CASRAI Dictionary

Tag: author contributions list

  • Author Contributions at Nature: Beyond CRediT

    Nature’s author contributions statement is a free-text paragraph, not a structured CRediT taxonomy submission. The flagship journal requires authors to describe, in their own words and by initials, what each co-author did — while sister journals such as Nature Communications require formal CRediT role tagging at submission. Authors moving between the two must translate manually.

    An author contributions statement is a short, published section of a paper — required by Nature since 1999 — that names each author’s specific role in the work, distinct from the author list itself.

    What Does Nature’s Author Contributions Statement Require?

    Nature has required a dedicated author contributions statement since 1999, when the journal first asked authors to say “who did what” in a short editorial note. The substance of the policy has barely changed since.

    Nature’s current formatting guide instructs: “Authors are required to include a statement to specify the contributions of each co-author. The statement can be up to several sentences long, describing the tasks of individual authors referred to by their initials.” The journal’s initial-submission guidance gives the template directly: “A.P.M. ‘contributed’ Y and Z; B.T.R. ‘contributed’ Y.”

    This means Nature accepts prose, not categories. There is no dropdown menu, no fixed list of roles, and no requirement to map each contribution onto a named taxonomy. Authors write a short paragraph, using initials rather than full names, describing who conceived the study, ran the experiments, analysed the data, wrote the manuscript, and supervised the work.

    The corresponding author is responsible for confirming that every co-author agrees with the statement before submission — a rule set out in Nature Portfolio’s wider authorship policy, adapted from the McNutt et al. framework published in Proceedings of the National Academy of Sciences in February 2018 (DOI: 10.1073/pnas.1715374115).

    How Does This Differ From the CRediT Taxonomy?

    The CRediT contributor roles taxonomy — 14 standardised roles from Conceptualization to Funding acquisition — was originated by CASRAI in 2014 and is now stewarded by NISO as ANSI/NISO Z39.104-2022. It requires authors to tag each contribution against a fixed, controlled list rather than write free prose.

    Nature’s free-text paragraph and CRediT are not the same instrument, and conflating them causes avoidable submission errors. Nature itself does not ask authors to select CRediT roles; Nature Communications, a separate journal in the same portfolio, does require CRediT role selection at submission.

    Feature Nature (flagship) Nature Communications CRediT-mandating journals generally
    Format Free-text paragraph Structured role selection Structured role selection
    Vocabulary Author’s own words, by initials 14 fixed CRediT roles 14 fixed CRediT roles
    Machine-readable? No Yes Yes
    Governing standard Nature editorial policy ANSI/NISO Z39.104-2022 ANSI/NISO Z39.104-2022

    A 2023 Nature Communications comment by Nakagawa et al., “Method Reporting with Initials for Transparency” (DOI: 10.1038/s41467-023-37039-1), argued that CRediT’s 14 categories, while useful for crediting intellectual roles, do not clearly capture who is accountable for specific methodological choices, and proposed an initials-based supplement closer to Nature’s original format. The tension between the two systems is therefore live within the Nature Portfolio itself, not only between competing publishers.

    How Do You Translate Between the Two Formats?

    Authors who already hold a CRediT-tagged contributions list — from a prior submission, an institutional record, or a preprint — can convert it into Nature’s free-text format directly. Each CRediT role maps onto a plain-English clause.

    • Conceptualization becomes “conceived the project” or “designed the study”.
    • Investigation / Formal analysis becomes “performed the experiments” or “analysed the data”.
    • Writing – original draft becomes “wrote the manuscript”; Writing – review & editing becomes “all authors commented on the manuscript”.
    • Supervision becomes “supervised the project”; Funding acquisition sits in Nature’s separate funding statement, not the contributions paragraph.
    • Resources, Data curation and Software fold into the relevant experimental or analytical clause rather than standing as separate categories.

    Working in the other direction — turning a Nature-style narrative into CRediT tags for a later submission to a CRediT-mandating journal — takes more judgement, because free text often bundles several CRediT roles into a single clause. Institutions preparing CRediT statements for repository or grant-reporting purposes should capture each author’s roles separately at the point contributions are agreed, rather than reverse-engineering roles from a published paragraph afterwards.

    Neither format determines who qualifies as an author. ICMJE’s authorship criteria — substantial contribution, drafting or critical revision, final approval, and accountability — remain the separate, higher bar that both Nature’s paragraph and CRediT tags sit underneath.

    Common Questions About Author Contributions

    What are examples of author contributions?

    A typical Nature-style example reads: “A.B. and C.D. designed the study; E.F. collected the data; A.B. analysed the results; A.B. and E.F. wrote the manuscript; all authors reviewed and approved the final version.” Each clause names a specific task, not a generic role label, and uses initials rather than full names.

    What is an author contribution in Springer Nature journals?

    Across the wider Springer Nature portfolio, an author contribution statement is a required declaration of responsibility published with the paper. Some portfolio journals, including Nature Communications, mandate formal CRediT role selection at submission; the flagship Nature journal instead accepts a free-text paragraph describing each author’s specific tasks.

    What are author contributions?

    Author contributions are the specific, individually attributable tasks — conception, experiments, analysis, writing, supervision — that each named author performed on a research output. They are distinct from authorship eligibility itself, which under ICMJE criteria also requires drafting or critical revision, final approval, and accountability for the work.

    What This Means for Authors and Institutions

    Research administrators supporting multi-journal submission pipelines should treat Nature’s paragraph and CRediT tagging as two outputs of one underlying contribution record, not two separate exercises repeated from scratch. Capturing contributions in structured CRediT form first — even for a Nature submission that will not display it — makes every subsequent translation faster and reduces disputes at revision stage.

    As more funders and repositories request machine-readable contributor data, the practical advantage sits with structured capture. CRediT, now governed as ANSI/NISO Z39.104-2022, is designed for that reuse; Nature’s narrative paragraph is not, and there is no indication the flagship journal plans to change that. Authors and institutions that standardise on CRediT internally, then export a narrative version for Nature submissions, avoid doing the attribution work twice.

  • 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.