Why would I be getting negative float on an activity that has different successor links, including one link to an external activity that has positive float. I made a what-if scenario by removing this external project and the negative float in my schedule dissappeared. I cannot make an analysis of the external schedule because I don't have access to see what's in there. One of the things that comes to my mind is that there might be some out-of sequence activities in that external file. Any ideas, comments, suggestions will be highly appreciated. Thanks.