Applicants are ranked at each station by the interviewer or observer. Interviewers do not discuss their rankings with other interviewers, so you are independently rated by each interviewer which eliminates bias.
The evaluation criterion varies each year. The interviewer is provided with a list of criteria that the school is looking for in a candidate. Depending on the school you might be given marks for: demeanor, maturity, intellect, compassion, overall impression, communication, English fluency, ability to organize, integrity in ethics, critical-thinking skills, soft skills identified in the question, incorporating personal examples. You will be rewarded for being methodical and articulate. Interviewers want to see how you process information. You can read McMaster’s Manual for Interviewers online to see an example evaluation form.