contribution from order alone — give those researchers a materially better shot at accurate credit.

    Journals and infrastructure providers, meanwhile, have an open task: CRediT statements are still rarely exposed as structured, machine-readable metadata at scale, which limits their usefulness to expert-discovery tools, ORCID auto-population, and bibliometric analysis. Until that pipeline matures, CRediT’s evidentiary value depends on a human reader actually opening the statement and reading it.

    Outlook: convergence, not replacement

    Author order will not disappear from academic publishing; it is too load-bearing across citation practice, hiring convention, and disciplinary identity to be swapped out by a taxonomy, however well designed. What is changing is the burden of proof. Committees that once accepted byline position as a sufficient proxy for contribution are increasingly expected — by funders, by REF-style assessment exercises, and by researchers themselves — to consult the CRediT statement when order and role diverge.

    The realistic trajectory is convergence rather than replacement: author order continues to signal seniority and narrative authorship, while the author contributions list becomes the evidentiary layer committees consult when that signal is contested. Institutions that build review processes around both, rather than defaulting to order alone, will make fairer calls on credit than either system can deliver on its own.

  • Guest Authorship: Why CRediT Alone Fails

    Guest authorship occurs when a research paper’s byline, or its CRediT contributor statement, names someone who did not perform the work described. Because CRediT statements are self-reported by the corresponding author with no independent check, they can record a false contribution as easily as a true one — the taxonomy documents intent, not proof.

    Guest authorship is the practice of crediting an individual — typically an influential or senior figure — as an author or contributor on a study they did not substantively perform, in order to lend the paper credibility or satisfy a hierarchy. It sits alongside gift authorship (crediting a colleague as a favour) and ghost authorship (omitting someone who did the work), and all three predate CRediT by decades. The open question is whether a standardised contributor-role taxonomy actually closes the loophole, or simply gives guest authorship a more official-looking form to hide behind.

    What counts as guest authorship?

    The International Committee of Medical Journal Editors (ICMJE) sets four cumulative criteria for authorship: substantial contribution to the work’s conception or data; drafting or critical revision; final approval of the version published; and agreement to be accountable for it. A guest author fails at least the first criterion — and often all four — yet appears on the byline regardless.

    The Committee on Publication Ethics (COPE) defines a guest author as someone “added, with or without their knowledge, to make the author list look more impressive despite having no involvement with the research.” COPE’s authorship flowchart, last updated in 2024, groups guest authorship with gift and coercive authorship as related but distinct forms of the same underlying problem: a byline that does not reflect who actually did the work.

    Guest, gift and ghost authorship compared

    These terms are frequently used interchangeably, but the mechanism and the harm differ in each case.

    Practice What happens Typical driver CRediT interaction
    Guest authorship An influential outsider is named as author for prestige, with no involvement in the study Boosting perceived credibility or acceptance odds Roles are invented and attached retroactively to justify the byline
    Gift authorship A colleague, mentor or junior researcher is credited as a favour or reward Reciprocity, career support, maintaining relationships Minor or symbolic roles (e.g. “supervision”) are assigned regardless of actual input
    Coercive authorship A senior figure insists on inclusion because they run the lab or hold the funding Power imbalance between principal investigator and juniors The senior author dictates their own — and sometimes others’ — declared roles
    Ghost authorship Someone who did substantial work (often a medical writer) is omitted entirely Commercial sponsors wanting distance from the publication The omitted contributor’s real role never appears in the statement at all

    Why self-declared CRediT statements don’t stop it

    CASRAI originated the CRediT contributor role taxonomy in 2014; the standard is now stewarded by NISO as ANSI/NISO Z39.104-2022. It gives editors and readers 14 defined roles — from Conceptualization to Writing – Original Draft — in place of an undifferentiated author list. That is a genuine improvement in transparency. It is not, on its own, a verification system.

    Three structural gaps explain why:

    • No independent attestation. The corresponding author typically submits the entire CRediT statement on behalf of every co-author. Most journal workflows do not require each named contributor to individually confirm their assigned roles before publication.
    • No cross-check against evidence. A “Formal analysis” or “Investigation” tag is accepted as declared; journals do not routinely request lab notebooks, data-access logs or version-control history to substantiate it.
    • Power dynamics survive the paperwork. A principal investigator who insists on inclusion can equally insist on which role is recorded against their name. The taxonomy formalises the description of a contribution; it cannot compel the description to be honest.

    The scale of the underlying problem predates CRediT and has persisted through its adoption. A 2011 BMJ cross-sectional survey by Wislar and colleagues, examining high-impact medical journals that already required contributorship disclosure, found honorary authorship in 21% of sampled research articles — direct evidence that a disclosure requirement, by itself, does not eliminate the practice it is meant to surface. Ghostwriting scandals tell the same story from the other direction: the withdrawal of the diet drug dexfenfluramine (Redux) from the US market in 1997, after reports linking it to cardiac valve injury, followed years in which academic names had been attached to industry-drafted manuscripts on the drug’s safety — a pattern documented in subsequent publication-ethics literature on pharmaceutical ghostwriting.

    What would actually close the gap

    Closing the gap requires moving verification outside the self-reporting author group. Several mechanisms already exist in partial form and could be combined into a working check.

    • ORCID-linked contributor confirmation. ORCID iDs already let researchers verify affiliations and works against institutional records. Requiring each co-author to confirm their own CRediT roles via their ORCID account — rather than accepting a single submission from the corresponding author — would close the “submitted on your behalf” loophole.
    • Editor-level plausibility checks. COPE’s flowchart already lists warning signs — implausibly long author lists, late additions, unresponsive co-authors — that editorial staff can screen for before acceptance, without new infrastructure.
    • Publisher-side integrity screening. Cross-publisher initiatives such as the STM Integrity Hub, run by the International Association of STM Publishers, pool signals across journals to flag manuscripts and author patterns associated with paper mills and authorship manipulation, extending scrutiny beyond what any single journal can see alone.
    • Institutional sign-off at submission. Some research offices now require every named author to countersign the submitted contributor statement before a manuscript leaves the institution — shifting the accountability point upstream of the journal entirely.

    None of these is sufficient alone. Combined, they replace a single self-declared statement with several independent points where a false claim can be caught before publication rather than after retraction.

    Answer-first Q&A

    What is a guest authorship?

    Guest authorship is when an individual is named as an author or contributor on a research paper despite having made no substantive intellectual or practical contribution to the study. The name is typically added to lend prestige, improve perceived credibility with reviewers, or satisfy an informal hierarchy inside a research group.

    What is honorary guest authorship?

    Honorary guest authorship describes the same practice as gift authorship: crediting a senior or well-known researcher — often a department head or supervisor — who provided general oversight or facilities but did not meet formal authorship criteria such as those set by the ICMJE. It is one of the most commonly reported forms of authorship misconduct.

    What are the four problematic types of authorship?

    Publication-ethics literature groups authorship misconduct into guest, gift, coercive and ghost authorship. Guest and gift authorship credit someone who did not contribute; coercive authorship results from a power imbalance forcing inclusion; ghost authorship is the reverse — omitting a genuine contributor, often a paid medical writer, from the byline entirely.

    What does authorship mean?

    Under ICMJE criteria, authorship requires substantial contribution to a work’s conception or data, drafting or critical revision of the manuscript, final approval of the published version, and accountability for the work’s accuracy and integrity. All four conditions must be met; meeting only one does not qualify a contributor for the byline.

    Implications for editors, institutions and funders

    For editors, the practical implication is that a CRediT statement should be treated as a starting point for scrutiny, not a closing one. Plausibility checks already recommended by COPE cost nothing to implement and catch the crudest cases — implausible author counts, contributions that don’t match a co-author’s known expertise, late-stage additions to the byline.

    For institutions and funders, the implication is upstream: research integrity offices and grant terms can require ORCID-verified, individually confirmed contributor statements as a condition of institutional co-authorship or funding acknowledgement, rather than leaving verification entirely to journals with limited capacity to investigate.

    For developers building submission systems, the opportunity is to make individual confirmation the default workflow rather than an opt-in extra — turning a document that records one person’s account into one every named party must attest to.

    CRediT made contributorship visible. Making it verifiable is the unfinished half of the same reform, and it will require identity infrastructure and editorial process — not a taxonomy update — to complete.

  • Contributorship Statement: What BMJ, ICMJE and CRediT Require

    A contributorship statement is a published account of exactly who did what on a research output, while an ICMJE authorship statement decides who qualifies as an author, and a CRediT statement is the standardised 14-role vocabulary used to write that contributorship account. Editorial staff handling submissions across journal families often have to reconcile all three in the same manuscript. This piece sets out what each one actually requires, where they overlap, and where the gaps sit.

    Contributorship is the practice of recording the specific role each named person played in a research output, distinct from the binary question of who is listed as an author.

    What is a contributorship statement?

    A contributorship statement is the section of a published paper — usually at the end, separate from the byline — that describes who contributed what to the planning, conduct and reporting of the work. It can include people who are not listed as authors, such as patients, technicians or methodologists.

    The model dates to 1997, when BMJ published the editorial “Authorship is dying; long live contributorship” (BMJ 1997;315:696), arguing that the traditional byline concealed who had actually done the work. BMJ formalised the idea further in “Maintaining the integrity of the scientific record” (BMJ 2001;323:588), which introduced its guarantor requirement.

    Contributorship statements are typically free text. That freedom is also their weakness: two journals’ statements for the same paper can describe the same work in incompatible language, which is precisely the reconciliation problem this article addresses.

    How does BMJ’s contributorship model differ from ICMJE authorship criteria?

    BMJ’s contributorship model and the ICMJE authorship criteria answer different questions. ICMJE decides who is entitled to be called an author; BMJ’s contributorship statement records what every listed contributor — author or not — actually did.

    Under the ICMJE Recommendations, a person must meet all four of the following to be named an author:

    • Substantial contribution to the conception, design, acquisition, analysis or interpretation of the work
    • Drafting the work or revising it critically for important intellectual content
    • Final approval of the version to be published
    • Agreement to be accountable for all aspects of the work

    Contributors who meet fewer than all four criteria are acknowledged, not authored — the ICMJE lists funding acquisition, general supervision and language editing as examples of contributions that alone do not justify authorship. The ICMJE’s current Recommendations also require authors to disclose any use of AI-assisted technologies, and state explicitly that a chatbot cannot be listed as an author because it cannot be accountable for the work.

    BMJ layers an extra requirement on top of ICMJE: every paper must name one contributor as guarantor, the person who takes full responsibility for the work, had access to the underlying data and controlled the decision to publish. Neither the ICMJE criteria nor the CRediT taxonomy include a guarantor role — it is a BMJ-specific addition that editorial staff must track separately.

    Where does a CRediT statement fit in?

    A CRediT statement is a contributorship statement written in a controlled vocabulary rather than free text. The Contributor Roles Taxonomy (CRediT) defines 14 fixed roles — Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, and the two Writing roles — that can be assigned to any named contributor, optionally qualified as lead, equal or supporting.

    CASRAI originated the CRediT contributor role taxonomy in a 2014 Nature paper. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022. Because the roles are fixed and machine-readable, CRediT statements can flow through Crossref metadata into ORCID records, unlike a BMJ-style free-text contributorship paragraph.

    CRediT does not resolve who counts as an author — a journal using CRediT still applies ICMJE criteria (or its own equivalent) to decide the byline, then uses the 14 roles to describe what each author did. It also has no guarantor field, so a BMJ paper reformatted for a CRediT-only journal loses that designation unless it is preserved separately.

    Comparison table: BMJ, ICMJE and CRediT requirements side by side

    The table below is designed for editorial staff reconciling a manuscript that must satisfy more than one of these systems at once.

    Requirement BMJ contributorship ICMJE authorship CRediT statement
    Core question Who did what, including non-authors Who qualifies as an author Which of 14 fixed roles did each author hold
    Vocabulary Free text Four qualifying criteria, not roles Controlled taxonomy (14 roles)
    Guarantor required Yes — one named contributor No formal guarantor concept No guarantor field
    Covers non-authors Yes, including patients/public No — separate acknowledgment section Occasionally, if the journal allows it
    Machine-readable No No Yes — flows to Crossref/ORCID
    Governing source BMJ editorial policy ICMJE Recommendations ANSI/NISO Z39.104-2022

    How should editorial staff reconcile competing submission requirements?

    Most friction arises when a manuscript, its co-authors or its data move between journals with different systems — a common case in multi-author biomedical research submitted first to a BMJ title and later revised for a CRediT-only publisher.

    1. Capture ICMJE authorship qualification first — it is the narrowest gate and determines the byline regardless of which contributorship format the journal uses.
    2. Map each qualifying author’s ICMJE-based contribution to the nearest CRediT role or roles; several authors can share a role, and one author can hold several.
    3. Preserve the guarantor designation as a separate field, since it will not survive translation into a CRediT-only statement unless editorial staff carry it across manually.
    4. Retain non-author contributors (data managers, patient contributors, medical writers) in an acknowledgment section even where the target journal’s CRediT statement has no slot for them.
    5. Record any AI-assisted technology use in the acknowledgment or methods section per the ICMJE’s current disclosure requirement, independent of which contributorship format is used.

    Treating ICMJE criteria as the authorship gate, CRediT as the role vocabulary, and BMJ’s guarantor rule as an additional named responsibility — rather than trying to force one statement to do all three jobs — is the fastest way to avoid rejected or returned submissions.

    Answer-first Q&A

    What is a contributorship statement example?

    A typical example reads: “A.S.: Conceptualization, Methodology, Writing — original draft; B.D.: Data curation, Formal analysis; C.E.: guarantor, Supervision.” BMJ-style statements use fuller sentences naming who designed the study, collected data, drafted the manuscript and served as guarantor.

    How do you write an author contribution statement?

    List every named contributor, then state their specific role using either free text or the CRediT taxonomy’s 14 fixed terms. Confirm each listed author independently meets the ICMJE‘s four authorship criteria before drafting, and name one contributor as guarantor if the target journal requires it.

    Is contributorship the same as authorship?

    No. Authorship is a formal status decided by criteria such as the ICMJE’s four-point test and carries accountability for the work. Contributorship separately records what each person, author or not, actually did — the two statements answer different questions and are usually published side by side.

    What this means going forward

    As more publishers adopt CRediT alongside their existing editorial policies, the practical burden shifts from writing contributorship statements to reconciling them across formats. Editorial teams that treat ICMJE, BMJ’s guarantor rule and CRediT as three distinct, layerable requirements — rather than one form to fill in — will spend less time returning manuscripts for correction and more time verifying that credit is accurately assigned.

  • ICMJE Authorship Criteria vs CRediT Roles: What the Four-Point Test Still Leaves Out

    The ICMJE authorship criteria are four cumulative conditions — substantial contribution, drafting or critical revision, final approval, and accountability — that a journal-listed author must meet in full. They decide who qualifies for the byline, but they say nothing about what each named author actually did, which is why a growing number of journals now pair the ICMJE test with a granular CRediT contributor-role declaration.

    The ICMJE authorship criteria are the International Committee of Medical Journal Editors’ four-part definition of authorship, first published in the ICMJE Recommendations and now the de facto global standard referenced by COPE, most biomedical journals, and many university research-integrity offices.

    What are the four ICMJE authorship criteria?

    The ICMJE recommends that authorship rest on four criteria, all of which must be met — not a majority. An individual must have made substantial contributions to conception, design, or data work; drafted or critically revised the manuscript; given final approval of the published version; and agreed to be accountable for its accuracy and integrity.

    • Criterion 1 — Substantial contribution: conception or design of the work, or acquisition, analysis, or interpretation of data.
    • Criterion 2 — Drafting or critical revision: writing the manuscript or reviewing it critically for important intellectual content.
    • Criterion 3 — Final approval: sign-off on the exact version submitted for publication.
    • Criterion 4 — Accountability: agreement to answer for the accuracy and integrity of any part of the work, including parts done by co-authors.

    The ICMJE is explicit that these criteria are not a filter for excluding deserving colleagues: anyone who meets criterion 1 must get the opportunity to participate in drafting, review, and approval, so they can also satisfy criteria 2–4. Funding acquisition, general supervision, and technical or language editing — on their own — do not qualify a contributor for authorship; those belong in the acknowledgements, not the byline.

    A newer addition addresses generative AI directly: under the current ICMJE Recommendations, journals must require disclosure of AI-assisted technology use, and chatbots such as ChatGPT cannot be listed as authors, because they cannot be held accountable for accuracy and integrity under criterion 4.

    Why does meeting the criteria still produce authorship disputes?

    The four-point test is qualitative, self-reported, and adjudicated by the author group itself — the ICMJE states explicitly that it is “the collective responsibility of the authors, not the journal” to determine who qualifies, and that editors should not arbitrate authorship conflicts. That design leaves real gaps in practice.

    • The biostatistician who never drafts. A statistician runs the primary analysis (clearly criterion 1) but is not invited to write or revise the manuscript, so criterion 2 is never offered to them — despite the ICMJE’s own instruction that anyone meeting criterion 1 should get that opportunity. This is one of the most common authorship grievances reported to COPE.
    • Guest and honorary authorship. A senior figure who supervised the lab, but did not contribute intellectually to conception, analysis, drafting, or revision, is added to the byline for prestige or funding-renewal reasons. COPE’s authorship guidance identifies two minimum requirements across authorship definitions — a substantial contribution and accountability — and honorary authors typically fail both.
    • Ghost authorship. A medical writer or industry statistician does the drafting and analysis but is left off the byline entirely, often in industry-funded clinical trials, obscuring who is actually accountable for the reported results.
    • Large multi-author consortia. When hundreds of contributors work on a single dataset or trial, the ICMJE recommends the group decide authorship before the work starts — but retrospectively verifying that every named individual met all four criteria, including final approval, becomes practically unenforceable at scale.

    In each case, the pass/fail structure of the ICMJE test cannot show a reader, an editor, or a research-integrity investigator which specific task a disputed author did or didn’t do. That is the exact gap CRediT was built to close.

    How do CRediT contributor roles add the missing granularity?

    CASRAI originated the CRediT contributor role taxonomy in 2014 as a structured vocabulary of contribution types. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, and it defines 14 discrete roles — Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, and Writing – review & editing.

    Where the ICMJE test asks a single binary question — author or not — CRediT asks a descriptive one: which of these 14 tasks did this named contributor actually perform, and can more than one person share a role. Journals across Elsevier, Cell Press, PLOS, and Frontiers now request a CRediT statement alongside (not instead of) an ICMJE-compliant author list, and several also publish CRediT contributions for non-author acknowledged contributors.

    Dimension ICMJE authorship criteria CRediT contributor roles
    Function Threshold test: qualifies for the byline or not Descriptive vocabulary: records specific tasks performed
    Structure 4 cumulative, all-or-nothing criteria 14 non-exclusive, combinable roles
    Who it covers Named authors only Authors and non-author contributors alike
    Steward International Committee of Medical Journal Editors NISO (ANSI/NISO Z39.104-2022), originated by CASRAI
    Resolves guest/ghost authorship? In theory, no — self-adjudicated and unverifiable at the criteria level Makes the mismatch visible: a “Writing” credit with no “Investigation” or “Formal analysis” role is a red flag

    The complementary use matters most in the disputed scenarios above. A CRediT statement that lists a senior author under Supervision only — with no Conceptualization, Investigation, Formal analysis, or Writing role — gives an editor or institutional investigator concrete evidence to test against the ICMJE’s four criteria, something a bare byline never could.

    Answer-first: common authorship questions

    What are the criteria for authorship in the ICMJE?

    The ICMJE requires all four criteria to be met: substantial contribution to conception, design, or data work; drafting or critical revision of the manuscript; final approval of the published version; and accountability for the work’s accuracy and integrity. Meeting only some criteria means acknowledgement, not authorship.

    What are the five criteria for authorship?

    Some sources describe “five criteria” by splitting the ICMJE’s fourth criterion — accountability — into two parts: taking responsibility for the work and confirming its integrity. The ICMJE’s own text remains four official criteria; the five-part version is a restatement, not a competing standard.

    What are the minimum requirements for authorship?

    COPE identifies two minimum requirements common to authorship definitions across disciplines: making a substantial contribution to the work, and being accountable for the work and its published form. These map directly onto ICMJE criteria 1 and 4.

    What are the guidelines for authorship?

    Authorship guidelines set who can be named on a publication and what they must do to earn that status. The dominant biomedical framework is the ICMJE’s four-criteria test, supplemented in practice by CRediT contributor-role statements and journal-specific policies aligned with COPE guidance.

    What this means for journals, institutions, and researchers

    For editors, ICMJE and CRediT serve different stages of one workflow: ICMJE decides the byline, CRediT documents the record. Requiring both at submission gives research-integrity offices a verifiable trail when a dispute later reaches them, since the ICMJE explicitly directs unresolved conflicts to the researchers’ institution, not the journal.

    For research administrators, a documented CRediT statement is often the fastest way to evidence individual contribution for funder and promotion-committee requirements, independent of authorship order.

    For early-career researchers and biostatisticians, raising criterion-2 access early — asking to review and comment on a draft — is the practical way to convert a CRediT-documented “Formal analysis” role into full ICMJE-qualifying authorship before submission, not after a dispute arises.

    Where authorship attribution is heading

    Neither framework is static. The ICMJE continues to revise its recommendations — most recently to address AI-assisted technology disclosure — and CRediT’s stewardship under NISO opens a formal maintenance path for role definitions as research practice evolves. The direction of travel is layering, not replacement: a qualitative gate for who is accountable, and a structured record of who did what.

    Journals, funders, and institutions that adopt both the CRediT taxonomy and ICMJE-aligned authorship policies give readers, editors, and integrity investigators the clearest possible picture of a paper’s provenance — something the four-point test was never designed to provide on its own. For definitions of individual roles, see the CRediT roles reference and the broader research-administration dictionary.