CASRAI Dictionary

Tag: author contribution statement

  • Author Contribution: Scientific Reports v Nature

    An author contribution statement scientific reports authors submit typically follows the CRediT (Contributor Roles Taxonomy) format, with each author’s role — Conceptualization, Methodology, Writing – original draft, and so on — listed by name. Nature’s flagship title, by contrast, still asks authors for a free-text paragraph describing who did what. Both satisfy the same publisher-wide authorship policy; only the presentation differs.

    An author contribution statement is a mandatory section of a peer-reviewed manuscript that discloses which contributor performed which part of the research and writing, either in the authors’ own prose or via a standardised taxonomy of role labels.

    What is an author contribution statement?

    An author contribution statement records, for every listed author, the specific work they carried out on a study — conceiving the idea, running the analysis, drafting the manuscript, or supervising the project. Nature Portfolio journals require one for every research paper, including review-type articles, under a shared authorship policy that applies across the group’s titles.

    That policy sets a minimum bar rather than a fixed format. It defines who qualifies as an author using criteria adapted from McNutt et al. (2018, Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.1715374115), and it states plainly that “the level of detail varies” between disciplines and manuscripts. Individual journals then decide, within that floor, how the statement should look on the page.

    How Scientific Reports applies the CRediT format

    In practice, published Scientific Reports articles overwhelmingly present author contributions as a list of named CRediT roles rather than a narrative paragraph. A typical published statement reads along the lines of “J.V.: Conceptualization, Methodology, Software, Validation, Visualization” — role labels drawn directly from the 14-category CRediT contributor role taxonomy. Some published corrections in the journal cite the taxonomy explicitly by its standards home, credit.niso.org.

    Scientific Reports’ own written editorial policy does not, however, mandate CRediT by name. It uses the same core requirement as the flagship title — “a statement of responsibility… that specifies the contribution of every author” — and its official worked example is free text: “AB and CD wrote the main manuscript text and EF prepared figures 1–3.” The structured, role-labelled convention that dominates published papers has therefore emerged from submission-system defaults and community norms across Springer Nature’s high-volume titles, not from a policy clause unique to the journal.

    • CRediT assigns each author one or more of 14 defined roles, from Conceptualization and Data curation to Writing – review & editing.
    • CASRAI originated the CRediT contributor role taxonomy in 2014; the standard is now stewarded by NISO as ANSI/NISO Z39.104-2022.
    • A structured statement makes individual roles machine-readable, which supports research-integrity checks and contribution-based assessment.

    How Nature’s free-text convention differs

    Nature’s own house style has favoured a narrative “Author contributions” paragraph since it began publishing them, an editorial policy first announced in the journal’s 3 June 1999 piece, Author contributions, and reinforced across sister titles when several introduced the practice in July 2006. Subsequent editorials — including Nature Photonics’ Contributors, guests, and ghosts (2012) and Nature Materials’ Authorship matters (2008) — defended the free-text paragraph as a way to capture nuance in collaborative, cross-disciplinary teams rather than forcing contributions into fixed categories.

    That format persists at Nature today. Authors are still asked to write a short paragraph explaining, in their own words, who conceived the study, generated the data, or drafted the text, rather than selecting from a standardised role list. Some individual papers in Nature-branded research titles have nonetheless adopted CRediT-labelled wording voluntarily, showing that the flagship’s free-text convention is a house-style default rather than an absolute rule.

    Why one publisher permits two conventions

    Springer Nature’s authorship policy is deliberately format-agnostic: it requires a contribution disclosure for every author but leaves the presentation to each journal’s editorial team. That editorial autonomy is why Scientific Reports, a high-volume multidisciplinary journal, has settled into a structured, role-labelled convention that scales across tens of thousands of submissions a year, while Nature, a lower-volume flagship title with a strong narrative house style, has kept the free-text paragraph it pioneered in 1999.

    Feature Scientific Reports Nature (flagship)
    Typical published format Structured CRediT role list Free-text narrative paragraph
    Named taxonomy required by written policy Not explicitly named Not applicable (no taxonomy used)
    Governing policy floor Nature Portfolio authorship policy Nature Portfolio authorship policy
    Standards reference for the taxonomy ANSI/NISO Z39.104-2022 (credit.niso.org) Not applicable
    Policy’s own worked example Free text (“AB and CD wrote…”) Free text (narrative paragraph)

    Common questions on author contribution statements

    What is an author contribution statement example?

    A typical example lists each author’s initials against a specific role, such as “J.S.: Conceptualization, Data curation; A.B.: Writing – original draft.” A free-text equivalent describes the same information in prose, for example “J.S. designed the study; A.B. drafted the manuscript.” Both forms are accepted across different journals.

    What are the criteria for author contribution?

    Under the criteria Nature Portfolio journals apply, adapted from McNutt et al. (2018, PNAS), an author must have made a substantial contribution to the work’s conception, data, or software; have approved the submitted version; and have agreed to be personally accountable for their share of the work, including its accuracy and integrity.

    What are author contributions?

    Author contributions are the specific, individually attributed tasks each listed researcher performed on a published study, covering activities such as conceptualisation, methodology, formal analysis, investigation, writing, and supervision. They are disclosed either as free text or via the standardised CRediT taxonomy, and appear in the published article.

    How do you write an author contribution statement?

    Draft it against a fixed checklist of roles — conception, data acquisition, analysis, drafting, revision, and approval — then either list initials next to the matching CRediT role labels or convert the same information into a short narrative paragraph, depending on the target journal’s house style. Confirm the format required before submission rather than after acceptance.

    The practical implication for anyone submitting to both journals is straightforward: draft the fullest possible CRediT-labelled breakdown of each author’s role regardless of house style. A structured statement converts cleanly into Nature’s free-text paragraph by simply narrating the same roles, but the reverse conversion — extracting discrete, machine-readable roles from a vague prose paragraph after the fact — is far harder to do accurately. Given Springer Nature’s own ten-year review of CRediT adoption highlights continuing gaps in how consistently contribution data is captured, authors who standardise their internal record-keeping around the 14 CRediT roles from the outset will be better placed whichever journal, and whichever house style, they end up submitting to next.

  • Author Contribution Statement for Case Reports

    An author contribution statement example for a case report should list only the roles that genuinely apply to one or two authors — typically conceptualisation, investigation, and writing — rather than force-fitting all fourteen CRediT categories built for large research teams. For a sole author, a single sentence confirming full responsibility across the applicable roles satisfies both journal policy and ICMJE authorship criteria.

    An author contribution statement is a short, published declaration — separate from the acknowledgements — that specifies which named author performed which part of the research and writing. Below is a practical, minimal-author template for case reports, built around the taxonomy’s actual scope rather than a mechanical checklist.

    What is an author contribution statement, and why do case reports struggle with it?

    An author contribution statement is a brief, structured account — usually one to three sentences per author — of who conceived, conducted, and wrote a published work. CASRAI originated the CRediT contributor role taxonomy in 2014, and the standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, defining fourteen discrete contributor roles: Conceptualization, Data Curation, Formal Analysis, Funding Acquisition, Investigation, Methodology, Project Administration, Resources, Software, Supervision, Validation, Visualization, Writing – Original Draft, and Writing – Review & Editing.

    The taxonomy was designed for multi-author, multi-institution collaborations where credit disputes and hidden labour are real risks. A single-author case report has no such dispute to resolve — one person, by definition, performed every applicable role. Forcing all fourteen categories onto one or two names produces a statement that reads as padding rather than disclosure, which is precisely the awkward fit this template addresses.

    How do you write a single-author case report contribution statement?

    For a sole-author case report, the statement should confirm that the author meets the ICMJE authorship criteria in full, without listing categories that plainly do not apply (Software, Funding Acquisition, and Project Administration are the ones most often irrelevant to a single clinical case). The International Committee of Medical Journal Editors requires that every listed author:

    • Made a substantial contribution to the conception, design, acquisition, analysis, or interpretation of the case;
    • Drafted the work or revised it critically for important intellectual content;
    • Approved the final version for publication; and
    • Agreed to be accountable for all aspects of the work’s accuracy and integrity.

    A minimal, publication-ready example: “The author conceived the case report, collected and interpreted the clinical data, drafted the manuscript, and approved the final version for submission.” A CRediT-tagged variant works equally well: “Author Name: Conceptualization, Investigation, Writing – Original Draft, Writing – Review & Editing.” Both versions satisfy journal policy; the second is preferable where the target journal explicitly asks for CRediT-labelled statements rather than free text.

    How do you split CRediT roles between two authors in a case report?

    With two authors — commonly a treating clinician and a co-author handling the literature review or write-up — the statement should separate clinical-care roles from writing roles rather than duplicating the full taxonomy for each name. This keeps the statement honest: a supervising consultant who reviewed but did not draft the manuscript should not appear under Writing – Original Draft.

    CRediT role Typical applicability to a case report Notes
    Conceptualization Applies Identifying the case as reportable
    Investigation Applies Clinical assessment, data gathering
    Writing – Original Draft Applies Usually one named drafting author
    Writing – Review & Editing Applies Supervising or co-author input
    Supervision Rarely applies Only where a senior author directed the case work
    Validation Rarely applies Relevant only if data required independent checking
    Data Curation Rarely applies Usually not distinct from Investigation in a case report
    Software, Funding Acquisition, Project Administration, Resources, Formal Analysis, Visualization, Methodology Usually N/A Omit rather than force-fit for a single case

    Example two-author statement: “Dr A managed the patient, conceived the report, and revised the manuscript critically. Dr B conducted the literature review and drafted the manuscript. Both authors approved the final version and agree to be accountable for its accuracy.” Where a journal mandates CRediT labels specifically, the equivalent tagged form is: “Dr A: Conceptualization, Supervision, Writing – Review & Editing. Dr B: Investigation, Writing – Original Draft.”

    Which journals require this, and in what format?

    Requirements vary by publisher, and case reports are frequently held to the same policy as full research articles even though the taxonomy was not built with them in mind. Elsevier requires a CRediT author statement for all research articles, including case reports, under its published CRediT author statement policy. JMIR treats the Authors’ Contributions section as optional but recommended, per guidance updated by JMIR Publications on 2 February 2026, while Springer/Nature journals commonly request a free-text statement such as “all authors contributed to the study conception and design,” without mandating the full fourteen-role CRediT format.

    Publisher / body Statement required? Format
    Elsevier Mandatory CRediT-tagged roles, degree-of-contribution optional
    Springer / Nature Mandatory (most journals) Free-text narrative statement
    JMIR Optional but recommended Free-text narrative statement
    ICMJE (cross-publisher baseline) Recommended policy, not a form Four-criteria authorship test

    The American Astronomical Society’s journals took the free-text route deliberately: when AASTeX v7.0 introduced Author Contribution sections, the society specified a free-form field “rather than a formulaic set of checkboxes,” precisely because a rigid taxonomy poorly serves papers with unusual author configurations — a principle that extends directly to minimal-author case reports.

    Common questions on author contribution statements

    How to write an author contribution in a case report?

    State each named author’s role using plain, active verbs — conceived, collected, drafted, revised, approved — rather than the full CRediT list. Confirm every author meets all four ICMJE criteria; anyone who does not should move to the acknowledgements instead of the byline.

    How do you write an author’s contribution statement?

    Identify what each author actually did across conception, data work, drafting, and approval, then write one sentence per author naming those tasks. Use either free text or CRediT-tagged roles depending on the target journal’s house style, and have every author confirm the wording before submission.

    What are examples of author contributions?

    Common contribution categories include conceiving the study, acquiring or analysing data, drafting the manuscript, critically revising it, and supervising the work. The CRediT taxonomy formalises fourteen such categories, but a case report typically draws on only three or four of them.

    What is a contribution statement example?

    A minimal example: “The author conceived the case, gathered clinical data, drafted the manuscript, and approved the final version.” This single sentence satisfies ICMJE’s authorship test and works for any single-author case report regardless of specialty.

    What this means for case report authors and editors

    Journals and editorial offices reviewing minimal-author submissions should stop asking authors to populate all fourteen CRediT fields by default. A short, honest, ICMJE-aligned narrative — or a CRediT statement limited to the roles that genuinely applied — better serves both transparency and author time than a taxonomy stretched past its design case. Editors adopting free-text options, as AAS Journals did for astrophysics collaborations of any size, give case report authors a route that neither omits required disclosure nor manufactures roles that were never performed.

    As more publishers formalise contribution statements as a submission requirement rather than an optional courtesy, case report authors gain most by keeping the statement proportional: name every applicable role, omit the rest, and confirm ICMJE accountability explicitly rather than by implication.

  • Author Contribution Statement Examples in Review Articles

    Not all 14 CRediT roles apply to a review article. When a manuscript synthesises existing literature rather than collecting primary data, roles built around experiments, materials and datasets — Investigation, Resources, Data Curation — rarely fit, while Conceptualization, Methodology, Formal Analysis, Visualization and both Writing roles almost always do. An author contribution statement example review article authors can adapt should map contributions to the roles the review actually required, not force every author into a role designed for empirical research.

    The Contributor Roles Taxonomy (CRediT) is a fourteen-role classification system used to describe, in a standardised author contribution statement, exactly what each named author did on a published work. CASRAI originated CRediT in 2014 as a response to opaque, order-of-authorship-only bylines; the taxonomy is now stewarded by NISO as ANSI/NISO Z39.104-2022, with the current definitions maintained at credit.niso.org.

    Which CRediT roles actually apply to a review article?

    Seven to nine of the fourteen CRediT roles map cleanly onto review-article work. Conceptualization covers who framed the review question and scope — always relevant, since every review starts from a defined aim. Methodology covers the design of the search strategy, inclusion/exclusion criteria and, for systematic reviews, the registered protocol.

    Formal Analysis applies wherever authors synthesise findings — statistically in a meta-analysis, thematically in a narrative review. Visualization covers PRISMA flow diagrams, forest plots and summary tables, which most reviews include. Writing – Original Draft and Writing – Review & Editing apply to every author who meets ICMJE’s drafting-or-revising criterion. Supervision, Project Administration and Funding Acquisition apply exactly as they would on any funded, multi-author output.

    Which roles rarely apply when there’s no primary data collection?

    Resources and Data Curation were written for empirical studies: provision of reagents, patients, instrumentation, or management of a generated dataset. A review that only reads and synthesises published sources produces no such materials, so these roles should usually be omitted rather than stretched.

    Software only applies if authors built bespoke code — for example a custom R script for a meta-analysis — not for using standard reference-management tools. Validation, defined by NISO as verifying reproducibility of results or experiments, has no primary experiment to verify in most narrative reviews, though it can legitimately apply to a systematic review’s dual-reviewer screening check.

    Investigation is the most commonly misapplied role in review contribution statements. NISO’s definition ties it to “performing the experiments, or data/evidence collection” — some editors accept that a systematic literature search and screening process counts as evidence collection, while others reserve Investigation strictly for primary data gathering. Because guidance is inconsistent across publishers, review teams should state explicitly what “Investigation” covers in their statement rather than assume a shared reading.

    CRediT role Typical fit for a review article Note
    Conceptualization Applies Framing the review question and aims
    Methodology Applies Search strategy, protocol, screening criteria
    Investigation Contested Literature search sometimes counted, sometimes not
    Formal Analysis Applies Statistical or thematic synthesis
    Data Curation Rarely applies No generated dataset in most reviews
    Resources Rarely applies No materials, patients or instrumentation
    Software Rarely applies Only if bespoke analysis code was built
    Validation Rarely applies Occasional fit for dual-reviewer screening checks
    Visualization Applies PRISMA diagrams, forest plots, summary tables
    Writing – Original Draft Applies Always, for drafting authors
    Writing – Review & Editing Applies Always, for revising authors
    Supervision Applies Senior-author oversight
    Project Administration Applies Coordinating multi-reviewer teams
    Funding Acquisition Applies If the review was funded

    Does it differ between narrative and systematic reviews?

    Yes. A systematic review generates far more CRediT-relevant activity than a narrative review because it follows a documented protocol. Formal database searching, dual-reviewer screening, a PRISMA flow diagram and, often, a meta-analysis all create genuine Methodology, Formal Analysis and Visualization contributions.

    A narrative review, by contrast, typically compresses most of the work into Conceptualization and the two Writing roles, since there is no registered protocol or formal extraction process to document separately. Authors of narrative reviews should resist copying a systematic-review template wholesale — an author contribution statement that lists Investigation, Validation and Data Curation for a narrative review with no protocol will look inflated to an editor who knows the difference.

    How do you write the statement itself?

    Springer Nature’s author instructions explicitly accommodate reviews: where “discrete statements are less applicable,” the statement should still identify who had the idea for the article and who performed the literature search, even without a full role-by-role breakdown. JMIR’s author guidance is more direct: “Some roles won’t apply – each research output is different; if specific CRediT roles are not relevant to a particular output, they do not need to be included.”

    A practical three-author example for a systematic review:

    • Conceptualization: A.B. (lead), C.D. (equal)
    • Methodology: A.B., C.D.
    • Formal Analysis: E.F.
    • Visualization: E.F. (lead), A.B. (supporting)
    • Writing – Original Draft: A.B. (lead), C.D. (supporting)
    • Writing – Review & Editing: A.B., C.D., E.F.
    • Supervision: A.B.

    Note what is absent: no Data Curation, Resources, Software or Validation, because none occurred. Under ICMJE’s authorship criteria, every named author must still meet all four conditions — substantial contribution, drafting or revising, final approval, and accountability — regardless of which CRediT roles they are assigned.

    Common questions about author contribution statements

    What is a contribution statement example?

    A contribution statement lists each author’s initials against the specific CRediT roles they performed, such as “A.B.: Conceptualization, Writing – Original Draft; C.D.: Formal Analysis, Writing – Review & Editing.” It replaces vague author-order assumptions with an explicit, auditable record.

    What is the author contribution statement in Springer?

    Springer Nature requires a statement of responsibility in every manuscript, including review-type articles, specifying each author’s contribution. For reviews where a full role-by-role breakdown does not fit, Springer still expects the statement to name who conceived the article and who conducted the literature search.

    How to write an author contribution statement?

    List every author’s initials, then attach the CRediT roles that genuinely apply to their work on that specific manuscript, omitting roles that do not apply rather than padding the list. Corresponding authors are responsible for confirming the statement with every co-author before submission.

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

    Per ICMJE, substantial contribution means conception or design, or acquisition/analysis/interpretation of data, combined with drafting or critically revising the work, final approval, and accountability for its accuracy. Meeting only one criterion, such as literature searching alone, does not by itself satisfy authorship requirements.

    What this means for review authors and editors

    Review teams that copy a data-heavy CRediT template wholesale risk two failure modes: omitting genuine synthesis work under vague “Writing” credit, or inflating the statement with roles like Investigation and Data Curation that a careful editor will question. The more defensible approach is to start from the fourteen roles, keep the seven or eight that genuinely occurred, and state plainly — as JMIR’s guidance recommends — that the rest were not applicable to this output.

    As more publishers formalise CRediT for review-type manuscripts under ANSI/NISO Z39.104-2022, expect journal instructions to increasingly distinguish narrative from systematic reviews in their contribution-statement guidance, closing the ambiguity that currently surrounds roles like Investigation. Until then, the safest practice for review authors is explicit scoping: name what each role means in this specific manuscript, rather than relying on definitions written for laboratory-based research.

  • Author Contribution Statement Template Guide

    An author contribution statement template is a reusable format — a CRediT checkbox grid, a free-text paragraph, or a footnote listing — that records exactly what each named author did on a manuscript, so researchers do not have to draft the disclosure from scratch for every journal. Keep one master version covering all three formats and you can adapt it to any publisher’s house style in minutes rather than hours.

    An author contribution statement is a manuscript section, distinct from the author byline itself, that specifies precisely which tasks — conceiving the study, collecting data, analysing results, drafting text — each co-author performed. This guide sets out the three formats journals actually use, gives a build-once workflow for a master statement, and answers the questions authors most often ask before submission.

    What is an author contribution statement?

    An author contribution statement discloses who did what on a piece of published research, separately from the order of names on the byline. It exists because author order alone is an unreliable signal: conventions differ across disciplines, some fields list contributors alphabetically, others by seniority or effort, and none of those orderings tell a reader, a funder, or a hiring committee what a specific person actually contributed.

    The International Committee of Medical Journal Editors (ICMJE) ties this disclosure to four authorship criteria: substantial contribution to conception, design, data acquisition, analysis or interpretation; drafting or critically revising the work; final approval of the version published; and agreement to be accountable for its accuracy. A contribution statement is the mechanism journals use to make those criteria checkable rather than assumed.

    The three formats journals actually use

    Publishers do not converge on one house style. In practice, submissions land in one of three formats, and the format a journal picks determines how much structure your statement needs before you paste it in.

    Format Used by (examples) Structure Degree-of-contribution field
    Checkbox/grid (CRediT) Elsevier, Wiley journals Each author ticked against a fixed set of standardised roles Yes — typically Lead, Equal, Supporting
    Free-text paragraph JMIR, Springer, AAS Journals A short narrative sentence or two per author Optional, author’s own wording
    Footnote / tiered listing Large multi-author collaborations, some society journals Annotation on the author list itself, or grouping into contribution tiers Sometimes, at tier level only

    The CRediT checkbox grid

    The most structured option is the Contributor Roles Taxonomy (CRediT), a fixed set of 14 roles — including Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Supervision, and Writing (original draft and review & editing) — against which each author’s involvement is marked. Elsevier and Wiley both require submitting authors to complete a CRediT taxonomy grid, and many other publishers now embed the same taxonomy in their submission systems. CASRAI originated the CRediT contributor role taxonomy in 2014. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, which defines the current 14 CRediT roles and their permitted degree qualifiers.

    The free-text paragraph

    Some journals deliberately avoid a fixed taxonomy. JMIR’s author guidance describes the Authors’ Contributions section as specifying “the exact contributions of each author in a narrative form” — an optional section, included in the final publication only if the authors provide it. The American Astronomical Society (AAS) took the same route when it introduced Author Contribution statements in AASTeX v7.0: rather than a checkbox set, it built a free-form text field, reasoning that the variety of contribution types across large collaborations — alphabetical author lists, tiered author groups, citizen-science participants — does not map cleanly onto a fixed vocabulary. AAS also notes the statement helps authors comply with funding-agency guidelines, including those of the US National Science Foundation.

    The footnote or tiered listing

    Large collaborations — common in astrophysics, high-energy physics, and some clinical consortia — often annotate the author list itself rather than writing a separate paragraph per person. Authors may be grouped into tiers (for example, “Authors 1–4 led the analysis and writing; Authors 5–13 contributed to interpretation”), with footnote-style superscripts marking equal contribution or joint leadership. This format trades individual granularity for the ability to credit dozens or hundreds of contributors without an unwieldy statement.

    How to build one master statement and adapt it fast

    Because you cannot predict in advance which format a target journal will require, the efficient approach is to draft contribution information once, at the most granular level, and derive the other formats from it rather than starting over each time.

    1. Draft against the 14 CRediT roles first, even if your target journal does not use CRediT — it is the most granular schema and everything else can be compressed from it.
    2. Record a degree-of-contribution qualifier (Lead, Equal, Supporting) for each role and each author while memories are fresh, ideally at manuscript submission rather than at revision.
    3. Write a one-paragraph narrative fallback by converting the CRediT grid into plain sentences — this becomes your free-text version for journals like JMIR or Springer.
    4. Keep a tiered/footnote version ready if you anticipate submitting to a large-collaboration venue, grouping authors by contribution level rather than role.
    5. Before each submission, check the target journal’s Guide for Authors and paste in whichever of the three pre-built versions matches its required format, trimming role names only where the journal’s own vocabulary differs from CRediT’s.

    Store all three versions in your manuscript tracking file alongside co-author sign-off. The authorship criteria a statement must satisfy do not change between formats — only their presentation does — so a single accurate source of truth prevents the statement drifting from what actually happened as it gets re-formatted for each journal.

    Frequently asked questions

    How do you write an author’s contribution statement?

    Write an author contribution statement by listing each author against specific, verifiable actions — using CRediT’s 14 roles where the journal requires them, or a short narrative paragraph where it does not. State the degree of contribution (Lead, Equal, Supporting) and have every co-author confirm the wording before submission.

    What is the author’s contribution statement?

    An author’s contribution statement is a manuscript section that specifies exactly what each named author did — conceiving the study, collecting data, analysing results, drafting or revising text — rather than relying on author-list order to imply credit. ICMJE ties this disclosure to its four authorship criteria.

    What are examples of author contributions?

    Typical contribution examples include Conceptualization (designing the study), Investigation (running experiments), Formal analysis (statistics), Writing – original draft, and Supervision. Under CRediT, each is tagged Lead, Equal, or Supporting per author, producing a record more granular than author order alone.

    What is a contribution statement example?

    A narrative example: “A.B. conceived the study and wrote the first draft. C.D. collected and analysed the data. E.F. supervised the project and acquired funding. All authors reviewed and approved the final manuscript.” A CRediT example replaces this sentence with a per-author role grid instead.

    What this means for authors and institutions

    For individual researchers, maintaining one detailed master statement — rather than reconstructing contributions at each submission — reduces both drafting time and the risk of inconsistent or disputed credit between co-authors. For institutions and research offices, a standard internal template that captures CRediT-level detail regardless of a given journal’s public-facing format gives promotion, tenure, and grant-reporting processes a consistent, auditable record of who did what, independent of any single publisher’s house style.

    As more publishers embed CRediT directly into submission systems, free-text and footnote formats are likely to persist mainly where author-list conventions — large collaborations, alphabetical listings, citizen-science co-authorship — do not map cleanly onto a fixed taxonomy. Building your contribution record to CRediT’s granularity now, and compressing it downward per journal, is the format-agnostic way to stay ready for either direction.

  • CRediT Taxonomy Investigation: Not Misconduct

    The credit taxonomy investigation role — formally “Investigation” in CRediT — covers hands-on data and evidence collection: running experiments, gathering samples, and testing hypotheses. It has no connection to a research-misconduct investigation, which is a formal institutional inquiry into fabrication, falsification, or plagiarism. The two share a word, not a meaning, and that overlap causes recurring confusion on author contribution forms.

    CRediT — the Contributor Roles Taxonomy — is a controlled vocabulary of 14 roles used to describe how each named author contributed to a research output. CASRAI originated CRediT in 2014; the standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, and its 14 role definitions are maintained at credit.niso.org.

    Table of contents

    What does “Investigation” mean in the CRediT taxonomy?

    Under ANSI/NISO Z39.104-2022, the credit taxonomy investigation role is defined as “conducting a research and investigation process, specifically performing the experiments, or data/evidence collection.” It is one of 14 defined contributor roles, sitting alongside Conceptualization, Methodology, Formal Analysis, and ten others.

    The role covers the operational middle of a study: the point where a planned method is actually carried out and data starts to exist. NISO’s role definition lists the following as typical Investigation tasks:

    • Following or modifying methods to collect or generate quantitative or qualitative data
    • Testing research hypotheses and documenting the research process
    • Searching and reviewing literature, samples, data, and other evidence
    • Reporting findings for further discussion, analysis, and exchange of ideas

    None of this concerns wrongdoing. A contributor credited with Investigation did fieldwork, ran assays, coded interviews, or otherwise generated the study’s raw material — nothing more, nothing less.

    How is CRediT’s Investigation role different from a misconduct investigation?

    A research-misconduct investigation is a formal institutional process triggered by a credible allegation of fabrication, falsification, or plagiarism. In the United States, the Office of Research Integrity defines these three categories under 42 CFR Part 93, the federal policy governing PHS-funded research. In the UK, institutions follow the UK Research Integrity Office (UKRIO) procedure and the Concordat to Support Research Integrity, and publishers typically follow COPE’s investigation flowcharts once a concern is raised.

    The two processes could not be more different in stakes, actors, or timing. The table below sets out the distinction — and adds a third homonym that also trips up search results: the everyday financial “credit investigation” run by lenders.

    Aspect CRediT “Investigation” role Research-misconduct investigation Financial “credit investigation”
    What it is One of 14 standard contributor-role labels A formal inquiry into research integrity breaches A lender’s check of a borrower’s repayment history
    Governed by ANSI/NISO Z39.104-2022 (CRediT) Institutional policy, UKRIO/COPE (UK), 42 CFR Part 93/ORI (US) Consumer-credit and lending regulation
    Triggered by Submitting a manuscript with an author contribution statement A credible allegation of fabrication, falsification, or plagiarism A loan or credit application
    Who is involved Named authors/contributors and the corresponding author Research integrity officer, appointed committee, the accused Lender, credit reference agency, applicant
    Typical outcome A credited line in the published contribution statement Finding of misconduct, correction, retraction, or exoneration Loan approval, denial, or adjusted terms

    Why does the confusion keep happening on contribution forms?

    Editors and journal staff routinely field author queries asking whether ticking “Investigation” on a CRediT form invites scrutiny of their conduct. It does not. The confusion has three compounding causes.

    First, the word “investigation” already has a dominant everyday meaning tied to wrongdoing — police investigations, misconduct investigations, workplace investigations — so authors default to that association before reading the CRediT-specific definition. Second, publisher-facing CRediT forms often list all 14 roles as bare labels with no inline definition, forcing authors to look up what each term means mid-submission. Third, search behaviour reflects a genuine third homonym: “credit investigation” is also standard terminology in consumer lending, where it means a lender checking a borrower’s repayment history — a completely unrelated financial process that has nothing to do with either scholarly authorship or research integrity.

    This is a naming problem, not a substantive ambiguity. Once a contributor sees the full NISO definition — data/evidence collection — the confusion resolves immediately. The friction is entirely at the point of first encounter, typically an unlabelled checkbox in a submission system.

    How should authors and editors correctly apply the role?

    Authors should select Investigation whenever they personally performed experiments, collected data, ran surveys or interviews, or gathered samples and evidence for the study — regardless of whether they also held other roles such as Methodology or Formal Analysis. CRediT roles are not mutually exclusive; a single contributor commonly holds several.

    Editors and journal staff can reduce the confusion at source by adding the one-line NISO definition directly beside each role checkbox in submission systems, rather than relying on authors to consult an external reference. This single change removes almost all first-time-user hesitation around the Investigation label.

    Institutions drafting internal contribution-disclosure policies should keep CRediT role assignment procedurally separate from any research-integrity policy documentation, even where both appear in the same manuscript-submission workflow, so that the two processes are never conflated administratively.

    Frequently asked questions

    What does “Investigation” mean in CRediT taxonomy?

    In CRediT, “Investigation” is the role covering the research and investigation process itself — performing experiments or collecting data and evidence. It sits alongside 13 other defined roles under ANSI/NISO Z39.104-2022 and describes hands-on data generation, not any form of wrongdoing inquiry.

    What is the CRediT taxonomy?

    CRediT (Contributor Roles Taxonomy) is a standardised, 14-role controlled vocabulary for describing each named author’s specific contribution to a scholarly work. CASRAI originated it in 2014; NISO now stewards it as ANSI/NISO Z39.104-2022, and major publishers including Elsevier, Wiley, Sage, and Taylor & Francis request it at submission.

    What are the criteria for authorship?

    ICMJE’s Recommendations set out four authorship criteria — substantial contribution to conception/design or data acquisition/analysis; drafting or critical revision; final approval of the published version; and accountability for the work’s integrity. Some secondary sources miscount this as five by splitting the first criterion.

    Does “credit investigation” mean the same as CRediT’s Investigation role?

    No. A financial credit investigation is a lender’s check of a borrower’s repayment history before approving a loan — a consumer-lending process with no connection to scholarly authorship. It shares only the surface phrase with CRediT’s data/evidence-collection role.

    Implications for editors and institutions

    Naming collisions like this one are a small but measurable source of submission friction: every unlabelled checkbox that requires an author to context-switch away from the manuscript to look up a definition adds time and risk of miscoding to the metadata that journals, funders, and indexers eventually rely on. Contribution statements feed downstream systems — CrossRef metadata, ORCID records, institutional research-information systems — so a mislabelled or abandoned Investigation entry is not a cosmetic error; it degrades the accuracy of the scholarly record’s provenance data.

    As more funders and institutions move toward requiring structured contribution statements alongside authorship, the practical fix sits with journal and submission-system design, not with the taxonomy itself: inline definitions, tooltips, or a linked glossary at the point of role selection resolve the ambiguity before it becomes a support ticket. The taxonomy’s 14 roles remain stable under ANSI/NISO Z39.104-2022; what needs to improve is how clearly each one is presented at first encounter.

  • 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.

  • MDPI Author Contributions: Compliance Guide

    MDPI requires every submitted manuscript to carry an author contributions statement built on the CRediT taxonomy — a mandatory list of the 14 CRediT roles mapped to author initials, followed by a fixed sign-off sentence. This is stricter than most publishers, many of which still treat CRediT as optional or recommend it only for research articles. Authors who submit across journal families need to know exactly what MDPI checks for, because incomplete or missing statements are a common cause of pre-submission delay.

    The Contributor Roles Taxonomy (CRediT) is a fixed, 14-term vocabulary — Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, and Writing – review & editing — used to describe what each named contributor actually did on a 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 exactly does MDPI require in the author contributions statement?

    MDPI’s Research and Publication Ethics policy states that “for complete transparency, all submitted manuscripts should include an author contributorship statement that specifies the contribution of every author.” For research articles with more than one author, this is not a suggestion — it is a submission requirement checked during manuscript preparation, alongside the standard ICMJE authorship criteria (substantial contribution, drafting or critical revision, final approval, and accountability).

    The statement must be built from the CRediT role list rather than free text. MDPI’s own instructions for authors reproduce the taxonomy directly and ask authors to attach initials to each role that applies. Review articles are treated slightly differently: because CRediT’s experiment-oriented roles (Investigation, Resources, Validation) often do not map cleanly onto a literature synthesis, MDPI instead asks review authors to clarify who conceived the review, conducted the literature search or analysis, and drafted or revised the text.

    What is the required format and wording?

    MDPI publishes a template sentence structure: each CRediT role name is followed by a comma and the initials of the contributing author(s), with roles separated by semicolons. A representative example from MDPI’s own manuscript templates reads:

    “Conceptualization, X.X. and Y.Y.; methodology, X.X.; software, X.X.; validation, X.X., Y.Y. and Z.Z.; formal analysis, X.X.; investigation, X.X.; resources, X.X.; data curation, X.X.; writing—original draft preparation, X.X.; writing—review and editing, X.X.; visualization, X.X.; supervision, X.X.; project administration, X.X.; funding acquisition, Y.Y.”

    The statement must close with a fixed sentence: “All authors have read and agreed to the published version of the manuscript.” Omitting this closing line, or listing contributions in narrative prose instead of the role-and-initials format, is one of the most frequent reasons a manuscript is returned for correction before it proceeds to peer review.

    MDPI author contributions statement — required elements
    Element Requirement
    Vocabulary CRediT’s 14 fixed role terms (no free-text substitutes)
    Attribution unit Author initials, not full names
    Multiple contributors per role List all initials, separated by commas, “and” before the last
    Single-author manuscripts Statement may be omitted; sole authorship implies all roles
    Closing sentence Mandatory: “All authors have read and agreed to the published version of the manuscript.”
    Review articles Narrative statement of conception, search/analysis, and drafting responsibility instead of full role list

    Where is CRediT optional rather than mandatory?

    MDPI’s blanket, all-journal mandate is not universal practice. Publisher policy on CRediT sits on a spectrum, and authors moving between journal families need to check each venue separately rather than reusing one house style:

    • Mandatory, standardised wording — MDPI requires the role-and-initials format described above for every multi-author research article, across all of its journals.
    • Mandatory, house-style variation — publishers such as PLOS and Springer Nature journals require an author contributions statement but permit some variation in how roles are phrased alongside CRediT terms.
    • Recommended, not enforced — some society and smaller specialist journals encourage CRediT statements per ICMJE guidance but do not reject manuscripts that omit them.
    • Journal-editor discretion — a number of journals leave the decision to use CRediT versus a free-text contributions paragraph to the handling editor or field convention.

    This inconsistency is the practical reason a compliance walkthrough matters: an author contributions statement that satisfies one journal family may need reformatting — not rewriting, just reformatting into the fixed CRediT syntax — before it satisfies MDPI.

    What are the common compliance errors authors make?

    Four errors recur across MDPI submission checks, based on the patterns visible in MDPI’s own instructions, templates, and authorship-change forms:

    • Using full names instead of initials. The template format calls for initials only, matched consistently to the author list and the acknowledgements/affiliations sections.
    • Dropping the closing sign-off sentence. The “All authors have read and agreed…” line is treated as part of the statement, not a separate formality.
    • Inventing role labels. Only the 14 defined CRediT terms are accepted; ad hoc labels like “senior author” or “corresponding” are not CRediT roles and do not belong in this statement.
    • Applying the full 14-role template to a review article. Review manuscripts need the narrative conception/search/drafting statement, not the full experimental role list.

    Answer-first Q&A

    What are author contributions for MDPI?

    MDPI defines author contributions as a mandatory statement, built from the CRediT taxonomy, specifying which named author performed which of the 14 defined roles. It sits alongside MDPI’s authorship criteria, which mirror ICMJE‘s four conditions: substantial contribution, drafting or critical revision, final approval, and accountability for the work.

    What are examples of author contributions?

    Examples include Conceptualization (formulating research goals), Methodology (designing the study), Software (writing code), Formal analysis (running statistical tests), Data curation (managing datasets), and Writing – original draft. MDPI requires initials against each applicable role, not a general description.

    What this means for multi-journal authors

    Research groups publishing across MDPI, society journals, and mixed-model publishers gain the most by drafting one internal CRediT-mapped contributions record per manuscript at submission time, then reformatting the output to match each target journal’s house style — role-and-initials for MDPI, narrative or hybrid formats elsewhere. Because CRediT is a fixed vocabulary rather than a publisher-owned format, the underlying role assignments do not change between venues; only the presentation does. Consulting the CRediT contributor roles reference before submission, and cross-checking definitions against the research administration dictionary, reduces the back-and-forth that a mismatched contributions statement otherwise creates at the editorial-office stage.

    As more funders and institutions request structured contributorship data for assessment exercises, publisher-level enforcement patterns like MDPI’s are likely to become the norm rather than the exception, making early, consistent CRediT-mapping practice a durable habit rather than a one-off compliance task.

  • 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.

  • How to Write a CRediT Author Contribution Statement (Template and Examples)

    Journal submission systems increasingly reject manuscripts that arrive without a properly structured author contribution statement, and editorial offices report that vague statements — “all authors contributed equally,” with no further detail — are now routinely sent back for revision. For research administrators fielding last-minute questions from principal investigators the night before a submission deadline, having a ready-made author contribution statement template that maps each co-author to a defined role saves time and prevents authorship disputes later in the process.

    This article sets out a practical, copy-paste template built around the CRediT contributor role taxonomy, walks through worked examples for different paper types, and explains what institutions need to check before a manuscript goes out the door.

    What an Author Contribution Statement Actually Requires

    An author contribution statement is a structured declaration, published alongside a journal article, that specifies who did what during the research and writing process. It exists to solve a specific problem: traditional author bylines and acknowledgements sections tell readers nothing about the nature or extent of each person’s involvement. A statement that simply lists names in order gives no indication of who designed the study, who ran the statistical analysis, who supervised the project, or who wrote the manuscript.

    CASRAI originated the CRediT contributor role taxonomy in 2014. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022. CRediT defines fourteen 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 — that can be assigned to one or more contributors, with more than one contributor permitted per role and more than one role permitted per contributor.

    ICMJE authorship criteria and CRediT are complementary rather than interchangeable. ICMJE sets the threshold for who qualifies as an author at all (substantial contribution, drafting or revising, final approval, and accountability); CRediT then describes what each qualifying author actually did. COPE guidance on authorship disputes increasingly points editors toward requiring both.

    Building the Template: A Role-by-Author Matrix

    The most reliable format is a simple matrix with author names as rows (or columns) and the fourteen CRediT roles as the other axis. Research offices can maintain this as a shared spreadsheet template that travels with the manuscript from first draft to submission, updated as contributions evolve.

    • Author name — full name as it will appear on the byline, ideally cross-checked against the author’s ORCID iD, which many journals and funders (including UKRI) now require at submission.
    • Role(s) held — one or more of the fourteen CRediT terms, selected only where the contribution was genuine and substantial.
    • Degree of contribution (optional) — some journals allow “lead,” “equal,” or “supporting” qualifiers per role; check the target journal’s author guidelines before adding this layer, since not all publishers support it.
    • Corresponding author flag — mark who holds ongoing responsibility for the record post-publication.

    A minimal version of the matrix, ready to adapt, looks like this:

    • Author A: Conceptualization, Methodology, Writing – Original Draft, Supervision
    • Author B: Data Curation, Formal Analysis, Visualization
    • Author C: Investigation, Validation, Writing – Review & Editing
    • Author D: Funding Acquisition, Project Administration, Resources

    This structure is what most major publisher submission portals (Elsevier, Springer Nature, PLOS, Wiley) expect when they prompt for CRediT roles at the metadata stage — the matrix simply needs transcribing into whatever field format the portal provides.

    Author Contribution Statement Example and a Contributorship Statement Example

    Below is a full author contribution statement example for a typical multi-author empirical paper, written in the prose format many journals still request alongside or instead of a table:

    “A.S. and B.T. contributed to Conceptualization and Methodology. B.T. performed the Formal Analysis and Data Curation. C.O. carried out Investigation and Validation. A.S. wrote the original draft; B.T. and C.O. contributed to Writing – Review & Editing. D.M. was responsible for Funding Acquisition, Project Administration, and Supervision. All authors approved the final manuscript.”

    For a systematic review or evidence synthesis — a paper type common in research-administration and health-policy fields — a contributorship statement example might instead read:

    “E.K. and F.R. conceived the review question and developed the Methodology. G.P. conducted the systematic search and Data Curation. E.K. and G.P. performed Formal Analysis and Validation of extracted data. F.R. supervised the project and acquired funding. All three authors contributed to Writing – Original Draft and Writing – Review & Editing.”

    Note what both examples avoid: generic phrases like “helped write the paper” or “assisted with data” that map to no specific CRediT term. Precision here is what distinguishes a compliant statement from one an editor will bounce back.

    Common Pitfalls When Drafting a CRediT Author Statement

    Research offices reviewing statements before submission should watch for a handful of recurring errors:

    • Assigning roles nobody actually performed. A CRediT author statement is a factual record, not a courtesy list. Honorary authorship — adding a senior colleague’s name to roles they did not perform — is precisely the practice ICMJE and COPE guidance are designed to prevent, and it creates institutional liability if challenged during a research-integrity review.
    • Confusing acknowledgement-level input with authorship-level contribution. Someone who provided reagents, proofread a draft, or gave informal feedback may belong in an acknowledgements section rather than the CRediT matrix.
    • Omitting the statement from preprints. As preprint posting on servers before peer review has become standard practice across most disciplines, contribution statements should be finalised at preprint stage, not left until journal submission, since author order and roles rarely change between the two.
    • Leaving ORCID iDs out of the record. Where ORCID identifiers are captured alongside CRediT roles in the submission system, they become part of the machine-readable metadata that DataCite and CrossRef propagate — omitting them means the contribution record cannot be reliably linked back to the individual researcher.

    What This Means for Research Administrators

    Institutional research offices are well placed to normalise use of a standard author contribution statement template across departments rather than leaving each research group to invent its own format. A shared template reduces the volume of late-stage authorship disputes that land on ARMA, NCURA, and EARMA members’ desks, and it gives institutions a defensible record if a contribution is later questioned during misconduct proceedings. It also supports REF-style research assessment exercises, where evidence of individual contribution to collaborative outputs is increasingly relevant to how research offices document and attribute institutional outputs ahead of the REF 2029 cycle.

    Embedding the CRediT matrix into existing manuscript-tracking or grant-reporting systems — rather than treating it as a one-off form completed at submission — means the data is captured once and can be reused for funder reporting, ORCID record updates, and internal recognition processes such as promotion and tenure dossiers.

    Conclusion

    The direction of travel is toward contribution statements becoming as routine and structured as reference lists. As funders including UKRI continue to formalise expectations around researcher recognition and as more publishers make CRediT fields mandatory rather than optional at submission, institutions that already have a standard template in circulation will adapt with far less friction than those drafting one for the first time under deadline pressure. Building that template now — and keeping it current with the fourteen CRediT terms as stewarded by NISO — is a modest administrative investment against a recurring compliance and integrity risk.

  • CRediT Taxonomy Explained: The 14 Contributor Roles and How Journals Use Them

    Ask any corresponding author who has assembled a multi-institution, multi-national research team what “authorship” actually means, and you will get a different answer depending on discipline, country and journal house style. That ambiguity is precisely the problem the credit taxonomy was built to solve. Rather than a single, opaque byline, the taxonomy breaks a research contribution into 14 discrete, labelled roles — from conceptualisation to writing — so that readers, funders and institutions can see who actually did what.

    The taxonomy is no longer a niche publishing curiosity. As research integrity scrutiny intensifies — driven by concerns over paper mills, honorary authorship and AI-assisted drafting — journals, funders and institutions are leaning harder on structured contributor statements to create an auditable record of who is accountable for which part of a paper. Publishers including Elsevier, PLOS, Springer Nature and the Royal Society now require or strongly encourage CRediT statements at submission, and the taxonomy sits inside metadata standards used by CrossRef and DataCite.

    CASRAI originated the CRediT contributor role taxonomy in 2014. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, which formalised the 14 roles, their definitions, and guidance for degree-of-contribution qualifiers (“lead”, “equal”, “supporting”). Understanding that lineage matters: CASRAI’s role was to identify a gap and convene the working group that built the first version; NISO’s role is to maintain, version and publish the accredited American National Standard that publishers now cite in their author guidelines.

    What the Credit Taxonomy Actually Covers

    The credit taxonomy author contributions framework replaces the single word “authorship” with 14 named roles, each with a formal definition in ANSI/NISO Z39.104-2022:

    • Conceptualization — formulation of the overarching research goals and aims.
    • Data curation — management activities to annotate, scrub and maintain research data for initial use and later reuse.
    • Formal analysis — application of statistical, mathematical, computational or other formal techniques to analyse study data.
    • Funding acquisition — acquisition of the financial support for the project leading to the publication.
    • Investigation — conducting the research and investigation process, including data/evidence collection.
    • Methodology — development or design of methodology; creation of models.
    • Project administration — management and coordination responsibility for the research activity planning and execution.
    • Resources — provision of study materials, reagents, patients, laboratory samples, instrumentation or other analysis tools.
    • Software — programming, software development, testing existing code and algorithms.
    • Supervision — oversight and leadership responsibility for research planning and execution, including mentorship.
    • Validation — verification of the overall replication or reproducibility of results.
    • Visualization — preparation, creation or presentation of data visualisation.
    • Writing – original draft — creation or presentation of the published work, specifically drafting the initial version.
    • Writing – review & editing — critical review, commentary or revision of the original draft, including pre- or post-publication stages.

    Each role can be assigned to multiple contributors, and each contributor can hold multiple roles. This is the core innovation behind the credit taxonomy author contributions model: authorship is decomposed into a matrix rather than a ranked list, which is far closer to how collaborative science actually happens.

    How Journals Implement Contributor Role Statements

    Most journals that adopt the taxonomy ask authors to complete a credit authorship contribution statement during submission, typically rendered as a short paragraph or table published alongside the article. A typical statement reads something like: “Author A: Conceptualization, Methodology, Writing – original draft. Author B: Data curation, Formal analysis, Visualization. Author C: Supervision, Funding acquisition, Writing – review & editing.”

    Implementation varies by publisher, but common patterns include:

    • Mandatory at submission — many journals now require every listed author to have at least one assigned role before a manuscript can proceed to review.
    • Machine-readable metadata — roles are increasingly embedded in JATS XML and exposed through CrossRef metadata, allowing role data to travel with the article’s DOI record.
    • Linkage to ORCID — pairing CRediT roles with ORCID iDs lets institutions and funders trace named contributions back to a persistent researcher identity, closing a long-standing gap in research information management systems.
    • Degree-of-contribution qualifiers — ANSI/NISO Z39.104-2022 permits optional “lead”, “equal” or “supporting” qualifiers within a role, giving finer resolution than the base 14 categories alone.

    Editors report that structured statements make disputes easier to resolve: when an authorship disagreement or a correction is required, a role-based record narrows the question from “was this person an author?” to “did this person perform the specific work described?” — a much more tractable question for editors, ombudspersons and research integrity officers to adjudicate.

    Why the Distinction Between Origination and Stewardship Matters

    The casrai credit taxonomy history is frequently misstated online, including in some outdated encyclopaedic sources, as an active CASRAI product. It is not. CASRAI’s contribution was convening the original working group in 2012–2014 that defined the initial 14-role structure, drawing on earlier contributor-role experiments from journals such as PLOS and Cell Press. Once the taxonomy matured, formal standards maintenance — versioning, public comment periods, accredited balloting and long-term stewardship — moved to NISO, which published it as ANSI/NISO Z39.104-2022 following the ANSI standards development process.

    This origination-to-stewardship handover is not unusual in standards development. It mirrors how many community-built specifications eventually pass to a formal standards development organisation for durable governance once adoption reaches critical mass. For research administrators citing the taxonomy in policy documents, institutional repositories or grant guidance, the precise and defensible framing is: CASRAI originated the CRediT contributor role taxonomy in 2014; NISO now stewards it as ANSI/NISO Z39.104-2022. Referring to it as “CASRAI’s taxonomy” in the present tense is both inaccurate and liable to be flagged by fact-checked reference sources such as Wikipedia and Wikidata.

    What This Means for Research Administrators

    For institutions managing research information systems, grant reporting and REF-style assessment exercises, the credit contributor roles taxonomy has practical downstream value beyond publishing compliance:

    • REF 2029 preparation. As UK institutions build evidence portfolios for the next Research Excellence Framework cycle, structured contribution data offers a defensible, granular basis for attributing outputs to individual researchers — particularly for large consortium papers where a simple author list undercounts specialist contributions such as data curation or software development.
    • Funder compliance. UKRI, and funders operating under cOAlition S principles, increasingly expect transparent reporting on who performed funded work. CRediT statements give research offices a ready-made audit trail linking funding acquisition and investigation roles to named, ORCID-identified individuals.
    • Early-career recognition. Role-based statements make visible the substantive contributions — data curation, formal analysis, validation — that early-career researchers often perform without corresponding authorship order recognition, supporting more equitable credit in tenure, promotion and grant review.
    • Research integrity investigations. When misconduct allegations or authorship disputes arise, institutions handling COPE-aligned investigations benefit from having a role-level record rather than relying on reconstructed, after-the-fact accounts of who did what.
    • AI disclosure boundaries. As journals refine policy on generative-AI use in manuscript preparation, the taxonomy’s discrete roles — particularly “Writing – original draft” and “Formal analysis” — provide a clear structural hook for AI-contribution disclosure statements, since AI tools cannot hold a CRediT role but their use within a role can be flagged.

    Looking Ahead

    The credit taxonomy has moved from an experimental publishing initiative to a formally accredited NISO standard embedded in submission systems, metadata schemas and institutional policy. As research integrity pressures grow and funders demand finer-grained accountability, expect broader mandatory adoption across disciplines that have historically lagged — humanities and some social sciences among them — and tighter integration with ORCID, CrossRef and institutional CRIS platforms. For research administrators, the practical task now is less about explaining what CRediT is and more about embedding it correctly into submission workflows, grant reporting templates and REF evidence pipelines — while keeping the origination history accurate: an idea CASRAI helped originate in 2014, now maintained as a durable, versioned American National Standard under NISO’s stewardship.