I understand that an interview, for most schools, is a necessary requirement before admittance, but to what extent does an interview invitation really indicate your chances for acceptance? Is it simply a preliminary cut or does the committee honestly feel that you are a good fit for their program? In other words, is an interview invitation the product of an initial broad screening process or is the interview itself a basic form of screening. The reason for such questions is that I've noticed some schools interview a fairly large number of applicants which would indicate that, too some extent, an invite is not really that big of a deal. Just a few crazy ideas that popped into my head.