On May 19, 2005, DOS published a final rule amending the Exchange Visitor Program regulations in two respects: it raised the maximum period of participation for professors and researchers under the program from three to five years, and it instituted a two-year bar on repeat participation. At that time, DOS declared the effective date of the new rule to be the date on which DHS provided notice that it had completed the necessary updates to the Student and Exchange Visitor Information System (SEVIS). On November 1, 2006, DOS announced that SEVIS was now operational and that, accordingly, the 2005 final rule is effective as of November 4, 2006.