- Slovenia is a member of the Schengen area that has no internal borders. Citizens of a number of countries can enter the Schengen area with a valid travel document and without a visa. Regulation (EC) No 539/2001 lists nationals of third countries who are exempt from the visa requirement.
- Upon request, the Organizing Committee will be pleased to send a personal letter of invitation to enable participants to obtain visas for attendance at the 21st ISSS 2015. These invitation letters cannot be considered as an offer of financial support by the ISSS 2015 organizers.