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What kind of interview is more effective, when the recruiter is friendly, is interested in the candidate, is showing emotions, or when he is keeping distance and carries on a formal conversation?
This is a subject of argues. In my opinion, everything is very individual and while interviewing, a professional HR-specialist, depending on the position, the communication style of the candidate should use a certain method of conducting interviews.
Of course, a formal interview, where specialists are not showing their interest to the candidate and the communication is not transferred to a more friendly way, increases the objectivity of the assessment. But sometimes showing interest to the candidate, asking him how he got there, just being friendly and smiling, will relax the candidate and in such a situation, he will tell you much more than if he is very excited, constrained and thinking about answering each question correctly.
And it will no longer be the true face of the candidate.