These are six week blocks spent in one of the participating laboratories, during which a small project should be completed. The rotations are meant to get newly recruited students to become familiar with the IMPRS and vice versa. Two such rotations are taken consecutively at the start of the thesis and must be in two of the participating institutions. One rotation usually takes place in the lab where the PhD thesis is planned. The group for the second rotation is chosen together with the supervisor so that the interests and skills of the student are complemented. The performance of the student during these rotation periods will be evaluated by the IMPRS faculty based on two reports and one oral presentation.