The amount of lead time the market will need to make changes to prepare for the single security was one of the concerns discussed at the first advisory group meeting for the single security/common securitization platform.Members, comprised of trade group officials as well as representatives from Fannie Mae, Freddie Mac and Common Securitization Solutions, convened for the first time in mid-July at the CSS office in Bethesda, MD.Operational and technology impacts were discussed, according to notes summarizing the meeting, and most participants agreed that a quick fluid transaction would be best, with conversion to the new security taking place as soon as possible. Most members agreed that the transition could be completed within three or four months but said system changes could take longer.