I was wondering how committees work? Do a certain number of people have to agree to admit a student? What exactly does a chair do, does he get the "last say" or something? I know every school is different but does anyone know in general? Also how about this hypothetical case: You have a very good relationship with the grad admissions committee chair, and he really wants you to work in his lab. Are you pretty much in, or can the other members decide to "block" you for one reason or another?