Unfortunately, if your application has been sent in a while ago and you still haven't been interviewed, a lot of the reason you haven't heard yet is that your application isn't as competitive as the applicants that have already gotten interviews. Some schools will string you along until the spring until they reject (ie. the Ivy's and some top schools) but others would just like to gauge you against less competitive candidates later in the admissions season....hope this helps...i think i'm in the same situation with some schools..but i guess that's the harsh reality of this impersonal process