Hoi, a big piece missing in our table of things that need to be done: PID systematics, especially time-dependence of efficiency and bad (time, detector)-regions. We are affected more or less by these effects depending what normalization we choose. One can turn this around and motivate a particular choice with this argument. I volunteer to assemble the knowledge/stuff for electrons. A first posting by Thorsten is in http://babar-hn.slac.stanford.edu:5090/HyperNews/get/partID/398.html Stefan has posted a study for kaons in http://babar-hn.slac.stanford.edu:5090/HyperNews/get/kanga/478.html Someone of us needs to look at this in the context of our analysis as well. But mainly: Who is volunteering to do this for muons?! Cheers, --U.