Cas particuliers

Re-enrolment in 4th year of thesis or more

The "normal" duration of a thesis is 3 years. However, a 4th registration (registration in D4) may be granted if duly justified.
Registration in D5 is a derogation and can only be granted in very rare cases. To apply for registration in D5, you must submit all the information required for registration in D4, as well as any documents that explain the reasons for the delay (employer's certificate, medical certificate, etc.). In addition, the letter from your thesis director must justify the reasons for the delay in your thesis work and include a detailed timetable with the foreseeable date of the defence.

The application procedure is the same as for D2 or D3, only the content of the application is different. 

The deadline for re-enrolment applications is 15 June each year.

Registration with the doctoral school is a two-stage process.

Firstly, a single pdf file containing the registration file must be submitted to the ED's internal website: https://dossier-ed.liris.cnrs.fr/
This pdf file must contain all the documents listed below. The name of the pdf file must include your name, the speciality (Computer Science or Mathematics) and the year of registration requested: NameFirstNameSpecialityDn.pdf (e.g. DupontJeanInformatiqueD4.pdf or PainlevéMartinMathématiquesD5.pdf).

Secondly, if you have received a favourable re-registration notice on the https://dossier-ed.liris.cnrs.fr/ website, you must log on to ADUM, submit the same pdf file and send your application for validation. You will then have to wait for successive validations from the ED secretariat, the thesis director, the lab director and the ED director. 

List of documents required for re-registration in 4th year and above:

  • Updated CV.
  • The report of the individual monitoring committee, dated and signed. 
  • Progress report written by the doctoral student.
  • Letter from the thesis director attesting to the progress of the research work and specifying the defence prospects for the following year.
  • Request for exemption drawn up by the thesis director.
  • Proof of funding.
  • Updated Individual Doctoral Training Agreement.
  • Co-supervision agreement (if applicable).
  • Miscellaneous: other information you wish to provide (at your discretion)


In the case of a PhD defence taking place between September and December of the academic year of registration, all these documents may be replaced by your defence dossier (proposal for jury and rapporteurs) signed by the doctoral school.