Two doctoral students from the same cohort each spent three months in a European lab. The first arrived, was introduced to the group, attended weekly seminars, read widely and came home with good impressions. The second had agreed by email beforehand to learn a specific analytic technique, run it on her own data and draft a manuscript with a group member. That paper later became a thesis chapter.
Time abroad during a PhD can change both your thesis and your career. But its value depends almost entirely on what is decided before you leave. This article compares the formats, discusses timing and lists what needs agreeing.
Four common formats
| Format | Duration | Degree | Administrative load |
|---|---|---|---|
| Short research visit | A few weeks to a few months | Unchanged | Low: invitation letter, visa, insurance |
| Split-site or sandwich study | One or more long periods at a second institution | Usually awarded by the home institution | Medium: agreements on supervision and funding |
| Cotutelle joint supervision | Time divided between two universities as agreed | Joint degree or two degrees | High: a bespoke inter-university agreement |
| Established joint doctoral programme | As designed by the programme | As set by programme rules | Standardised, little negotiation needed |
For most doctoral students, a short visit is the most realistic format and offers the most value per unit of paperwork. Cotutelle makes sense when the project genuinely needs two areas of expertise or two settings and the two sides already collaborate.
Choosing the timing
- Too early, while your questions are still vague: you do not know what you need from the host, and the visit becomes a tour.
- About right, after your proposal is approved, when you have data or specific questions needing a technique, resource or expert your home institution lacks.
- Too late, in the final writing year: new results struggle to make it into the thesis and the trip eats writing time.
Set goals with deliverables
Before you go, write a one-page visit plan and send it to supervisors at both ends. It should answer:
- What specific thing will I learn or do there that I cannot do at home?
- What is the output at the end: an analysed dataset, a manuscript draft, a working experimental protocol?
- Who at the host will work with me directly, and for how many hours a week?
- If there is a joint paper, who will be an author and in what order, based on expected contributions?
The fourth question may feel premature, but a provisional agreement early prevents awkward conversations later.
What to agree for cotutelle and long split-site study
Agreements between the two institutions usually cover:
- Which regulations apply to progress reviews, thesis format and language, and examination panel composition.
- Time spent at each institution and any minimum requirement.
- Fees: where they are paid and whether either side waives them.
- Intellectual property and data: who owns data collected in each country, where it may travel, how it may be published.
- Ethics approval: whether it is needed at both institutions.
- Supervisor roles: who decides which academic matters, and how joint meetings work.
These agreements can take months to pass through two legal or graduate offices. Start early, and do not book flights before the agreement is signed.
Funding: understand the mechanism before hunting amounts
Funding for research mobility usually comes from one of several sources: mobility grants from universities or research funders, project funds held by a supervisor at either end, bilateral cooperation schemes between the institutions, or the host lab itself. Amounts and conditions change from round to round; read official calls carefully and ask your international office which schemes are currently open.
Logistics you cannot skip
- Visa: the type depends on length of stay and whether you will be paid. Check with the consulate and the host’s international office.
- Health insurance valid in the host country for the whole stay.
- Access: IT accounts, library, lab access, mandatory safety training. Some institutions take weeks to set these up, so ask in advance.
- Data you bring: if it includes participants’ personal data, check rules on international data transfer and your ethics approval.
In practice: a six-month plan for a three-month visit
- Six months before: agree the goal and host with your supervisor, who contacts their colleague.
- Five months before: send the one-page visit plan; receive the invitation letter.
- Four to three months before: apply for funding; check ethics and data-transfer requirements.
- Two months before: apply for the visa, buy insurance, find accommodation.
- One month before: request access in advance; prepare the data and materials you need.
- First week there: meet your direct collaborator, reconfirm the end-of-visit output and a weekly meeting slot.
- Last week: send a short report to both supervisors and agree next steps for the joint manuscript.
If you are considering a visit, write the one-page plan with the four questions above now, even before you know where to go. Your answer to the first question will tell you which labs to look for.
Câu hỏi thường gặp
What is a cotutelle PhD?
It is a doctoral thesis jointly supervised and recognised by two universities in two countries, based on a specific agreement between them. Depending on the agreement, the candidate receives a joint degree or two degrees.
When is the best time for a research visit during a PhD?
Usually after your proposal is approved and you know exactly what you need from the host: a technique, a dataset or expert input. Too early and it becomes a sightseeing trip; too late and the results are hard to fit into the thesis.
How are research visits abroad funded?
Through mobility grants from universities or research funders, project funding held by either supervisor, bilateral cooperation schemes between institutions, or the host lab itself. Conditions and amounts change often, so check official pages.
What if my two supervisors in different countries disagree?
Agree from the outset who decides which matters, and hold at least one regular three-way meeting. When disagreements arise, bring both views into one conversation rather than shuttling between them.
Do I need a special visa for a research stay?
Often yes, and the type depends on the length of stay and whether you receive income in the host country. Rules differ between countries, so check with the consulate and the host university’s international office.
