§ 23 (1) of the Doctoral Regulations on domestic protection:
A discussion about the PhD thesis should be settled at work. The workplace debate is organised by the supervisor or PhD program leader or a person appointed by him. At least five academically qualified researchers must participate in the workplace debate.
A record of the workplace dispute must be drawn up on a specified form and attached when submitting the PhD thesis.
In extremely justified cases, the holding of a workplace debate may be waived on the proposal of the head of the Doctoral Division with the permission of the President of the University Doctoral Council (UDC).