CASRAI Dictionary

Tag: casrai credit taxonomy

  • 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.

  • CRediT Contribution Taxonomy: The Humanities Gap

    The CRediT contribution taxonomy is a 14-role vocabulary built at a 2012 biomedical-sciences workshop, and three of its roles — Investigation, Software and Resources — describe laboratory research so specifically that they routinely fail to capture what happens in archival, ethnographic or purely theoretical scholarship. That mismatch is a design artefact of CRediT’s origin, not a flaw researchers should paper over by force-fitting their work into the nearest lab-shaped box.

    The credit contribution taxonomy is best understood as a controlled vocabulary of contributor roles, not a universal grammar of scholarly labour. CASRAI originated the CRediT contributor role taxonomy in 2014; the standard is now stewarded by NISO as ANSI/NISO Z39.104-2022. Understanding where that STEM-derived vocabulary strains against humanities and social science (HSS) practice helps journals, university presses and research offices apply it honestly rather than awkwardly.

    CRediT is a controlled, 14-role vocabulary for describing individual contributions to a research output, developed to replace ambiguous author-order conventions with discrete, attributable roles.

    What is the CRediT taxonomy and where did it come from?

    CRediT emerged from a 2012 workshop convened by the Wellcome Trust and Harvard University, bringing together biomedical scientists, publishers and funders to fix a specific problem: author-order lists that concealed who actually did what on a laboratory paper. CASRAI took over stewardship in 2014 and formalised the 14-role vocabulary in 2015.

    In 2022, CRediT was formally adopted as ANSI/NISO Z39.104-2022, with machine-readable metadata built for JATS XML manuscript pipelines. The roles were never designed with archival, ethnographic or purely theoretical research workflows in the room — a gap that was structural from the outset, not an oversight that later revisions quietly fixed.

    Which CRediT roles map poorly onto humanities and social science work?

    Three roles carry the clearest fingerprints of their laboratory origin. Each assumes a mode of working — bench experiments, code, physical materials — that has no direct equivalent in much archival, ethnographic or theoretical scholarship.

    • Investigation is defined as “performing the experiments, or data/evidence collection” — language built for wet-lab or fieldwork protocols. An archival historian spending eighteen months in a single repository, or a philosopher building an argument from primary texts, is doing investigative labour that this wording does not naturally describe.
    • Software assumes programming and code as a discrete, separable contribution. Much qualitative and theoretical scholarship has no computational layer at all, so the role sits permanently empty on the contributor statement — not because no comparable labour occurred, but because the taxonomy has no slot for it.
    • Resources lists “reagents, materials, patients, laboratory samples, animals, instrumentation” — a checklist with no analogue for archival access negotiated with a rights holder, oral-history interview subjects recruited over years, or a rare manuscript collection consulted under restricted access.

    The table below maps each role’s STEM-native definition against the closest HSS reality it is asked to cover.

    CRediT role STEM-native definition HSS scholarship it is asked to cover
    Investigation Performing experiments or data/evidence collection Archival research, ethnographic fieldwork, oral history, close textual analysis
    Software Programming, code, computational tools No equivalent in most theoretical or literary scholarship
    Resources Reagents, samples, instrumentation, materials Archival access, informant recruitment, rare-collection consultation

    What does the evidence say about CRediT outside STEM?

    The mismatch is documented, not merely anecdotal. A 2025 study published in Accountability in Research examined the contributor role taxonomy’s use in library and information science journals and found the existing 14 roles were not a comfortable fit for social-science-style contributions. Vasilevsky et al. (2021), also in Accountability in Research, argued that authorship alone is insufficient for collaborative research and called for contributor-role systems to be extended beyond their original scope.

    Matarese and Shashok, writing in Publications (2019), found that CRediT’s categories can be too coarse even within the biomedical contexts it was built for, prompting proposals for revision. A separate study of a psychology research project found that independent raters classifying the same contributions showed low agreement on both the number and type of roles involved — evidence that the taxonomy’s boundaries are harder to apply consistently than its clean 14-item list suggests.

    The International Committee of Medical Journal Editors (ICMJE) has separately noted that documenting contributions with CRediT or any similar scheme “leaves unresolved the question of the quantity and quality of contribution that qualify an individual for authorship” — a caveat that applies with equal force to HSS disciplines, where sole authorship and non-hierarchical intellectual debt are already harder to parcel into discrete roles.

    How can journals and institutions adapt CRediT for HSS scholarship?

    Adapting CRediT for archival, ethnographic or theoretical work does not require abandoning it. It requires using it honestly rather than stretching its STEM vocabulary to breaking point.

    1. Leave roles blank rather than force-fitting them. CRediT does not require every role to be filled for every output; an empty Software field on a monograph chapter is accurate, not a gap to be papered over.
    2. Pair CRediT with a free-text supplementary statement for contributions the 14 roles do not describe — archival negotiation, translation, fieldwork access-brokering — rather than mislabelling them as “Investigation” or “Resources” for the sake of completing the form.
    3. Treat single-authored HSS works as a distinct case, where the contributor/author distinction that CRediT was built to clarify may simply not apply, rather than applying it cosmetically.
    4. Track discipline-specific extension proposals emerging from library and information science and other social-science-adjacent fields, several of which have proposed additional or renamed roles rather than a wholesale replacement taxonomy.

    Answer-first Q&A on CRediT and contributor roles

    What is the CRediT taxonomy?

    The CRediT taxonomy is a standardised, 14-role controlled vocabulary for describing individual contributions to a scholarly research output, used instead of, or alongside, traditional author-order bylines. It was originated by CASRAI in 2014 and is now formalised as ANSI/NISO Z39.104-2022, with each role carrying a unique, machine-readable identifier.

    What are the 14 roles of CRediT taxonomy?

    The 14 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. They are organised without hierarchy, and contributors may hold multiple roles on a single output.

    What does Investigation mean in CRediT taxonomy?

    Investigation is officially defined as “conducting a research and investigation process, specifically performing the experiments, or data/evidence collection.” That phrasing centres experimental and fieldwork-style data gathering, which is why archival research, close reading and theoretical argument-building sit awkwardly inside a role written for laboratory or survey-based evidence collection.

    How do I CRediT someone in a research paper?

    Authors typically complete a CRediT statement at submission, assigning each named contributor one or more of the 14 roles, optionally with a degree qualifier (“lead,” “equal” or “supporting”). For humanities and social science submissions where roles do not cleanly apply, the more transparent approach is to leave inapplicable roles unfilled and add a brief supplementary note rather than mislabel contributions to complete the form.

    Implications for research administrators and publishers

    For research offices and publishers serving mixed STEM/HSS portfolios, the practical implication is that a single CRediT template cannot be applied uniformly across disciplines without editorial guidance. Journals in library science, digital humanities and area studies have already begun documenting where the taxonomy strains, and that evidence base — not a wholesale rejection of contributor-role systems — is the right foundation for discipline-sensitive guidance.

    The taxonomy’s own governance structure supports this kind of refinement: NISO’s ANSI/NISO Z39.104-2022 standard is maintained through open, community-based revision, meaning discipline-specific extension proposals have a legitimate path forward rather than requiring a competing standard. Institutions adopting CRediT contributor roles for mixed-discipline outputs, and those documenting broader authorship practice, should treat the STEM origin of these 14 roles as a known constraint to design around, not a hidden defect to discover after the fact.

  • Credit Authorship Taxonomy: The Preprint Gap

    The credit authorship taxonomy (CRediT) is largely absent from arXiv and bioRxiv preprints because neither platform has an editorial office empowered to enforce it, neither offers a dedicated contribution-metadata field, and a preprint is not yet a fixed version of record. CRediT statements are collected later, when a manuscript reaches a journal that mandates them.

    CRediT is a controlled vocabulary of 14 defined contributor roles used to describe, role by role, what each named author actually did on a research output. CASRAI originated the CRediT contributor role taxonomy in 2014, and the standard is now stewarded by NISO as ANSI/NISO Z39.104-2022.

    Contents

    What Is the CRediT Authorship Taxonomy?

    CRediT (Contributor Roles Taxonomy) assigns one or more of 14 standard role labels — Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, and Writing – review & editing — to each named contributor on a research output.

    • CASRAI originated the taxonomy in 2014 to complement, not replace, traditional authorship bylines.
    • NISO approved it as ANSI/NISO Z39.104-2022, the current formal reference standard.
    • It is licensed CC-BY 4.0 and is distinct from the ICMJE authorship criteria, which govern who qualifies as an author at all rather than what each author contributed.

    The taxonomy is now embedded in the submission systems of major publishers, including Elsevier, Wiley, Taylor & Francis, Sage and Nature Portfolio journals — almost always at the point of formal peer-reviewed submission or acceptance, not at the preprint stage.

    Why Don’t arXiv and bioRxiv Require CRediT Statements?

    Preprint servers skip CRediT largely because they have no editorial office analogous to a journal’s. arXiv and bioRxiv operate a lightweight moderation or screening check — confirming the submission is on-topic and not obviously unscientific — rather than the editorial and peer-review workflow that gives journals a natural checkpoint at which to demand a structured contributorship disclosure.

    A second reason is version-of-record ambiguity. A preprint can be revised multiple times before, or instead of, formal publication, and co-authorship or individual roles can change between versions — for example when a reviewer at the eventual journal requests new experiments performed by a newly added contributor. Locking a CRediT statement to an early preprint version risks misrepresenting the contributions behind the paper that ultimately gets cited.

    Neither arXiv nor bioRxiv has published an official policy explaining the omission; the absence reflects infrastructure and governance gaps rather than a stated objection to the taxonomy itself.

    The Submission and Metadata Gap Behind the Absence

    The practical blocker is metadata architecture. arXiv collects author information as a single free-text field with no dedicated structure for role-level contribution data. bioRxiv and medRxiv, run by Cold Spring Harbor Laboratory, capture somewhat richer structured metadata — including funder information — but likewise have no CRediT field in their submission forms.

    This differs from what happens downstream. Crossref’s deposit schema supports embedding CRediT contributor-role metadata against a published journal article’s DOI record, which is how a reader can eventually see machine-readable contribution data attached to the version of record. Preprint DOI records typically carry no equivalent CRediT element, because the preprint servers do not populate it and have no requirement to.

    Feature arXiv / bioRxiv (preprint) Typical CRediT-mandating journal
    Screening body Moderators (topic/scope check) Editorial board + peer reviewers
    Author metadata field Free-text author list Structured CRediT role fields in submission system
    Version status Multiple revisable versions Single accepted version of record
    CRediT statement required No Often yes, per publisher policy
    DOI metadata (CRediT roles) Generally absent Supported via Crossref deposit schema

    What Changes When a Preprint Reaches a CRediT-Mandating Journal?

    Once a manuscript that began life as an arXiv or bioRxiv preprint is accepted by a journal that mandates CRediT, the contribution statement is captured during that journal’s own submission or production workflow — not retrofitted onto the preprint record itself.

    Authors typically complete role selections in the publisher’s manuscript system (for example, at revision or acceptance stage), and the resulting statement appears on the published article page and, where supported, in the article’s Crossref-deposited metadata. bioRxiv and medRxiv link out to the published version once available, but the CRediT statement itself lives with the publisher’s version of record, not the earlier preprint.

    Answer-First Q&A

    What is the CRediT taxonomy?

    The CRediT taxonomy is a standardised, 14-role controlled vocabulary — covering roles such as Conceptualization, Investigation, and Writing – original draft — used to describe each named author’s specific contribution to a research output, distinct from authorship order or byline position.

    What are the 14 roles of the CRediT taxonomy?

    The 14 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, as defined under ANSI/NISO Z39.104-2022.

    Do preprints need a CRediT statement?

    No. Neither arXiv nor bioRxiv currently requires a CRediT statement, since neither maintains the editorial enforcement mechanism or the structured metadata field that journals use to collect this information at submission or acceptance.

    What happens to author contributions when a preprint is later published?

    The CRediT statement is generated at the journal stage, through the publisher’s own submission system, and appears on the published version of record — it is not added retroactively to the original preprint page on arXiv or bioRxiv.

    Implications for Research Administrators and Institutions

    Institutions relying on contributorship data for research assessment, promotion cases, or authorship-dispute resolution should treat preprints as an incomplete contributorship record. The Contributor Roles Taxonomy resource maintained at CASRAI’s CRediT contributor roles hub and CASRAI’s broader authorship guidance both point research offices toward the published, CRediT-tagged version rather than the preprint when contributorship needs to be verified or cited formally.

    • Do not assume a preprint’s author order reflects final contribution roles — roles can shift before formal publication.
    • Check the journal’s published version, and its Crossref metadata where available, for the authoritative CRediT statement.
    • Use CASRAI’s research administration dictionary to confirm terminology when drafting institutional authorship policy.

    Outlook: Will Preprint Servers Adopt CRediT?

    Momentum toward richer preprint metadata is real but has so far concentrated on discoverability and version-linking rather than contributorship. Until arXiv or bioRxiv add a structured contribution field, and until a body with editorial standing is prepared to enforce it, CRediT statements will remain a journal-stage artefact rather than a preprint-stage one. Research offices and funders that want contributor-level accountability earlier in the research lifecycle will need to look to journal policy, not preprint infrastructure, for now.

  • CRediT Taxonomy Form: From Submission Checkbox to Crossref Metadata

    The credit taxonomy form is the checkbox interface built into manuscript submission systems — such as Editorial Manager and ScholarOne — that lets a corresponding author assign one or more of the 14 CRediT contributor roles to each author. That selection is not just cosmetic: it is designed to travel, unchanged, from the submission form into the article’s JATS XML and, increasingly, into the DOI metadata that Crossref exposes to the wider scholarly record.

    CRediT (Contributor Roles Taxonomy) is a standardised, machine-readable vocabulary of 14 contribution types — such as Conceptualization, Data curation or Writing – original draft — used to describe what each author or contributor actually did, distinct from the separate question of who qualifies for authorship. CASRAI originated the CRediT contributor role taxonomy in 2014. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, with descriptors available in multiple languages.

    This article is written for developers, editorial-systems teams and publishing operations staff who need to understand the full pipeline — not just what CRediT means, but how a checkbox selection becomes a permanent, queryable metadata field.

    What is the CRediT taxonomy form?

    The CRediT taxonomy form is the structured data-entry step, embedded in a journal’s manuscript submission system, where the corresponding author declares each contributor’s role from a fixed list of 14 options. It is a controlled-vocabulary form, not free text — every selection maps to one of the standard CRediT terms, each with its own stable identifier at credit.niso.org.

    The 14 roles captured by the form are:

    • Conceptualization
    • Data curation
    • Formal analysis
    • Funding acquisition
    • Investigation
    • Methodology
    • Project administration
    • Resources
    • Software
    • Supervision
    • Validation
    • Visualization
    • Writing – original draft
    • Writing – review & editing

    A contributor can hold more than one role, and a single role can be assigned to more than one contributor. Some submission systems also let authors record a degree of contribution — lead, equal or supporting — but this qualifier is optional and is not currently part of the CRediT standard itself; individual publishers decide whether to collect it.

    How manuscript systems capture the form at submission

    CRediT capture happens earliest in the pipeline, at manuscript submission, before peer review begins. Aries Systems’ Editorial Manager has supported CRediT since 2016 and Clarivate’s ScholarOne Manuscripts since 2018 — the two dominant commercial manuscript submission systems (MSSs) used across most major publishers. Open Journal Systems (OJS), the leading open-source platform, offers CRediT as a plugin.

    Manuscript system Vendor CRediT support since Integration type
    Editorial Manager Aries Systems 2016 Native checkbox form
    ScholarOne Manuscripts Clarivate 2018 Native checkbox form
    Open Journal Systems (OJS) Public Knowledge Project Community plugin Open-source plugin

    During submission, the corresponding author works through the contributor list and ticks the applicable CRediT roles for each name. The system typically requires this step to be completed, or at least reviewed, before the manuscript can proceed to the editor. Best practice — reflected in NISO’s implementation guidance — is for all named authors to review and confirm the roles assigned to them before the form is finalised, reducing later disputes over credit.

    How CRediT roles are encoded in JATS XML

    Once accepted, the article moves into production, where the checkbox selections are converted into JATS XML (Journal Article Tag Suite) — the NISO standard (ANSI/NISO Z39.96) used to structure scholarly article content and metadata for archiving, indexing and reuse. This is the step that turns a form selection into genuinely machine-readable data rather than just display text on the published page.

    The JATS4R (JATS for Reuse) working group, in a recommendation published 13 September 2021 and current at version 1.2, specifies exactly how CRediT terms must be tagged inside the <role> element within <contrib-group>/<contrib>. Under JATS 1.2 and above, each role carries four attributes:

    • @vocab — must always carry the value “credit”
    • @vocab-identifier — must point to https://credit.niso.org/
    • @vocab-term — must identify the specific CRediT term (e.g. “Conceptualization”)
    • @vocab-term-identifier — must point to the URL of that specific term (e.g. https://credit.niso.org/contributor-roles/conceptualization/)

    Each CRediT term requires its own <role> element — where a contributor holds multiple roles, the element is repeated rather than combined. JATS4R also provides a validator tool that flags mismatches, such as a role term with no corresponding @vocab="credit" attribute. Publishers still using the older JATS 1.1 DTD can tag CRediT terms using the @content-type attribute instead, though JATS4R recommends migrating to 1.2 for more robust support.

    How CRediT metadata reaches Crossref and the DOI record

    The final leg of the pipeline is deposit with Crossref, the DOI registration agency that most scholarly publishers use to register article identifiers and metadata. Per Crossref’s published strategy roadmap, Crossref is working on metadata ingest schema v.5.5 to add native support for the CRediT taxonomy of contributor roles — meaning the same structured role data captured in JATS XML can be deposited directly against the article’s DOI record.

    Once that ingest path is live, CRediT information becomes queryable through Crossref’s public APIs rather than sitting only inside a publisher’s own XML or HTML. That has knock-on value for research information systems, ORCID contribution records and institutional CRIS platforms, all of which can pull structured contribution data by DOI instead of scraping an “Author Contributions” paragraph from the rendered article page.

    Note that CRediT is explicitly not designed to determine authorship. ICMJE’s authorship criteria and COPE’s guidance on authorship disputes remain the governing frameworks for who qualifies as an author; CRediT — and the form that captures it — only describes what each named contributor did.

    Frequently asked questions

    What is the CRediT taxonomy?

    CRediT is a standardised system of 14 roles for describing individual contributions to a research output. When an author submits to a publisher using CRediT, the submission form asks them to select the applicable roles for each contributor, rather than relying on free-text acknowledgements.

    What are the 14 roles of the CRediT taxonomy?

    The 14 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 — each with a stable identifier at credit.niso.org.

    How do I CRediT someone in a research paper?

    Agree contributor roles with co-authors before submission, then use the journal’s CRediT taxonomy form to assign one or more of the 14 roles to each name. Where a journal has no integrated form, contributions can be listed manually in an author contribution statement or acknowledgement section.

    Implications for publishers and developers

    For manuscript-system developers, the practical requirement is straightforward but easy to get wrong: the checkbox output must map one-to-one onto the JATS4R attribute set, not a locally invented tag scheme, or the resulting XML will fail JATS4R validation and lose machine-readability further down the chain. For publishing operations teams, the Crossref v.5.5 schema update is the point at which CRediT stops being a publisher-side display feature and becomes part of the permanent scholarly record attached to the DOI itself.

    Institutions and funders tracking research contribution data — for hiring, promotion or grant-reporting purposes — should treat Crossref-deposited CRediT metadata, once available, as a more reliable source than scraping “Author Contributions” text from HTML pages, since the underlying <role> tagging is what the form was designed to produce in the first place.

    What happens next

    As Crossref’s schema v.5.5 rolls out, expect wider adoption of CRediT deposit among publishers that have not yet enabled it, and closer scrutiny from JATS4R’s validator tooling as more XML pipelines attempt to encode CRediT roles at scale. The direction of travel is consistent: from a checkbox on a submission form, through a standard XML attribute set, to a queryable field on a permanent DOI record. Developers building or auditing manuscript-system integrations should treat the CRediT taxonomy and its individual contributor roles as the canonical reference points, alongside the broader question of how contribution data relates to authorship criteria.

  • 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 Frontiers Guide: What Open Peer Review Changes

    An author contribution statement for Frontiers is a mandatory, standardised disclosure — built on the CRediT taxonomy — that names each author’s initials against specific research tasks, placed just before the references. Because Frontiers also operates a collaborative, open peer review model in which reviewer identities are published alongside the article, that statement sits inside a visibly transparent record rather than behind a closed editorial process, raising the stakes for accuracy and completeness compared with journals that keep review closed.

    The Contributor Roles Taxonomy (CRediT) is a structured set of 14 standardised labels — from Conceptualization to Writing – Review & Editing — used to describe what each named author actually did on a manuscript, replacing vague free-text authorship blurbs with a checkable, comparable record.

    What does Frontiers require in an author contribution statement?

    Frontiers’ author guidelines make the Author Contributions Statement mandatory for every submission across its journal portfolio, including titles operated under Frontiers Partnerships. The statement must represent all named authors, briefly describe individual tasks, and identify each person by initials rather than full names — with a middle initial added where two authors share the same first and last initials (for example, REW and RSW).

    Practically, the submitting author enters each co-author’s contributions during the online submission process, and the system compiles them into the final statement, which is placed at the end of the manuscript, immediately before the References section. This mirrors the broader shift documented by publishers such as Elsevier and Wiley toward structured, submission-system-driven contribution capture rather than a free-text paragraph drafted after the fact.

    Frontiers’ authorship threshold is explicitly anchored to the International Committee of Medical Journal Editors (ICMJE) criteria: substantial contribution to conception or design, data acquisition, analysis or interpretation; drafting or critically revising the work; final approval of the version to be published; and agreement to be accountable for all aspects of the work. A CRediT-tagged contribution statement does not replace this authorship test — it documents what qualifying authors did, once they already qualify.

    What is CRediT, and where did it come from?

    CASRAI originated the CRediT contributor role taxonomy in 2014, in collaboration with journal publishers and research funders seeking a shared vocabulary for describing authorship work. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, which is the current authoritative specification of the 14 roles and their definitions.

    Frontiers announced its adoption of CRediT on 20 July 2023, stating that the system “replaces the conventional free-text authorship descriptions with a standardized and transparent system that ensures consistency and accuracy in recognizing individual contributions.” Frontiers’ chief executive editor, Dr Frederick Fenter, framed the move as part of a wider commitment to openness within scholarly publishing.

    • Conceptualization
    • Data Curation
    • Formal Analysis
    • Funding Acquisition
    • Investigation
    • Methodology
    • Project Administration
    • Resources
    • Software
    • Supervision
    • Validation
    • Visualization
    • Writing – Original Draft
    • Writing – Review & Editing

    Each role can be assigned to more than one author, and a single author can hold multiple roles — the taxonomy is designed to reflect real research teams, where contributions overlap rather than divide neatly by job title.

    How does Frontiers’ open peer review model change the stakes?

    Frontiers runs a collaborative review process in which reviewers interact directly with authors during revision and reviewer names are published on the final article. That design choice matters for contribution statements: in a closed-review journal, an inaccurate or vague CRediT statement is checked, at most, by an anonymous editor and reviewers whose identities never surface. At Frontiers, the same statement sits on a page where the reviewers who scrutinised the work are named too, creating a fuller, mutually visible accountability chain from idea to publication.

    This does not mean reviewers audit CRediT tags line by line — Frontiers’ policy places that responsibility on the corresponding author — but it does mean the entire provenance record (who contributed what, and who reviewed it) is public and durable rather than partially hidden. For research integrity investigations, that visibility is a practical asset: a named reviewer trail alongside a role-based authorship record narrows the anonymity gap that closed models leave open.

    Feature Traditional closed peer review Frontiers’ collaborative open review
    Reviewer identity Anonymous to readers (and often to authors) Published with the article
    Author contribution statement Visible to readers, but reviewed only by an anonymous editor Visible to readers alongside named reviewers who assessed the work
    Post-publication scrutiny Contribution disputes are harder to trace to a specific review stage Named reviewer record supports faster provenance checks
    Incentive for precision Lower — statement rarely cross-checked publicly Higher — statement sits next to a public, named review record

    For research administrators advising on authorship disputes, this distinction is worth flagging explicitly: a Frontiers submission carries more public accountability infrastructure around a contribution statement than an equivalent closed-review journal, even though the CRediT taxonomy itself is identical across both.

    What does a compliant example look like?

    A CRediT-based Frontiers statement is typically compact — a handful of sentences, not a paragraph — and uses initials throughout. A representative, compliant format:

    “AB: Conceptualization, Methodology, Writing – Original Draft. CD: Investigation, Formal Analysis, Visualization. EF: Data Curation, Software. GH: Supervision, Funding Acquisition. All authors contributed to the article and approved the submitted version.”

    Three points distinguish a compliant statement from a weak one:

    • Every named author appears at least once — omitting a listed author from the statement is a common submission-checklist rejection reason.
    • Roles are drawn from the 14 standard CRediT labels, not invented descriptions (“helped with the project” is not a CRediT role).
    • The closing sentence confirming collective approval is retained, satisfying the ICMJE’s fourth authorship criterion on accountability.

    Common questions

    What is a contribution statement example?

    A contribution statement example lists each author’s initials against specific CRediT roles, such as “AB: Conceptualization, Writing – Original Draft.” It is a short, structured disclosure — typically two to five sentences — not a narrative account, and it appears at the end of the manuscript before the references.

    How do I write an author contribution statement?

    Assign each named author one or more of the 14 CRediT roles based on what they actually did, list contributions by initials, and add a closing line confirming all authors approved the submitted version. Frontiers’ online submission system compiles these entries automatically once authors provide them.

    Do you have to pay to publish in Frontiers?

    Yes — Frontiers is a gold open-access publisher and charges an article processing charge (APC) only after acceptance; no fee applies to rejected or withdrawn submissions. This fee transparency sits alongside the same openness principle that drives Frontiers’ published reviewer names and public contribution statements.

    Implications for authors and institutions

    Research offices advising authors on Frontiers submissions should treat the contribution statement as a document with two audiences at once: the editorial system checking ICMJE compliance, and a permanent public record sitting next to named reviewers. According to Frontiers Media’s own reporting on the Norwegian Scientific Index (NSD), 96 of its journals were listed in that register as of 2022 — a scale of output where standardised, auditable contribution data materially reduces the administrative burden of resolving authorship disputes after publication.

    Institutions building CRediT literacy into researcher training should note that the taxonomy’s value compounds under open models: a precise, role-based statement becomes machine-readable metadata that can feed ORCID records, funder reporting, and institutional repositories, not just a line in a PDF.

    Where this is heading

    As more publishers combine structured contributorship data with visible review provenance, the author contribution statement stops being a compliance formality and becomes part of a public integrity record. Frontiers’ pairing of mandatory CRediT statements with named, published reviewers is one live example of that shift — and a template other open-review adopters are likely to follow as funders and institutions push for fuller contributorship transparency.

    For the full 14-role reference and role definitions, see the CRediT taxonomy overview and the individual CRediT role pages. For the underlying authorship criteria that a contribution statement documents, see CASRAI’s authorship guidance.

  • CRediT Taxonomy at PLOS ONE: Mandatory Roles

    PLOS ONE does not accept a free-text paragraph of author contributions. Since adopting the CRediT taxonomy, the journal requires every author to be assigned one or more of 14 standardised, machine-readable contributor roles at submission, and those role tags are published with the article. This structured, mandatory model sits in contrast to journals that still rely on a narrative “author contributions” statement, and it is why PLOS ONE is now a reference case for what machine-readable authorship metadata looks like in practice.

    The credit taxonomy plos one implementation is one of the clearest examples of a publisher moving contributor-role reporting from prose to structured data. CRediT (Contributor Roles Taxonomy) is a fixed set of 14 role labels — such as Conceptualization, Data Curation, Formal Analysis and Writing – Original Draft Preparation — used to tag, rather than narrate, what each named author actually did on a research output.

    What is the CRediT taxonomy?

    CASRAI originated the CRediT contributor role taxonomy in 2014 as a way to replace vague authorship credit with a fixed, shared vocabulary. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, which formally defines the 14 roles and their scope.

    Each role describes a discrete type of research labour — not seniority, not authorship order, and not a value judgement on contribution size. A single author can hold several roles; a single role can be shared by several authors. The taxonomy is designed to be tagged against a person, ideally via an ORCID iD, so that contribution data can be indexed, aggregated and machine-read rather than only read as prose.

    • Conceptualization
    • Data Curation
    • Formal Analysis
    • Funding Acquisition
    • Investigation
    • Methodology
    • Project Administration
    • Resources
    • Software
    • Supervision
    • Validation
    • Visualization
    • Writing – Original Draft Preparation
    • Writing – Review & Editing

    How did PLOS ONE make CRediT mandatory and machine-readable?

    PLOS states plainly on its authorship policy page that it “has adopted the CRediT Taxonomy to describe each author’s individual contributions to the work,” and that the submitting author is responsible for entering every author’s contributions at the point of submission. This is not an optional supplementary note — it is a required submission field, checked before peer review can proceed.

    Because the roles are selected from a closed list rather than typed freely, the resulting metadata is structured at source. PLOS publishes the completed role set with the final article as tagged data, which downstream systems, indexers and bibliometric researchers can parse without needing to interpret prose. PLOS pairs this with a mandatory ORCID iD for the corresponding author, linking machine-readable roles to a persistent researcher identifier rather than a name string alone.

    This mandatory-and-structured model is precisely what distinguishes PLOS ONE’s approach from journals that reference CRediT only as a recommended framework for a free-text “author contributions” paragraph.

    CRediT vs free-text contribution statements: what changes?

    Free-text contribution statements ask authors to describe their roles in a sentence or short paragraph, with no controlled vocabulary. The result is legible to a human reader but effectively opaque to software, and inconsistent from one journal — even one article — to the next.

    Feature PLOS ONE: mandatory CRediT tagging Free-text contribution statement
    Vocabulary Closed set of 14 defined roles (ANSI/NISO Z39.104-2022) Open, author-written prose
    Machine readability Structured, taggable per author Requires manual or NLP interpretation
    Consistency across articles Uniform role labels journal-wide Wording varies by author and article
    Submission requirement Mandatory field at Editorial Manager submission Often optional or loosely enforced
    Bibliometric usability Enables large-scale contribution analysis Poorly suited to aggregation

    The practical effect is that a mandatory, tagged taxonomy turns “who did what” into queryable data, while a free-text statement remains a one-off narrative disclosure that satisfies transparency norms without generating reusable metadata.

    What does the evidence show about CRediT data in practice?

    Because PLOS ONE’s CRediT tags are structured and published at scale, they have become a dataset in their own right. Ding et al. (2021), writing in Scientometrics, used PLOS ONE’s tagged contributor roles to build and evaluate a co-author credit-allocation method — work that would not have been possible against free-text statements alone.

    Separately, Larivière and colleagues analysed division of labour in biomedical research using CRediT-tagged data, a study now cited more than 135 times, underscoring how structured role data has become a recognised input for research-on-research and responsible-assessment work. Nature’s 2025 retrospective on the taxonomy’s first decade likewise frames CRediT’s core value as enabling “trust, integrity and responsible research assessment” — a claim that depends on contribution data being structured enough to analyse, not merely readable.

    • CASRAI originated CRediT in 2014; NISO now stewards it as ANSI/NISO Z39.104-2022.
    • PLOS requires CRediT role assignment as a mandatory submission field, not an optional note.
    • Ding et al. (2021, Scientometrics) built a credit-allocation model directly from PLOS ONE’s CRediT tags.
    • Larivière et al.’s CRediT-based division-of-labour study has been cited over 135 times.

    Answer-first Q&A

    What is the CRediT taxonomy?

    The CRediT taxonomy is a standardised system of 14 roles for describing what each author contributed to a research output. CASRAI originated it in 2014; it is now formally stewarded by NISO as ANSI/NISO Z39.104-2022. Journals that adopt it ask authors to select applicable roles rather than write free prose.

    What are the 14 roles in the CRediT taxonomy?

    The 14 roles are Conceptualization, Data Curation, Formal Analysis, Funding Acquisition, Investigation, Methodology, Project Administration, Resources, Software, Supervision, Validation, Visualization, Writing – Original Draft Preparation and Writing – Review & Editing. Authors can hold multiple roles, and roles can be shared across a byline.

    Is PLOS ONE a credible journal?

    PLOS ONE is a fully peer-reviewed, indexed journal published by the non-profit Public Library of Science. Its mandatory, structured CRediT and ORCID requirements are part of a broader editorial-integrity framework that includes ICMJE-aligned authorship criteria and COPE-based authorship-dispute handling.

    Is it good to publish in PLOS ONE?

    For authors who want transparent, machine-readable contribution records, publishing in PLOS ONE means every co-author’s role is captured in structured form and published alongside the article — a stronger provenance record than a narrative statement, though editorial fit and scope should still guide the submission decision.

    Implications and what comes next

    For research administrators and institutions, PLOS ONE’s model is a working template for what “compliance-ready” contributorship metadata looks like: mandatory at submission, tied to ORCID, and published as structured data rather than prose. Funders and institutions assessing individual contribution to collaborative outputs gain a queryable record instead of having to parse inconsistent narrative statements.

    For publishers still using an optional or free-text model, the PLOS ONE case demonstrates that a mandatory, role-based submission field is operationally achievable at very high volume — PLOS ONE has published hundreds of thousands of articles under this requirement. As more journals move toward structured contributorship, the gap between “CRediT as a suggested framework” and “CRediT as an enforced, machine-readable field” is likely to become the more meaningful dividing line in authorship transparency than whether a journal mentions CRediT at all.

    Research administrators evaluating a journal’s authorship rigour should check not just whether CRediT is referenced in author guidelines, but whether role assignment is enforced as structured, mandatory metadata — the distinction this case study sets out to make clear.

  • CRediT Taxonomy Under NISO: Inside Z39.104-2022

    The CRediT taxonomy is governed today by the National Information Standards Organization (NISO), not by the group that originally designed it. Formal stewardship sits with the credit taxonomy niso standard, ANSI/NISO Z39.104-2022, whose maintenance runs through a NISO CRediT Standing Committee that reviews proposed changes and coordinates revisions to the published standard.

    ANSI/NISO Z39.104-2022 is the American National Standard that formalises the Contributor Roles Taxonomy (CRediT) — a controlled vocabulary of 14 contributor roles used by scholarly journals to describe individual research contributions, approved by ANSI on 14 January 2022 and published by NISO on 8 February 2022.

    CASRAI originated the CRediT contributor role taxonomy in 2014. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022. Understanding where CASRAI’s design work ends and NISO’s formal governance begins matters for any publisher, institution, or developer deciding how to submit a correction, propose a new role, or cite the standard accurately.

    Who stewards the CRediT taxonomy today?

    NISO stewards the CRediT taxonomy through ANSI/NISO Z39.104-2022, a standard approved by the American National Standards Institute and published by NISO. Stewardship is distinct from origination: CASRAI and a cross-institutional pilot group designed the original taxonomy, but formal, ongoing governance now belongs to NISO’s standards infrastructure.

    This distinction is not a technicality. It determines who has authority to add, deprecate, or clarify a contributor role, and it is why publishers citing the standard should reference ANSI/NISO Z39.104-2022 rather than an unversioned “CRediT taxonomy” with no governing body attached.

    Aspect CASRAI’s original design work NISO’s formal stewardship
    Period 2012 pilot through 2015 launch 2020 work item to present
    Origin event 2012 Wellcome Trust / Harvard University workshop with ICMJE-affiliated biomedical journal editors 2020 NISO work item to register CRediT as an ANSI/NISO standard
    Governing body CASRAI-convened pilot group NISO CRediT Standing Committee
    Formal designation None — informal taxonomy ANSI/NISO Z39.104-2022
    Licence Open, community use CC-BY 4.0, per credit.niso.org
    Change authority Original design team NISO Standing Committee via ANSI balloting

    How is the Z39.104 working group structured?

    The NISO working group that produced Z39.104-2022 was deliberately cross-sector, drawing named representatives from publishers, funders, universities, and research-consulting firms rather than a single stakeholder type. That composition is itself a governance signal: no one sector controls the standard.

    Publicly listed contributors to the NISO work item included representatives from PLOS, Oxford University Press, Taylor & Francis Group, IOP Publishing, UK Research and Innovation (UKRI), Northwestern University, Université de Montréal, Carnegie Mellon University, and the Mathematical Association of America, alongside independent research consultants.

    • Publishers — PLOS, Oxford University Press, Taylor & Francis, IOP Publishing, the Mathematical Association of America
    • Funders — UK Research and Innovation (UKRI)
    • Universities — Northwestern University, Université de Montréal, Carnegie Mellon University
    • Independent consultants — Research Consulting Limited and Kerridge Research Consulting

    Once ANSI approval completed in January 2022, this working group’s role transitioned into the standing NISO CRediT Standing Committee, which now provides the ongoing forum for feedback, implementation support, and future expansion of the taxonomy into subject areas beyond its original biomedical-publishing roots.

    What is the revision cadence for the standard?

    ANSI/NISO Z39.104-2022 does not operate on a fixed annual revision schedule. Instead, it follows NISO’s continuous-maintenance model: proposed changes can be submitted at any time, but they are only incorporated into a new dated version of the standard after the Standing Committee reviews them and, where warranted, NISO runs the change through formal ANSI balloting.

    Three dates anchor the standard’s history so far:

    • 2020 — NISO launches the work item to formalise CRediT as an ANSI/NISO standard, with a small working group focused on the existing 14 roles.
    • 14 January 2022 — ANSI approves the standard.
    • 8 February 2022 — NISO publishes ANSI/NISO Z39.104-2022.

    No subsequent dated revision has been published since 2022; proposed extensions — such as recognising acknowledged (non-authorship) contributions or peer-review credit — are discussed through the Standing Committee and the associated CRediT Community of Interest before any future ballot.

    How do publishers submit change requests?

    Publishers, institutions, and individual researchers can raise a proposed change to the taxonomy at any time; the request is then triaged by the NISO CRediT Standing Committee rather than acted on unilaterally by any single publisher.

    1. Draft the request in writing, specifying the exact role, definition, or scope change proposed and the use case it addresses.
    2. Route it to NISO for referral to the Standing Committee, including your name, affiliation, and contact details.
    3. Await committee review — the Standing Committee discusses submissions as part of its regular meetings and decides whether to advance them.
    4. Formal balloting — if the committee approves a substantive change, NISO carries it through ANSI’s standards-approval process before it appears in a revised, dated version of Z39.104.

    This is why individual publishers — Sage among them — note on their own author-guidance pages that not every journal has adopted CRediT yet, and direct queries to dedicated editorial mailboxes rather than to NISO directly: implementation decisions sit with each publisher, while the taxonomy itself sits with NISO.

    For institutions building internal guidance, CASRAI’s CRediT contributor roles hub and the individual CRediT role pages summarise the 14 roles for practical reference, alongside broader context in CASRAI’s authorship resources.

    Common questions about CRediT taxonomy governance

    What is the CRediT taxonomy?

    CRediT (Contributor Roles Taxonomy) is a controlled vocabulary of 14 contributor roles used to describe the specific contributions individuals make to a research output, distinct from a simple author byline. It has been in widespread scholarly-publishing use since 2015 and was formalised as ANSI/NISO Z39.104-2022 in 2022.

    What are the 14 roles of CRediT taxonomy?

    The 14 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. Each role can be attributed to more than one contributor, and each contributor can hold more than one role.

    Does every publisher use the same CRediT taxonomy?

    No. The taxonomy itself is standardised under ANSI/NISO Z39.104-2022, but adoption is uneven: some journals, including certain Sage titles, have not yet implemented CRediT statements at all. Standardisation of the vocabulary does not guarantee uniform implementation across every journal or publisher.

    The practical implication for research administrators is that citing “the CRediT taxonomy” without a version reference is no longer precise enough for policy documents, institutional repositories, or funder-reporting templates. ANSI/NISO Z39.104-2022 is the citable, versioned artefact; CASRAI’s 2014 design work is the historical origin, not the current governing document. As the Standing Committee’s remit expands toward acknowledged contributions and peer-review credit, expect the next dated revision to widen the taxonomy’s scope beyond its original 14 roles rather than replace them.

  • CASRAI CRediT Taxonomy: From 2014 to NISO

    The CASRAI CRediT taxonomy is a controlled vocabulary of 14 contributor roles that CASRAI originated in 2014 to replace ambiguous author bylines with a standardised record of who did what on a research output. CASRAI’s working group refined and launched the taxonomy in 2015; in 2022 it was transferred into formal governance under NISO as ANSI/NISO Z39.104-2022. CASRAI originated the standard — NISO now stewards it.

    CRediT (Contributor Roles Taxonomy) is a free, CC-BY-licensed classification scheme of 14 discrete contribution types — from Conceptualization and Formal analysis to Writing and Funding acquisition — used by journals and institutions to document individual research contributions alongside, or instead of, a traditional author list.

    What is the CASRAI CRediT taxonomy?

    CRediT defines 14 non-hierarchical 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. A contributor can hold multiple roles, and not every role applies to every project.

    Each role carries a unique, machine-readable identifier so it can be embedded in JATS XML, JSON-LD, and schema.org metadata. This structured layer is what allows CRediT statements — not just prose acknowledgements — to be indexed, aggregated, and queried by discovery tools such as CrossRef and ORCID-linked systems.

    • Conceptualization, Methodology, Software — planning and design roles
    • Validation, Formal analysis, Investigation, Resources, Data curation — research and analysis roles
    • Writing – original draft, Writing – review & editing, Visualization — communication roles
    • Supervision, Project administration, Funding acquisition — management roles

    How did CASRAI originate CRediT, 2012–2015?

    The idea of replacing author bylines with itemised contributions predates CRediT itself, but the modern taxonomy began at a 2012 workshop co-hosted by Harvard University and the Wellcome Trust, where researchers, publishers, and funders sketched a draft list of contribution types. That draft was described in the scholarly literature the same year and refined through 2014.

    In 2014, CASRAI (the Consortia Advancing Standards in Research Administration Information) took leadership of the initiative, convening a working group of publishers, funders, and university representatives to formalise the vocabulary. The result was documented in Nature in April 2014 (“Publishing: Credit where credit is due”, Allen, Scott, Brand, Hlava & Altman) and, a year later, in Learned Publishing (“Beyond authorship: attribution, contribution, collaboration, and credit”, 2015).

    CASRAI formally launched CRediT on its own site in October 2015, and spent the following years promoting adoption among publishers and research organisations. By 2017, PLOS and eLife had both implemented CRediT; in 2018 it was endorsed by representatives of the US National Academy of Sciences, and adoption by major publishers — Wiley, Elsevier, Sage, Frontiers — followed through the late 2010s.

    How did CRediT become ANSI/NISO Z39.104-2022?

    Interest in formalising CRediT accelerated in 2020, when grant funding from the Wellcome Trust and the Alfred P. Sloan Foundation supported a project to expand its use and move it toward a standards body with a permanent maintenance process. That project produced a dedicated site at credit.niso.org, launched in 2020 under NISO’s stewardship.

    The formal outcome arrived in February 2022, when the National Information Standards Organization published the taxonomy as an American National Standard: ANSI/NISO Z39.104-2022, CRediT, Contributor Roles Taxonomy. The standard specifies the 14 roles, an optional degree-of-contribution indicator (“lead”, “equal”, or “supporting”), and machine-readable schemas for XML, JSON, JSON-LD, and schema.org integration.

    Ongoing maintenance now sits with the NISO CRediT Standing Committee, which reviews community feedback, supports implementation guidance, and considers future revisions. This is the single fact that matters most for citation accuracy: CRediT is not a CASRAI product today — it is an ANSI-accredited standard maintained by NISO, built on a taxonomy CASRAI originated and incubated between 2014 and roughly 2020.

    What changed in governance from CASRAI to NISO?

    The table below sets out the practical differences between the CASRAI-led incubation phase and the current NISO-governed standard.

    Attribute 2014–2020 (CASRAI-led) 2022–present (NISO-governed)
    Formal status Community taxonomy, no accredited standard ANSI/NISO Z39.104-2022, an American National Standard
    Governing body CASRAI working group NISO CRediT Standing Committee
    Primary site casrai.org/credit credit.niso.org
    Licence Open, publisher-adopted informally CC-BY 4.0, formally published
    Maintenance process Ad hoc working-group revisions Standing committee review cycle

    CASRAI’s role is historical and originating, not custodial. Wikipedia’s own entry on the taxonomy reflects this: CASRAI “took leadership” from 2014, and the standard “became an ANSI/NISO standard” in 2022 — two separate, sequential facts that should never be collapsed into a present-tense claim of CASRAI ownership.

    Answer-first Q&A

    Who created the CRediT taxonomy?

    A draft emerged from a 2012 Harvard–Wellcome Trust workshop. CASRAI then took leadership in 2014, convening the working group that formalised and launched the 14-role taxonomy in 2015. NISO subsequently took over formal governance in 2022 as an ANSI standard.

    Is CASRAI still involved with CRediT today?

    CASRAI originated CRediT but does not govern the current standard. Since 2022, maintenance sits with the NISO CRediT Standing Committee under ANSI/NISO Z39.104-2022. CASRAI continues to operate as a research-administration standards organisation and documents this originator role for citation accuracy.

    What is ANSI/NISO Z39.104-2022?

    It is the American National Standard that formally codifies the CRediT taxonomy, published by NISO in February 2022. It defines the 14 contributor roles, an optional degree-of-contribution field, and machine-readable XML, JSON, and JSON-LD schemas for publishing systems.

    How many CRediT contributor roles are there?

    Fourteen non-hierarchical roles, grouped informally into planning, research/analysis, communication, and management categories. Contributors may hold several roles simultaneously, and projects are not required to use every role — the taxonomy is descriptive, not a checklist requirement.

    What this means for institutions and publishers

    For research administrators, librarians, and publishers citing this history — for internal policy documents, Wikidata statements, or author-guideline pages — the operative distinction is originator versus owner. CASRAI’s 2014–2015 working group did the foundational design and promotion work that got CRediT adopted by major publishers before NISO existed as its steward. Citing “CASRAI’s CRediT taxonomy” in the present tense is now inaccurate; the correct present-tense reference is ANSI/NISO Z39.104-2022, with CASRAI credited as originator.

    This distinction also matters for reference accuracy more broadly: some third-party sources have mischaracterised CASRAI’s current operating status. CASRAI continues to function as a standards body in 2026, publishing governance-history material of exactly this kind so that citation networks — Wikipedia, Wikidata, institutional style guides — can be corrected with a dated, sourced timeline rather than an assumption.

    Institutions implementing CRediT should reference the current NISO standard for compliance purposes, while retaining the CASRAI-era history for provenance and attribution in policy documents. The individual CRediT role definitions and their relationship to broader authorship policy remain useful reference points for research offices building submission guidance.

    Looking ahead, the NISO CRediT Standing Committee’s review cycle is the channel through which future revisions — additional roles, clarified definitions, or expanded machine-readable schemas — will be considered. Any future change to the taxonomy will originate from that committee, not from CASRAI, which is the single fact this governance timeline exists to make citable.