From the study regulations:
During the period in which they write their thesis, students are affiliated with a main supervisor appointed by the Department of Computer Science. All academic staff with permanent appointments at the Faculty of Science can act as main supervisors. Students can be affiliated with a project supervisor in addition to the main supervisor. The project supervisor can be a member of the academic staff at Aarhus University, another public sector research institution or a private sector research institution/company. In such circumstances, an agreement is drawn up in which the distribution of work between the two supervisors is specified in such a way that the main supervisor ensures that the thesis complies with the applicable norms for theses carried out at the Department of Computer Science. The main supervisor has the formal responsibility for providing academic guidance for the student during the course of writing the thesis, and must take part in the final examination.