Do all accepted students in top-tier engineering programs get invited to interview before getting admitted? I'm an (international) electrical engineering applicant applied to some top-10 graduate programs in US (say, MIT, Caltech, UCB, etc.). As I check the entries of "thegradcafe.com" every day associated with the programs I've applied to, there are many entries which declare interviews with some POIs. So far, I have received no interview requests from any target school. Thus, I'm a little bit both curious about the importance of interview and anxious about the interpretation of such a lack of interviews in my case. To be specific, are all admitted students to top-tier engineering programs invited to interview before getting admitted? In other words, should I expect to be rejected if no one invites me to any sort of interview?

PS. If it helps to clear the situation, I'm currently an M.A.Sc student at a well-known Canadian university. So, both my university and my supervisor are pretty famous to the research community of my field.
Not all graduate programs in the US have (official) interviews at all.  In particular, except for Caltech, I'm not aware of any US computer science graduate programs that regularly interviews applicants before making admissions decisions.

There are a couple of sporadic exceptions, which are almost always handled by phone or skype:


Departments sometimes interview non-domestic students to check for English fluency, especially if their TOEFL (or equivalent) scores are missing or borderline but the application is otherwise strong.
Some individual faculty arrange informal interviews with prospective students before deciding whether to offer funding.


Outside computer science, some US engineering departments do regularly invite PhD students for on-campus interviews before admission, but I think this is more the exception than the rule.  In particular, as far as I know, none of the engineering departments at my university (which is highly ranked in most engineering disciplines) do this.