Article 15

1. The Board of Deans may, at the request of the supervisor and having consulted the doctoral candidate, appoint one or more co-supervisors. The supervisor shall ascertain that the proposed co-supervisor is prepared to accept such an appointment. The number of supervisors and co-supervisors shall not exceed three for each degree procedures, unless the Board of Deans decides otherwise on the basis of a reasoned request from the Dean.
2. A request as meant in Paragraph 1 may be made to the Board of Deans at any stage of the supervision, by intervention of the Dean, but preferably at the same time as the request referred to in Article 4, Paragraph 3.
3. The co-supervisor has the right to withdraw by means of a reasoned argument in writing to the Board of Deans.

Article 16

Any person who has obtained a doctoral degree and possesses the necessary expertise in the field of science with which the dissertation is concerned, may be appointed as a co-supervisor, as long as he or she has not been actually involved in any part of the research, and is not a professor.

Article 17

1. The co-supervisor shall, in consultation with the supervisor, give guidance with regard to the production of the dissertation.
2. The supervisor shall give the co-supervisor time to give his or her views on the submission of the manuscript for assessment. The co-supervisor shall give his or her decision in writing. The supervisor shall attach this assessment to his/her report on the approval to the doctoral candidate, as referred to in Article 12, Paragraph 4.