Good points Mark, but I should have been more clear that that was my simplistic (and possibly very incorrect) interpretation of what I've heard/read, and I might have it got it completely wrong. I should not have mentioned 'overlapping symptoms', because I can't remember if that's what I actually heard or read. Sorry for the confusion. It sounds like they might be taking quite a sophisticated approach, but we would need to get the detailed information, because I don't know what their exact approach is. Of course, if their starting point is to look at 'CFS' patients, then that also brings a certain amount of baggage with it. That might be what they are doing. I don't know. Everybody please unread the bit where I said 'overlapping symptoms'. I'll correct my previous post. Oh, sorry, I did write a bad post... I'll correct that bit in my previous post as well. I seem to remember reading somewhere, that the CDC were thinking about a name change. And I seem to remember the term 'ME' popping up, so this could potentially mean 'CFS/ME' or 'ME/CFS' or 'ME'. But my memory is notoriously bad, and I may be completely imagining this, and I'm not sure if the CDC have actually mentioned the term 'ME', or someone else did. Sorry! I've corrected my previous post now. Yes, thinking about it, it seems it might be more important that we all get involved with the CDC's process rather than the CFSAC's process, with regards to diagnostic criteria? Or at least get the CFSAC members to get on the CDC's case? We could provide both the CFSAC and the CDC with information. Or lobby the CDC.