Except for EU citizens, a valid passport is required for everyone wishing to enter Italy. The visa requirements can be found at http://www.esteri.it/visti/index_eng.asp, and they depends on the country of citizenship. Foreign participants are urged to contact the Italian Embassy or Consulate in their home country as soon as possible, to determine their particular visa requirements and to initiate the application process well in advance of their departure date. If you require a personal letter of invitation to attend the Conference, please contact the 16th ISSS Secretariat by e-mail at the address    and provide a complete mailing address. A signed letter will then be mailed. This letter of invitation does not imply an invited talk or waiver of registration fees.