Good contact and communication when planning a visit allows both parties to clarify goals and expectations of each other, and thus ensure that they actually achieve what was the purpose of the visit.
The host research group have time to make plans for how to include the guest into the work and thus improve the possibility that the group can utilize the guest´s expertise.
The departments with limited office space and facilities available will want to prioritize accepting visitors who already have ties to the researchers at the institute.
If you for various reasons would like to be a visiting researcher here, but do not have any contacts, we can try to help you, but it would be more difficult. Please use the contact form.