The thing performed by the interview for evaluations best is an interview between an employer and applicants in case of a job interview namely the employment. The purpose of the interview is to judge whether you have a social skill and the intellectual ability that an applicant can meet a job. Similar interview (interview) is subscription for entrance examination and scholarships, but is performed.
In most developed countries, a rule and the rule that what may hear in such an interview are maintained in corporate society. It is said that you should not do a highly personal question and the question irrelevant on work, and the question to be connected for discrimination is similar. It is said that the shortness of around 15 minutes is enough for such an interview (you intend to do whether you are married, or where are you from?), but the interview for a few days exists at longer time, too.
The interview for other evaluations is a thing for psychological evaluations.