 From October 2013, certain trades under the USA's jurisdiction are mandated to be traded on a particular type of e-trading platform called a Swaps Execution Facility (SEF).Although single name CDS volumes have been in sharp decline with the fall in activity of the structured credit desks, credit indices have remained popular as liquidity in the on-the-run indices remains good and the indices have moved to trading screens to trade more like equity indices.Upon the declaration of a credit event by the ISDA Determinations Committee, the index will be reversioned, and trading in the new index version will commence.