Author Order Explained: What First, Second, Middle and Last Author Really Mean

Author order is one of the few things in medical publishing that everyone assumes they understand and almost nobody has read the rules on. It causes more departmental friction than any other part of the process, and in India it also has direct career consequences, because promotion frameworks do not count every position equally.

This article explains what each position conventionally means, what contribution actually justifies it, and how to settle the order before it becomes an argument.

Position by Position

First Author

The first author did the most work on the paper itself. In clinical research this normally means the person who collected the data, performed or directed the analysis, and wrote the first draft. In postgraduate work this is usually the trainee whose project it is.

First authorship carries the most weight nearly everywhere: in promotion frameworks, in fellowship applications and in how the paper is informally cited in conversation as someone name and colleagues. If you are building an academic record, first authorships are what you are building.

Second Author

The second author made the next largest contribution. Typically this is a co investigator who shared data collection, contributed a significant component of the analysis, or substantially reworked the manuscript. In a two person paper the second author is often the supervisor.

Second authorship is a real credential and is recognised by many assessment frameworks, though usually at a lower weight than first.

Third Author and Middle Positions

Middle authors contributed genuinely but at a smaller scale: recruiting a proportion of patients, performing a specific investigation, contributing specialist input to one section, or reviewing the manuscript critically.

Be realistic about what these positions deliver. In many promotion and funding frameworks, middle authorship beyond a defined cut off contributes little or nothing to your record. It still belongs on your CV, and it still carries the full accountability of authorship, which is worth remembering before agreeing to join a paper you have not read closely.

Last Author

The final position conventionally belongs to the senior investigator: the head of the unit, the supervisor, the person who secured funding or conceived the programme of work. In academic medicine, a strong record of last authorships signals that you lead research rather than only participate in it.

This convention is not universal and is not a rule. Some journals and some fields simply list in order of contribution throughout. Say what people did in the contribution statement rather than trusting readers to decode position.

Corresponding Author

The corresponding author is a role, not a rank. They submit the manuscript, communicate with the editorial office, handle proofs, and remain the contact point after publication for queries, data requests and any integrity concerns.

They can be the first author, the last author or anyone in between. It is often the first author in a small clinical study, and the senior author in a large group. Choose someone with a stable institutional email address who will still be reachable in five years, because a corresponding author with a dead address is a genuine problem when queries arrive.

Joint First Authors

Where two people contributed equally, most journals allow shared first authorship, marked with a symbol and a footnote. Agree it before submission. Adding it afterwards needs editorial approval and looks like a dispute being patched up.

One caution: some assessment committees count only the person physically listed first. Shared first authorship is honest, but it may not be valued symmetrically by every reader of your CV.

Describing Contributions Precisely: The CRediT Taxonomy

Many journals now require a contribution statement using the Contributor Roles Taxonomy, which defines fourteen roles: conceptualisation, methodology, software, validation, formal analysis, investigation, resources, data curation, writing the original draft, writing through review and editing, visualisation, supervision, project administration and funding acquisition.

This system is more useful than order, because it says what each person actually did. A statement such as "A B: conceptualisation, investigation, formal analysis, writing the original draft. C D: methodology, supervision, writing through review and editing" tells a reader more than any sequence of names.

It also has a practical benefit. When you assign roles honestly before writing, people who cannot be assigned any role become visible, which is usually the moment a proposed gift authorship quietly disappears.

What Does Not Justify Authorship

The ICMJE is explicit that the following, alone, do not qualify anyone:

• Heading the department or unit where the work was done
• Providing funding or general supervision of the research group
• Collecting data without further contribution
• Providing patients, materials or laboratory access
• Reading the manuscript and saying it looks fine
• Language editing or technical writing assistance

These contributions are real and should be acknowledged. Acknowledgement is the correct location for them.

Deciding the Order Before It Becomes a Fight

Almost every authorship dispute traces back to the same failure: nobody discussed it at the start.

1. Discuss authorship when the protocol is written, not when the draft is finished.
2. Write down the provisional order and each person expected role, and circulate it.
3. State that the order will be revisited if contributions change, because they will.
4. Revisit it honestly before submission using the CRediT roles as the basis.
5. Confirm the final list with everyone in writing before you submit. Journals require every author to approve the submission.

Changing the author list after submission requires editorial approval and a written explanation from all authors, including any being removed. It is slow, awkward and avoidable.

Author Order and Indian Promotion Requirements

For faculty in Indian medical colleges, position is not merely a matter of prestige. The National Medical Commission teaching eligibility framework recognises particular author positions towards the publication requirement, and papers where you sit further down the list may contribute nothing at all towards promotion, however good the journal.

Two practical consequences follow.

First, a strategy of joining many papers in middle positions can produce a long publication list that fails the actual requirement. Fewer papers in qualifying positions serve you better than many in non qualifying ones.

Second, verify the current rules for your specific designation before planning. These regulations are revised periodically, and requirements differ between Assistant Professor, Associate Professor and Professor. Our guide to the NMC publication rules by designation covers this in detail, and the journal must be indexed in a recognised database for the paper to count at all.

A Short Checklist

• Every named author meets all four ICMJE criteria
• Order reflects actual contribution, agreed in advance
• Contribution statement prepared using CRediT roles
• Corresponding author has a durable institutional email
• Non authors acknowledged with their written permission
• Every author has seen and approved the final version
• Positions needed for your promotion requirement confirmed against current rules

Frequently Asked Questions

Which author position counts for NMC promotion?

The National Medical Commission teaching eligibility framework recognises specific author positions rather than any place in the author list, and positions beyond the first few generally do not count towards the publication requirement. Because these regulations are revised periodically and differ by designation, check the current requirement for the post you are applying to before planning your papers, and confirm the journal indexing separately.

Can two people share first authorship?

Yes. Joint or co first authorship is accepted by most journals and is marked with a symbol and a footnote stating that both authors contributed equally. Agree it before submission, because adding it later requires editorial approval. Be aware that some promotion and grant committees count only the person listed first, so a shared position may not be valued equally by every assessor.

Is the last author more senior than the second author?

Usually, in clinical and biomedical research. The last position conventionally belongs to the senior investigator who supervised the work, secured the funding or leads the laboratory. This is convention rather than rule, and it is not universal across disciplines, so state contributions explicitly rather than relying on readers to infer seniority from position.

Can the corresponding author be different from the first author?

Yes, and this is common. The corresponding author handles submission, communication with the editor, and post publication queries. It is often the first author in a small clinical study and often the senior author in a larger group. The role is administrative accountability and does not by itself indicate the largest scientific contribution.

This article is general educational guidance, not legal advice. Journal policies, regulatory rules and institutional requirements change. Always check the current instructions to authors of your target journal and the current guidance of your institution, the NMC and the ICMR before acting.