The CRediT contributor roles taxonomy is a 14-role standardised vocabulary that names, precisely, what each person contributed to a research output — from Conceptualization and Investigation through to Writing – Original Draft and Supervision. For a PhD student assembling a first author contribution statement, the taxonomy replaces vague author-order conventions with an auditable, role-by-role record. Get it right and every collaborator, including your supervisor, is credited accurately; get it wrong — by over-claiming roles you did not perform, or omitting supervision entirely — and the statement can misrepresent the research record.
CASRAI originated the CRediT contributor role taxonomy in 2014. The standard is now stewarded by NISO as ANSI/NISO Z39.104-2022, and journals including Elsevier, Wiley and Taylor & Francis have required or offered CRediT statements since 2015. This guide is written for doctoral and early-career researchers who are completing their first CRediT statement and need to know, specifically, where first-time authors go wrong.
- What Is the CRediT Contributor Roles Taxonomy?
- The 14 CRediT Roles Explained for First-Time Authors
- The Most Common CRediT Mistakes First-Time Authors Make
- How to Write Your First CRediT Statement
- Common Questions First-Time Authors Ask About CRediT
What Is the CRediT Contributor Roles Taxonomy?
The CRediT contributor roles taxonomy is a controlled vocabulary of 14 defined roles used to describe the specific contributions each named author made to a research output. CRediT does not determine authorship — publishers apply separate authorship criteria, such as the four conditions set by the International Committee of Medical Journal Editors (ICMJE), and CRediT is layered on top once authorship has already been agreed.
Each role can be assigned to more than one contributor, and one contributor can hold several roles. Many journals also let you record a degree of contribution — lead, equal, or supporting — alongside each role, which is particularly useful when a supervisor and a PhD student both contributed to the same role in different measures.
For a first-time author, the practical implication is this: a CRediT statement is a factual record, not a courtesy credit. Every role you list should map to work you can actually describe if a co-author, editor, or your own supervisor asks you to justify it.
The 14 CRediT Roles Explained for First-Time Authors
The table below gives the official NISO definition for each role alongside a plain-language example of the kind of task a PhD student, rather than a principal investigator, typically performs under that role.
| CRediT Role | Official Definition (NISO) | Typical PhD-Student Example |
|---|---|---|
| Conceptualization | Ideas; formulation or evolution of overarching research goals and aims. | Proposing a specific sub-question within a supervisor’s wider research programme. |
| Data Curation | Management activities to annotate, scrub, and maintain data for initial and later re-use. | Cleaning and documenting a dataset for deposit in a repository. |
| Formal Analysis | Application of statistical, mathematical, computational, or other formal techniques. | Running the statistical models and interpreting the output. |
| Funding Acquisition | Acquisition of the financial support for the project. | Rarely a student role — usually the supervisor or grant-holder. |
| Investigation | Conducting the research and investigation process, including experiments or data collection. | Running experiments, fieldwork, or interviews. |
| Methodology | Development or design of methodology; creation of models. | Designing the study protocol under supervisory guidance. |
| Project Administration | Management and coordination responsibility for research activity planning and execution. | Coordinating timelines with collaborators or a laboratory. |
| Resources | Provision of study materials, reagents, patients, samples, instrumentation, or tools. | Sourcing samples, reagents, or specialist software licences. |
| Software | Programming, software development, and testing of code. | Writing the analysis scripts or a data-processing pipeline. |
| Supervision | Oversight and leadership responsibility for research activity, including mentorship. | Almost always the PI or supervisor — rarely the PhD student. |
| Validation | Verification of the overall replication or reproducibility of results. | Re-running key analyses to confirm results before submission. |
| Visualization | Preparation of the published work, specifically data visualisation and presentation. | Building the figures and charts for the manuscript. |
| Writing – Original Draft | Preparation of the initial draft, including substantive translation. | Writing the first full draft of the manuscript. |
| Writing – Review & Editing | Critical review, commentary, or revision, including pre- or post-publication stages. | Revising drafts after supervisor and co-author feedback. |
The Most Common CRediT Mistakes First-Time Authors Make
First-time authors tend to make the same handful of errors, and most of them stem from completing the statement alone, at the last minute, without checking definitions against actual tasks performed.
- Over-claiming Conceptualization or Funding Acquisition. If the research question, hypothesis, or grant came from your supervisor’s existing programme, the honest role is more often Investigation, Methodology, or Formal Analysis — not Conceptualization.
- Omitting Supervision entirely. Because the student usually drafts the statement, the supervisor’s oversight and mentorship role is frequently left off. NISO’s definition explicitly covers “mentorship external to the core team” — this is a distinct, real contribution that should be recorded, not assumed.
- Role inflation — listing every role “to be safe”. CRediT exists to make contributions legible, not to maximise how many roles appear next to your name. Claim only roles you can substantiate.
- Conflating CRediT roles with authorship qualification. NISO states plainly that CRediT is not designed to determine authorship; a role in the taxonomy is not equivalent to meeting ICMJE’s four authorship criteria.
- Finalising the statement without co-author sign-off. Wiley’s author guidance places responsibility on the submitting author to ensure all co-authors have reviewed and agreed their roles — skipping this step is a common source of later disputes.
- Confusing the two writing roles. Writing the first full manuscript draft (Writing – Original Draft) is a separate role from revising it after feedback (Writing – Review & Editing); many students default to listing only one.
How to Write Your First CRediT Statement
Use this sequence rather than filling in the statement alone on submission day.
- Map your actual tasks to the 14 definitions first. Work from what you did, not from what would look impressive.
- Draft a preliminary list with a degree of contribution (lead, equal, or supporting) for each role, following the format used by publishers such as Wiley.
- Schedule a dedicated conversation with your supervisor early — ideally when the manuscript is drafted, not at the submission deadline — and explicitly ask whether Supervision should be recorded for them.
- Circulate the full statement to every co-author for review and agreement before submission; the submitting author is responsible for confirming everyone has signed off.
- Reference the definitions, not memory, if there is disagreement. Point to the specific NISO wording for the contested role.
- Escalate unresolved disputes through your institution rather than the journal — publishers typically do not arbitrate authorship or contribution disagreements, a position consistent with COPE’s authorship-dispute guidance.
- Paste the final, agreed statement into your target journal’s Author Contributions section in the format that journal requires.
Common Questions First-Time Authors Ask About CRediT
What are examples of author contributions?
Typical examples include a first author credited for Investigation, Formal Analysis, and Writing – Original Draft, and a supervisor credited for Conceptualization, Funding Acquisition, and Supervision. A lab technician or collaborator might be credited only for Resources or Validation, reflecting a narrower, well-defined contribution.
How do you write an author’s contribution statement?
Map each author’s actual tasks against the 14 CRediT role definitions, note a degree of contribution where the journal allows it, then have every author review and agree the final wording before submission. The statement should describe real work, not seniority or author order.
Where do author contributions go in a manuscript?
Most journals place the CRediT statement in a dedicated “Author Contributions” section, usually just before the Acknowledgements or Funding statement and after the main text. Some journals, including several using the Elsevier and Wiley submission systems, capture it as structured metadata at submission rather than free text.
Does a single-author paper still need a CRediT statement?
Yes — publisher guidance, including Wiley’s, confirms a sole author should still complete a CRediT statement, though they need only list the roles that genuinely apply, since one person rarely performs all 14.
As research assessment moves toward finer-grained recognition of individual contribution — visible in ORCID’s role-linking features and in institutional promotion cases that now cite specific CRediT roles rather than author position alone — an accurate first statement matters beyond a single paper. Treat it as the first entry in a contribution record you will build on throughout your career, not a box to tick before submission.