In last five days I did three phone interviews for different schools. In all of them, although the interviewers were friendly, they were also very formal. Therefore, I couldn't understand their feeling about the interview (especially since it was by phone).

So, how do you know that you went well in an interview? Interviewers usually give a positive feedback to applicants when the interview goes well? I think I went well, despite some hesitation while talking (english is not my native language), but I'm not sure what to expect ...